$PFG
PRINCIPAL FINANCIAL GROUP INC Stock $pfg

$pfg Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000104746913000940 Filed on February 13, 2013

Income Statement

Concept	2011 Q4	2011 Q3	2011 Q2
Revenue	$2.059B	$2.094B	$2.296B
YoY Change	-14.97%	-10.7%	-1.89%
Cost Of Revenue		$1.115B
YoY Change
Gross Profit		$978.7M
YoY Change
Gross Profit Margin		46.75%
Selling, General & Admin	$51.50M	$52.20M	$52.90M
YoY Change	-6.7%	-1.88%	-3.82%
% of Gross Profit		5.33%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$81.00M	$150.9M	$90.20M
YoY Change	-10.6%	12.95%	-15.31%
% of Gross Profit		15.42%
Operating Expenses	$1.889B	$1.943B	$1.986B
YoY Change	-10.45%	-8.59%	-4.32%
Operating Profit		-$963.8M
YoY Change
Interest Expense
YoY Change
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$170.3M	$151.1M	$310.2M
YoY Change	-35.42%	-7.58%	96.58%
Income Tax	$13.90M	$76.60M	$61.00M
% Of Pretax Income	8.16%	50.69%	19.66%
Net Earnings	$156.4M	$80.10M	$249.2M
YoY Change	-24.66%	-46.74%	75.12%
Net Earnings / Revenue	7.6%	3.83%	10.85%
Basic Earnings Per Share	$0.48	$0.23	$0.68
Diluted Earnings Per Share	$0.48	$0.23	$0.67
COMMON SHARES
Basic Shares Outstanding		311.9M shares
Diluted Shares Outstanding		314.8M shares

Balance Sheet

Concept	2011 Q4	2011 Q3	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$2.834B	$1.434B	$2.170B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$457.2M	$448.0M	$449.0M
YoY Change	-0.39%	-2.82%	-4.87%
Goodwill	$482.3M
YoY Change	39.64%
Intangibles	$890.6M
YoY Change
Long-Term Investments	$827.3M	$65.77B	$64.95B
YoY Change	-98.73%	-0.66%	0.21%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$147.4B	$142.3B	$148.2B
YoY Change	1.92%	-0.81%	8.53%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$105.2M	$74.00M	$108.0M
YoY Change	-2.59%	-43.94%	-14.96%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$108.0M	$77.00M	$111.0M
YoY Change	-5.26%	-43.38%	-14.62%
LONG-TERM LIABILITIES
Long-Term Debt	$1.565B	$1.570B	$1.582B
YoY Change	-1.2%	-0.76%	0.64%
Other Long-Term Liabilities	$6.286B	$6.266B	$5.737B
YoY Change	2.31%	-5.06%	-7.51%
Total Long-Term Liabilities	$7.851B	$7.836B	$7.319B
YoY Change	1.59%	-4.23%	-5.86%
TOTAL LIABILITIES
Total Short-Term Liabilities	$108.0M	$77.00M	$111.0M
Total Long-Term Liabilities	$7.851B	$7.836B	$7.319B
Total Liabilities	$138.0B	$133.0B	$138.5B
YoY Change	1.82%	-0.43%	8.51%
SHAREHOLDERS EQUITY
Retained Earnings	$4.402B
YoY Change
Common Stock	$4.500M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$5.282B
YoY Change
Treasury Stock Shares	149.2M shares
Shareholders Equity	$9.018B	$9.312B	$9.710B
YoY Change
Total Liabilities & Shareholders Equity	$147.4B	$142.3B	$148.2B
YoY Change	1.92%	-0.81%	8.53%

Cashflow Statement

Concept	2011 Q4	2011 Q3	2011 Q2
OPERATING ACTIVITIES
Net Income	$156.4M	$80.10M	$249.2M
YoY Change	-24.66%	-46.74%	75.12%
Depreciation, Depletion And Amortization	$81.00M	$150.9M	$90.20M
YoY Change	-10.6%	12.95%	-15.31%
Cash From Operating Activities	$827.9M	$99.90M	$590.0M
YoY Change	-3.98%	-77.56%	-29.01%
INVESTING ACTIVITIES
Capital Expenditures	-$24.30M	-$14.10M	-$14.40M
YoY Change	140.59%	403.57%	227.27%
Acquisitions
YoY Change
Other Investing Activities	-$88.70M	-$868.9M	$92.40M
YoY Change	-66.94%	-217.15%	176.65%
Cash From Investing Activities	-$113.0M	-$883.0M	$78.00M
YoY Change	-59.41%	-219.5%	168.97%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	684.8M	47.70M	-482.6M
YoY Change	-170.22%	-106.42%	-27.15%
NET CHANGE
Cash From Operating Activities	827.9M	99.90M	590.0M
Cash From Investing Activities	-113.0M	-883.0M	78.00M
Cash From Financing Activities	684.8M	47.70M	-482.6M
Net Change In Cash	1.400B	-735.4M	185.4M
YoY Change	-457.61%	-266.57%	-6.17%
FREE CASH FLOW
Cash From Operating Activities	$827.9M	$99.90M	$590.0M
Capital Expenditures	-$24.30M	-$14.10M	-$14.40M
Free Cash Flow	$852.2M	$114.0M	$604.4M
YoY Change	-2.3%	-74.55%	-27.66%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012	pfg	Net Gain Loss Excluding Available For Sale Impairments NetGainLossExcludingAvailableForSaleImpairments	232700000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	464200000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	543400000	USD
CY2012Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	927200000	USD
CY2012Q4	us-gaap	Separate Account Assets SeparateAccountAssets	81653800000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	1006800000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	827300000	USD
CY2011Q4	pfg	Other Investments Other OtherInvestmentsOther	2158500000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	4500000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	9730900000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	4940200000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	631900000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	5554400000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	20000000	USD
CY2012Q4	us-gaap	Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense	22436200000	USD
CY2012Q4	us-gaap	Other Policyholder Funds OtherPolicyholderFunds	716400000	USD
CY2012Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	15300000	USD
CY2012Q4	us-gaap	Separate Accounts Liability SeparateAccountsLiability	81653800000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	6146100000	USD
CY2012Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	626700000	USD
CY2012Q4	us-gaap	Available For Sale Securities Equity Securities AvailableForSaleSecuritiesEquitySecurities	136500000	USD
CY2012Q4	us-gaap	Trading Securities Equity TradingSecuritiesEquity	252800000	USD
CY2012Q4	us-gaap	Real Estate Investments RealEstateInvestments	1180300000	USD
CY2012Q4	us-gaap	Equity Method Investments EquityMethodInvestments	869000000	USD
CY2012Q4	pfg	Other Investments Other OtherInvestmentsOther	2422100000	USD
CY2012Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	584400000	USD
CY2012Q4	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	1084400000	USD
CY2012	pfg	Net Impairment Losses On Available For Sale Securities NetImpairmentLossesOnAvailableForSaleSecurities	118600000	USD
CY2012	us-gaap	Policyholder Dividends PolicyholderDividends	197700000	USD
CY2012	pfg	Operating Expenses Including Deferred Acquisition Costs Capitalization And Amortization OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization	2934100000	USD
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.14	pure
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1199800000	USD
CY2011	pfg	Net Impairment Losses On Available For Sale Securities NetImpairmentLossesOnAvailableForSaleSecurities	197300000	USD
CY2010	pfg	Net Impairment Losses On Available For Sale Securities NetImpairmentLossesOnAvailableForSaleSecurities	240200000	USD
CY2012	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	8263900000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1303700000	USD
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	6647500000	USD
CY2012	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	2538400000	USD
CY2012	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	1668000000	USD
CY2012	us-gaap	Payments To Acquire Real Estate Held For Investment PaymentsToAcquireRealEstateHeldForInvestment	151800000	USD
CY2012	pfg	Payments To Acquire Property Plant And Equipment Net PaymentsToAcquirePropertyPlantAndEquipmentNet	38900000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	157200000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	28900000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	272700000	USD
CY2012	us-gaap	Proceeds From Derivative Instrument Financing Activities ProceedsFromDerivativeInstrumentFinancingActivities	51800000	USD
CY2012	us-gaap	Payments For Derivative Instrument Financing Activities PaymentsForDerivativeInstrumentFinancingActivities	49900000	USD
CY2012	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	10800000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	231300000	USD
CY2012	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	33000000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1493400000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	450600000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-68800000	USD
CY2012	us-gaap	Additions To Contract Holders Funds AdditionsToContractHoldersFunds	6900400000	USD
CY2012	us-gaap	Withdrawal From Contract Holders Funds WithdrawalFromContractHoldersFunds	7522600000	USD
CY2012	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	32000000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-14600000	USD
CY2012	us-gaap	Fees And Commissions FeesAndCommissions	2626700000	USD
CY2012Q4	pfg	Other Investments As Defined OtherInvestmentsAsDefined	3291100000	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	PRINCIPAL FINANCIAL GROUP INC
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001126328
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2011Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	49006700000	USD
CY2011Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	971700000	USD
CY2011Q4	us-gaap	Available For Sale Securities Equity Securities AvailableForSaleSecuritiesEquitySecurities	77100000	USD
CY2011Q4	us-gaap	Trading Securities Equity TradingSecuritiesEquity	404800000	USD
CY2011Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	10727200000	USD
CY2011Q4	us-gaap	Real Estate Investments RealEstateInvestments	1092900000	USD
CY2011Q4	pfg	Other Investments As Defined OtherInvestmentsAsDefined	2985800000	USD
CY2011Q4	us-gaap	Investments Investments	66151300000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2833900000	USD
CY2011Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	615200000	USD
CY2011Q4	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	1196500000	USD
CY2011Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	2428000000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	457200000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	482300000	USD
CY2011Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	890600000	USD
CY2011Q4	us-gaap	Separate Account Assets SeparateAccountAssets	71364400000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	942300000	USD
CY2011Q4	us-gaap	Assets Assets	147361700000	USD
CY2011Q4	pfg	Contractholder Funds ContractholderFunds	37676400000	USD
CY2011Q4	us-gaap	Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense	20210400000	USD
CY2011Q4	us-gaap	Other Policyholder Funds OtherPolicyholderFunds	548600000	USD
CY2011Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	105200000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	1564800000	USD
CY2011Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	3100000	USD
CY2011Q4	us-gaap	Separate Accounts Liability SeparateAccountsLiability	71364400000	USD
CY2011Q4	us-gaap	Other Liabilities OtherLiabilities	6286200000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	137967800000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	4500000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	9634700000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	4402300000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	258000000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	5281700000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	9017900000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	353800000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9371700000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	147361700000	USD
CY2012Q4	us-gaap	Assets Assets	161926500000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	152092900000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9773200000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	161926500000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	9753200000	USD
CY2012Q4	us-gaap	Investments Investments	68811300000	USD
CY2011Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	22200000	USD
CY2011Q4	pfg	Other Investments Fair Value Option OtherInvestmentsFairValueOption	97500000	USD
CY2012Q4	pfg	Other Investments Fair Value Option OtherInvestmentsFairValueOption	113900000	USD
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2500000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	450300000	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	301100000	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	149200000	shares
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2500000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	453500000	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	293800000	shares
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	159700000	shares
CY2011	us-gaap	Premiums Earned Net PremiumsEarnedNet	2891000000	USD
CY2011	us-gaap	Fees And Commissions FeesAndCommissions	2526700000	USD
CY2011	us-gaap	Net Investment Income NetInvestmentIncome	3375300000	USD
CY2011	pfg	Net Gain Loss Excluding Available For Sale Impairments NetGainLossExcludingAvailableForSaleImpairments	75000000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	147600000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	49700000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	197300000	USD
CY2011	us-gaap	Gain Loss On Investments GainLossOnInvestments	-122300000	USD
CY2011	us-gaap	Revenues Revenues	8670700000	USD
CY2011	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	4616600000	USD
CY2011	us-gaap	Policyholder Dividends PolicyholderDividends	210200000	USD
CY2011	pfg	Operating Expenses Including Deferred Acquisition Costs Capitalization And Amortization OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization	2950800000	USD
CY2011	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	7777600000	USD
CY2011	pfg	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	893100000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	688900000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	36200000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	652700000	USD
CY2011	us-gaap	Dividends Preferred Stock DividendsPreferredStock	33000000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	619700000	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.97
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.95
CY2010	us-gaap	Premiums Earned Net PremiumsEarnedNet	3555500000	USD
CY2010	us-gaap	Fees And Commissions FeesAndCommissions	2337100000	USD
CY2010	us-gaap	Net Investment Income NetInvestmentIncome	3495800000	USD
CY2010	pfg	Net Gain Loss Excluding Available For Sale Impairments NetGainLossExcludingAvailableForSaleImpairments	50000000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	296300000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	-56100000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	240200000	USD
CY2010	us-gaap	Gain Loss On Investments GainLossOnInvestments	-190200000	USD
CY2010	us-gaap	Revenues Revenues	9198200000	USD
CY2010	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	5204300000	USD
CY2010	us-gaap	Policyholder Dividends PolicyholderDividends	219900000	USD
CY2010	pfg	Operating Expenses Including Deferred Acquisition Costs Capitalization And Amortization OperatingExpensesIncludingDeferredAcquisitionCostsCapitalizationAndAmortization	2988300000	USD
CY2010	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	8412500000	USD
CY2010	pfg	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	785700000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	104900000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	680800000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	17900000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	662900000	USD
CY2010	us-gaap	Dividends Preferred Stock DividendsPreferredStock	33000000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	629900000	USD
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.97
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.95
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	118600000	USD
CY2012	us-gaap	Gain Loss On Investments GainLossOnInvestments	114100000	USD
CY2012	us-gaap	Revenues Revenues	9215100000	USD
CY2012	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	8255700000	USD
CY2012	pfg	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	959400000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	824700000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	805900000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	772900000	USD
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.60
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.57
CY2011	pfg	Other Comprehensive Income Available For Sale Securities Period Increase Decrease Net Of Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseNetOfTax	208600000	USD
CY2011	pfg	Other Comprehensive Income Reclassification Adjustment Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax	-31000000	USD
CY2011	pfg	Other Comprehensive Income Derivatives Period Increase Decrease Net Of Tax OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseNetOfTax	23600000	USD
CY2010	pfg	Other Comprehensive Income Reclassification Adjustment Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax	33700000	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-139500000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	172900000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-49200000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	639700000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	35700000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	604000000	USD
CY2010	pfg	Other Comprehensive Income Available For Sale Securities Period Increase Decrease Net Of Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseNetOfTax	1113500000	USD
CY2010	pfg	Other Comprehensive Income Derivatives Period Increase Decrease Net Of Tax OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseNetOfTax	12900000	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	31900000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-208000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1332600000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	2013400000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	18100000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1995300000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	375100000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7420000000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9306400000	USD
CY2010	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	20600000	USD
CY2010	pfg	Share Based Compensation Including Tax Effect ShareBasedCompensationIncludingTaxEffect	48000000	USD
CY2010	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2600000	USD
CY2010	us-gaap	Dividends Common Stock DividendsCommonStock	176200000	USD
CY2010	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	7800000	USD
CY2010	us-gaap	Minority Interest Increase From Stock Issuance MinorityInterestIncreaseFromStockIssuance	24000000	USD
CY2010	pfg	Profit Loss Excluding Redeemable Noncontrolling Interest ProfitLossExcludingRedeemableNoncontrollingInterest	680800000	USD
CY2010	pfg	Other Comprehensive Income Loss Net Of Tax Excluding Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxExcludingRedeemableNoncontrollingInterest	1332600000	USD
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	25900000	USD
CY2011	pfg	Share Based Compensation Including Tax Effect ShareBasedCompensationIncludingTaxEffect	43900000	USD
CY2011	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	556400000	USD
CY2011	us-gaap	Dividends Common Stock DividendsCommonStock	213700000	USD
CY2011	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	9800000	USD
CY2011	us-gaap	Minority Interest Increase From Stock Issuance MinorityInterestIncreaseFromStockIssuance	174600000	USD
CY2011	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	5700000	USD
CY2011	pfg	Profit Loss Excluding Redeemable Noncontrolling Interest ProfitLossExcludingRedeemableNoncontrollingInterest	688700000	USD
CY2011	pfg	Other Comprehensive Income Loss Net Of Tax Excluding Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxExcludingRedeemableNoncontrollingInterest	-49200000	USD
CY2012	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	1900000	USD
CY2012	pfg	Other Comprehensive Income Loss Attributable To Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossAttributableToRedeemableNoncontrollingInterest	1100000	USD
CY2011	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	260300000	USD
CY2010	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	268700000	USD
CY2011	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	-349600000	USD
CY2010	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	-329700000	USD
CY2011	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	-50900000	USD
CY2010	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	-25800000	USD
CY2011	us-gaap	Proceeds From Payments For Trading Securities ProceedsFromPaymentsForTradingSecurities	110800000	USD
CY2010	us-gaap	Proceeds From Payments For Trading Securities ProceedsFromPaymentsForTradingSecurities	188300000	USD
CY2011	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	130200000	USD
CY2010	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	102300000	USD
CY2011	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	1201400000	USD
CY2010	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	1303900000	USD
CY2011	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	20400000	USD
CY2010	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	41200000	USD
CY2011	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	115800000	USD
CY2010	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	164700000	USD
CY2011	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	132300000	USD
CY2010	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	60600000	USD
CY2011	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	82000000	USD
CY2010	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	61200000	USD
CY2011	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	141800000	USD
CY2010	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	121600000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	43400000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	47600000	USD
CY2011	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-524800000	USD
CY2010	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-190300000	USD
CY2011	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	2024400000	USD
CY2010	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	2110900000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	2713300000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	2791700000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	3080900000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	6742400000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	7187900000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	980700000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1684600000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	5760800000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	5161300000	USD
CY2011	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	1484900000	USD
CY2010	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	1272000000	USD
CY2011	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	1793100000	USD
CY2010	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	1798000000	USD
CY2011	us-gaap	Payments To Acquire Real Estate Held For Investment PaymentsToAcquireRealEstateHeldForInvestment	129900000	USD
CY2010	us-gaap	Payments To Acquire Real Estate Held For Investment PaymentsToAcquireRealEstateHeldForInvestment	53800000	USD
CY2011	pfg	Payments To Acquire Property Plant And Equipment Net PaymentsToAcquirePropertyPlantAndEquipmentNet	56900000	USD
CY2010	pfg	Payments To Acquire Property Plant And Equipment Net PaymentsToAcquirePropertyPlantAndEquipmentNet	21500000	USD
CY2012	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	80400000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	52100000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	81200000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1611400000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-202100000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	27500000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	25900000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	20600000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	556400000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2600000	USD
CY2011	us-gaap	Proceeds From Derivative Instrument Financing Activities ProceedsFromDerivativeInstrumentFinancingActivities	75900000	USD
CY2010	us-gaap	Proceeds From Derivative Instrument Financing Activities ProceedsFromDerivativeInstrumentFinancingActivities	79300000	USD
CY2011	us-gaap	Payments For Derivative Instrument Financing Activities PaymentsForDerivativeInstrumentFinancingActivities	46500000	USD
CY2010	us-gaap	Payments For Derivative Instrument Financing Activities PaymentsForDerivativeInstrumentFinancingActivities	46500000	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	2000000	USD
CY2010	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	1000000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	213700000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	176200000	USD
CY2011	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	33000000	USD
CY2010	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	33000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2300000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	12200000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	11100000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	3200000	USD
CY2010	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	1700000	USD
CY2011	us-gaap	Additions To Contract Holders Funds AdditionsToContractHoldersFunds	6302100000	USD
CY2010	us-gaap	Additions To Contract Holders Funds AdditionsToContractHoldersFunds	4283800000	USD
CY2011	us-gaap	Withdrawal From Contract Holders Funds WithdrawalFromContractHoldersFunds	7079000000	USD
CY2010	us-gaap	Withdrawal From Contract Holders Funds WithdrawalFromContractHoldersFunds	7343400000	USD
CY2011	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-18500000	USD
CY2010	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	46200000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4500000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4300000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-1554700000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-3182200000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-126200000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1343300000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	956500000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-363000000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1877400000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2240400000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4177200000	USD
CY2011	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Assumed From Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountAssumedFromOtherCompanies	3000000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Assumed From Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountAssumedFromOtherCompanies	3500000	USD
CY2012Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	87000000	USD
CY2011Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	44800000	USD
CY2012Q4	us-gaap	Participating Policies As Percentage Of Gross Insurance In Force ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce	0.13	pure
CY2011Q4	us-gaap	Participating Policies As Percentage Of Gross Insurance In Force ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce	0.15	pure
CY2010Q4	us-gaap	Participating Policies As Percentage Of Gross Insurance In Force ParticipatingPoliciesAsPercentageOfGrossInsuranceInForce	0.16	pure
CY2012Q4	pfg	Participating Policies As Percentage Of Number Of Life Insurance Policies In Force ParticipatingPoliciesAsPercentageOfNumberOfLifeInsurancePoliciesInForce	0.47	pure
CY2011Q4	pfg	Participating Policies As Percentage Of Number Of Life Insurance Policies In Force ParticipatingPoliciesAsPercentageOfNumberOfLifeInsurancePoliciesInForce	0.50	pure
CY2010Q4	pfg	Participating Policies As Percentage Of Number Of Life Insurance Policies In Force ParticipatingPoliciesAsPercentageOfNumberOfLifeInsurancePoliciesInForce	0.53	pure
CY2012	pfg	Participating Policies As Percentage Of Life Insurance Premiums ParticipatingPoliciesAsPercentageOfLifeInsurancePremiums	0.43	pure
CY2011	pfg	Participating Policies As Percentage Of Life Insurance Premiums ParticipatingPoliciesAsPercentageOfLifeInsurancePremiums	0.47	pure
CY2010	pfg	Participating Policies As Percentage Of Life Insurance Premiums ParticipatingPoliciesAsPercentageOfLifeInsurancePremiums	0.49	pure
CY2012Q4	pfg	Third Party Reinsurer Entity Maximum Exposure Amount Of Life Insurance In Force ThirdPartyReinsurerEntityMaximumExposureAmountOfLifeInsuranceInForce	29700000000	USD
CY2011Q4	pfg	Third Party Reinsurer Entity Maximum Exposure Amount Of Life Insurance In Force ThirdPartyReinsurerEntityMaximumExposureAmountOfLifeInsuranceInForce	25300000000	USD
CY2012Q4	pfg	Third Party Reinsurer Entity Maximum Exposure As Percentage Of Life Insurance In Force ThirdPartyReinsurerEntityMaximumExposureAsPercentageOfLifeInsuranceInForce	0.18	pure
CY2011Q4	pfg	Third Party Reinsurer Entity Maximum Exposure As Percentage Of Life Insurance In Force ThirdPartyReinsurerEntityMaximumExposureAsPercentageOfLifeInsuranceInForce	0.16	pure
CY2012Q4	pfg	Third Party Reinsurer Entity Exposure Amount Limited To Reinsurance Recoverable ThirdPartyReinsurerEntityExposureAmountLimitedToReinsuranceRecoverable	26100000	USD
CY2011Q4	pfg	Third Party Reinsurer Entity Exposure Amount Limited To Reinsurance Recoverable ThirdPartyReinsurerEntityExposureAmountLimitedToReinsuranceRecoverable	22600000	USD
CY2012	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	3554100000	USD
CY2011	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	3205600000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	3859800000	USD
CY2012	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Assumed From Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountAssumedFromOtherCompanies	2600000	USD
CY2012	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Ceded To Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountCededToOtherCompanies	337300000	USD
CY2011	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Ceded To Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountCededToOtherCompanies	317600000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Ceded To Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountCededToOtherCompanies	307800000	USD
CY2012	us-gaap	Premiums Earned Net PremiumsEarnedNet	3219400000	USD
CY2012	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	5268600000	USD
CY2011	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	4926500000	USD
CY2010	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	5471800000	USD
CY2012	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	33900000	USD
CY2011	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	34000000	USD
CY2010	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	36900000	USD
CY2012	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	178600000	USD
CY2011	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	343900000	USD
CY2010	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	304400000	USD
CY2012	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	5123900000	USD
CY2012Q4	pfg	Separate Account With Shares Of Principal Financial Group Stock SeparateAccountWithSharesOfPrincipalFinancialGroupStock	148300000	USD
CY2011Q4	pfg	Separate Account With Shares Of Principal Financial Group Stock SeparateAccountWithSharesOfPrincipalFinancialGroupStock	146500000	USD
CY2010	pfg	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSoldChangeInStatus	53200000	USD
CY2010	pfg	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Reclassified To Trading OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesReclassifiedToTrading	44400000	USD
CY2010	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	3500000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost	47715300000	USD
CY2011	pfg	Other Realized Gain Loss OtherRealizedGainLoss	142500000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	345400000	USD
CY2011	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	154200000	USD
CY2012	pfg	Finite Lived Intangible Assets Weighted Average Remaining Expected Life FiniteLivedIntangibleAssetsWeightedAverageRemainingExpectedLife	P13Y
CY2012Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	449600000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	410600000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	217700000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	187200000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	231900000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	223400000	USD
CY2012Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	695300000	USD
CY2011Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	667200000	USD
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	293402246	shares
CY2012Q2	dei	Entity Public Float EntityPublicFloat	7754473315	USD
CY2011Q4	pfg	Total Assets Unconsolidated Money Market Mutual Fund Variable Interest Entities TotalAssetsUnconsolidatedMoneyMarketMutualFundVariableInterestEntities	1700000000	USD
CY2012Q4	pfg	Total Assets Unconsolidated Money Market Mutual Fund Variable Interest Entities TotalAssetsUnconsolidatedMoneyMarketMutualFundVariableInterestEntities	1500000000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	3564200000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	12644400000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	8944900000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	11258600000	USD
CY2012Q4	pfg	Available For Sale Securities Debt Maturities With Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithSingleMaturityDateAmortizedCost	36412100000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	11303200000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	3619000000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	13356400000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	10023200000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	12658200000	USD
CY2012Q4	pfg	Available For Sale Securities Debt Maturities With Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithSingleMaturityDateFairValue	39656800000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	11282500000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	50939300000	USD
CY2011	pfg	Gross Investment Income Loss GrossInvestmentIncomeLoss	3458300000	USD
CY2011	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	83000000	USD
CY2010	pfg	Gross Investment Income Loss GrossInvestmentIncomeLoss	3585300000	USD
CY2010	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	89500000	USD
CY2012	pfg	Gross Investment Income Loss GrossInvestmentIncomeLoss	3336100000	USD
CY2012	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	81200000	USD
CY2012	us-gaap	Net Investment Income NetInvestmentIncome	3254900000	USD
CY2011	pfg	Available For Sale Debt Securities Gross Realized Gain AvailableForSaleDebtSecuritiesGrossRealizedGain	26400000	USD
CY2011	pfg	Available For Sale Debt Securities Gross Realized Loss AvailableForSaleDebtSecuritiesGrossRealizedLoss	158800000	USD
CY2011	pfg	Available For Sale Debt Securities Hedging Net AvailableForSaleDebtSecuritiesHedgingNet	130500000	USD
CY2011	pfg	Trading Debt Securities Realized Gain Loss TradingDebtSecuritiesRealizedGainLoss	-6700000	USD
CY2011	pfg	Available For Sale Equity Securities Gross Realized Gain AvailableForSaleEquitySecuritiesGrossRealizedGain	2200000	USD
CY2011	pfg	Available For Sale Equity Securities Gross Realized Loss AvailableForSaleEquitySecuritiesGrossRealizedLoss	6400000	USD
CY2011	pfg	Trading Equity Securities Realized Gain Loss TradingEquitySecuritiesRealizedGainLoss	20300000	USD
CY2011	pfg	Mortgage Loan Realized Gain Loss MortgageLoanRealizedGainLoss	-42100000	USD
CY2011	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-180500000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	900000000	USD
CY2010	pfg	Available For Sale Debt Securities Gross Realized Gain AvailableForSaleDebtSecuritiesGrossRealizedGain	63700000	USD
CY2010	pfg	Available For Sale Debt Securities Gross Realized Loss AvailableForSaleDebtSecuritiesGrossRealizedLoss	339900000	USD
CY2010	pfg	Available For Sale Debt Securities Hedging Net AvailableForSaleDebtSecuritiesHedgingNet	142200000	USD
CY2010	pfg	Trading Debt Securities Realized Gain Loss TradingDebtSecuritiesRealizedGainLoss	17500000	USD
CY2010	pfg	Available For Sale Equity Securities Gross Realized Gain AvailableForSaleEquitySecuritiesGrossRealizedGain	8900000	USD
CY2010	pfg	Available For Sale Equity Securities Gross Realized Loss AvailableForSaleEquitySecuritiesGrossRealizedLoss	3200000	USD
CY2010	pfg	Trading Equity Securities Realized Gain Loss TradingEquitySecuritiesRealizedGainLoss	27700000	USD
CY2010	pfg	Mortgage Loan Realized Gain Loss MortgageLoanRealizedGainLoss	-152200000	USD
CY2010	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-143900000	USD
CY2010	pfg	Other Realized Gain Loss OtherRealizedGainLoss	132900000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	1600000000	USD
CY2012	pfg	Available For Sale Debt Securities Gross Realized Gain AvailableForSaleDebtSecuritiesGrossRealizedGain	31000000	USD
CY2012	pfg	Available For Sale Debt Securities Gross Realized Loss AvailableForSaleDebtSecuritiesGrossRealizedLoss	144900000	USD
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	-17300000	USD
CY2012	pfg	Available For Sale Debt Securities Hedging Net AvailableForSaleDebtSecuritiesHedgingNet	-27500000	USD
CY2012	pfg	Trading Debt Securities Realized Gain Loss TradingDebtSecuritiesRealizedGainLoss	2200000	USD
CY2012	pfg	Available For Sale Equity Securities Gross Realized Gain AvailableForSaleEquitySecuritiesGrossRealizedGain	600000	USD
CY2012	pfg	Available For Sale Equity Securities Gross Realized Loss AvailableForSaleEquitySecuritiesGrossRealizedLoss	900000	USD
CY2012	pfg	Trading Equity Securities Realized Gain Loss TradingEquitySecuritiesRealizedGainLoss	34100000	USD
CY2012	pfg	Mortgage Loan Realized Gain Loss MortgageLoanRealizedGainLoss	-51300000	USD
CY2012	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-10900000	USD
CY2012	pfg	Other Realized Gain Loss OtherRealizedGainLoss	264400000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	1200000000	USD
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	135900000	USD
CY2010	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	112400000	USD
CY2010	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	109700000	USD
CY2011Q4	pfg	Adjustments Assumed Changes Amortization Patterns AdjustmentsAssumedChangesAmortizationPatterns	-376100000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	19500000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	82600000	USD
CY2011Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	141400000	USD
CY2011	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	37800000	USD
CY2011Q4	pfg	Adjustments Assumed Changes Liability For Policyholder Benefits And Claims AdjustmentsAssumedChangesLiabilityForPolicyholderBenefitsAndClaims	-442700000	USD
CY2011Q4	pfg	Net Unrealized Gains Losses Derivative Instruments NetUnrealizedGainsLossesDerivativeInstruments	113200000	USD
CY2011Q4	pfg	Net Unrealized Gains Losses Equity Method Subsidiaries And Noncontrolling Interest Adjustments NetUnrealizedGainsLossesEquityMethodSubsidiariesAndNoncontrollingInterestAdjustments	150300000	USD
CY2011Q4	pfg	Provision Deferred Income Tax Benefits Expense ProvisionDeferredIncomeTaxBenefitsExpense	-354100000	USD
CY2011Q4	pfg	Net Unrealized Gains Losses Available For Sale Securities And Derivative Instruments NetUnrealizedGainsLossesAvailableForSaleSecuritiesAndDerivativeInstruments	728400000	USD
CY2012Q4	pfg	Net Unrealized Gains Losses Debt Securities Available For Sale Securities NetUnrealizedGainsLossesDebtSecuritiesAvailableForSaleSecurities	3562500000	USD
CY2012Q4	pfg	Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Available For Sale Debt Securities AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossAvailableForSaleDebtSecurities	-302000000	USD
CY2012Q4	pfg	Net Unrealized Gains Losses Equity Securities Available For Sale NetUnrealizedGainsLossesEquitySecuritiesAvailableForSale	4100000	USD
CY2012Q4	pfg	Adjustments Assumed Changes Amortization Patterns AdjustmentsAssumedChangesAmortizationPatterns	-515200000	USD
CY2011	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3300000	USD
CY2011	pfg	Financing Receivable Allowance For Credit Losses Translation Adjustment FinancingReceivableAllowanceForCreditLossesTranslationAdjustment	-200000	USD
CY2011	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	135600000	USD
CY2011	pfg	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSoldChangeInStatus	68200000	USD
CY2011	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	-3900000	USD
CY2012	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	20700000	USD
CY2012	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	80000000	USD
CY2012	pfg	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSoldChangeInStatus	191900000	USD
CY2012	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	8400000	USD
CY2009Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	204700000	USD
CY2010Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	325700000	USD
CY2011Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	434800000	USD
CY2012Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	335200000	USD
CY2011Q4	pfg	Net Unrealized Gains Losses Debt Securities Available For Sale Securities NetUnrealizedGainsLossesDebtSecuritiesAvailableForSaleSecurities	1920600000	USD
CY2011Q4	pfg	Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Available For Sale Debt Securities AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossAvailableForSaleDebtSecurities	-284700000	USD
CY2011Q4	pfg	Net Unrealized Gains Losses Equity Securities Available For Sale NetUnrealizedGainsLossesEquitySecuritiesAvailableForSale	1900000	USD
CY2012Q4	pfg	Adjustments Assumed Changes Liability For Policyholder Benefits And Claims AdjustmentsAssumedChangesLiabilityForPolicyholderBenefitsAndClaims	-1198700000	USD
CY2012Q4	pfg	Net Unrealized Gains Losses Derivative Instruments NetUnrealizedGainsLossesDerivativeInstruments	90700000	USD
CY2012Q4	pfg	Net Unrealized Gains Losses Equity Method Subsidiaries And Noncontrolling Interest Adjustments NetUnrealizedGainsLossesEquityMethodSubsidiariesAndNoncontrollingInterestAdjustments	191300000	USD
CY2012Q4	pfg	Provision Deferred Income Tax Benefits Expense ProvisionDeferredIncomeTaxBenefitsExpense	-597000000	USD
CY2012Q4	pfg	Net Unrealized Gains Losses Available For Sale Securities And Derivative Instruments NetUnrealizedGainsLossesAvailableForSaleSecuritiesAndDerivativeInstruments	1235700000	USD
CY2011Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	10829300000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	102100000	USD
CY2011Q4	us-gaap	Notes Receivable Net NotesReceivableNet	10727200000	USD
CY2012Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	11617100000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	97400000	USD
CY2012Q4	us-gaap	Notes Receivable Net NotesReceivableNet	11519700000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	75700000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	85000000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	13000000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	50900000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	148900000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment1 To29 Days Past Due FinancingReceivableRecordedInvestment1To29DaysPastDue	10680400000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	7500000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	80800000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	60800000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	21600000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	23700000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	106100000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment1 To29 Days Past Due FinancingReceivableRecordedInvestment1To29DaysPastDue	11511000000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	8100000	USD
CY2011	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-44200000	USD
CY2011	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	66300000	USD
CY2012Q4	pfg	Assets Designated To Closed Block Total Investments AssetsDesignatedToClosedBlockTotalInvestments	4300500000	USD
CY2012Q4	us-gaap	Assets Designated To Closed Block Cash And Cash Equivalents AssetsDesignatedToClosedBlockCashAndCashEquivalents	51300000	USD
CY2012Q4	pfg	Assets Designated To Closed Block Accrued Investment Income AssetsDesignatedToClosedBlockAccruedInvestmentIncome	52500000	USD
CY2012Q4	pfg	Assets Designated To Closed Block Premiums Due And Other Receivables AssetsDesignatedToClosedBlockPremiumsDueAndOtherReceivables	13200000	USD
CY2012Q4	pfg	Assets Designated To Closed Block Deferred Income Tax Asset AssetsDesignatedToClosedBlockDeferredIncomeTaxAsset	39200000	USD
CY2012Q4	us-gaap	Assets Designated To Closed Block AssetsDesignatedToClosedBlock	4456700000	USD
CY2011Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	10687900000	USD
CY2010	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-152900000	USD
CY2010	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	195700000	USD
CY2010	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1100000	USD
CY2010	pfg	Financing Receivable Allowance For Credit Losses Translation Adjustment FinancingReceivableAllowanceForCreditLossesTranslationAdjustment	200000	USD
CY2010Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	121100000	USD
CY2010Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	14400000	USD
CY2010Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	106700000	USD
CY2010Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	51300000	USD
CY2010Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	11194900000	USD
CY2010Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	11246200000	USD
CY2012	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-53200000	USD
CY2012	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	61800000	USD
CY2012	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3800000	USD
CY2012	pfg	Financing Receivable Allowance For Credit Losses Translation Adjustment FinancingReceivableAllowanceForCreditLossesTranslationAdjustment	100000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	12800000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	84600000	USD
CY2012Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	53300000	USD
CY2012Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	11563800000	USD
CY2009Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	162600000	USD
CY2012	pfg	Financing Receivable Td Rs Number Of Contracts FinancingReceivableTDRsNumberOfContracts	338	item
CY2012	pfg	Financing Receivable Td Rs Recorded Investment FinancingReceivableTDRsRecordedInvestment	35100000	USD
CY2012	pfg	Financing Receivable Modifications Payment Default Number Of Loans FinancingReceivableModificationsPaymentDefaultNumberOfLoans	13	item
CY2012	pfg	Financing Receivable Modifications Payment Default Recorded Investment FinancingReceivableModificationsPaymentDefaultRecordedInvestment	13700000	USD
CY2011	pfg	Financing Receivable Td Rs Number Of Contracts FinancingReceivableTDRsNumberOfContracts	159	item
CY2011	pfg	Financing Receivable Td Rs Recorded Investment FinancingReceivableTDRsRecordedInvestment	13900000	USD
CY2011	pfg	Financing Receivable Modifications Payment Default Number Of Loans FinancingReceivableModificationsPaymentDefaultNumberOfLoans	8	item
CY2011	pfg	Financing Receivable Modifications Payment Default Recorded Investment FinancingReceivableModificationsPaymentDefaultRecordedInvestment	4700000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	45100000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	41400000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	41100000	USD
CY2012Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	332800000	USD
CY2011Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	361800000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	46036200000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilities	38080900000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity EquityMethodInvestmentSummarizedFinancialInformationEquity	-7955300000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	38213800000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilities	31305900000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity EquityMethodInvestmentSummarizedFinancialInformationEquity	-6907900000	USD
CY2012Q4	us-gaap	Equity Method Investment Underlying Equity In Net Assets EquityMethodInvestmentUnderlyingEquityInNetAssets	1100600000	USD
CY2011Q4	us-gaap	Equity Method Investment Underlying Equity In Net Assets EquityMethodInvestmentUnderlyingEquityInNetAssets	928300000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	4555900000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	3774500000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	750100000	USD
CY2012	pfg	Equity Method Investment Summarized Financial Information Proportionate Share Of Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationProportionateShareOfNetIncomeLoss	120100000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	5574600000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	5326200000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	4849800000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	4812300000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	719300000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	489200000	USD
CY2011	pfg	Equity Method Investment Summarized Financial Information Proportionate Share Of Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationProportionateShareOfNetIncomeLoss	116500000	USD
CY2011Q4	us-gaap	Closed Block Liabilities Other Closed Block Liabilities ClosedBlockLiabilitiesOtherClosedBlockLiabilities	32600000	USD
CY2010	pfg	Equity Method Investment Summarized Financial Information Proportionate Share Of Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationProportionateShareOfNetIncomeLoss	99900000	USD
CY2012Q4	pfg	Fixed Maturities Pledged As Collateral FixedMaturitiesPledgedAsCollateral	1540000000	USD
CY2012Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	2063400000	USD
CY2012Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases CapitalLeasesNetInvestmentInDirectFinancingLeases	655100000	USD
CY2011Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases CapitalLeasesNetInvestmentInDirectFinancingLeases	507500000	USD
CY2011Q4	us-gaap	Closed Block Liabilities ClosedBlockLiabilities	5169100000	USD
CY2011Q4	us-gaap	Assets Designated To Closed Block Fixed Maturity Available For Sale At Fair Value AssetsDesignatedToClosedBlockFixedMaturityAvailableForSaleAtFairValue	2744700000	USD
CY2011Q4	pfg	Assets Designated To Closed Block Fixed Maturity Trading At Fair Value AssetsDesignatedToClosedBlockFixedMaturityTradingAtFairValue	23200000	USD
CY2011Q4	us-gaap	Closed Block Liabilities Future Policy Benefits And Policyholder Account Balances ClosedBlockLiabilitiesFuturePolicyBenefitsAndPolicyholderAccountBalances	4829600000	USD
CY2011Q4	pfg	Closed Block Liabilities Other Policyholder Funds ClosedBlockLiabilitiesOtherPolicyholderFunds	11200000	USD
CY2011Q4	us-gaap	Closed Block Liabilities Policyholder Dividends Payable ClosedBlockLiabilitiesPolicyholderDividendsPayable	292600000	USD
CY2011Q4	us-gaap	Closed Block Liabilities Policyholder Dividend Obligation ClosedBlockLiabilitiesPolicyholderDividendObligation	3100000	USD
CY2011Q4	us-gaap	Assets Designated To Closed Block Equity Securities Available For Sale At Fair Value AssetsDesignatedToClosedBlockEquitySecuritiesAvailableForSaleAtFairValue	6100000	USD
CY2011Q4	us-gaap	Assets Designated To Closed Block Mortgage Loans On Real Estate AssetsDesignatedToClosedBlockMortgageLoansOnRealEstate	691000000	USD
CY2011Q4	us-gaap	Assets Designated To Closed Block Policy Loans AssetsDesignatedToClosedBlockPolicyLoans	697700000	USD
CY2011Q4	pfg	Assets Designated To Closed Block Other Investments AssetsDesignatedToClosedBlockOtherInvestments	172500000	USD
CY2011Q4	pfg	Assets Designated To Closed Block Total Investments AssetsDesignatedToClosedBlockTotalInvestments	4335200000	USD
CY2011Q4	us-gaap	Assets Designated To Closed Block Cash And Cash Equivalents AssetsDesignatedToClosedBlockCashAndCashEquivalents	3000000	USD
CY2011Q4	pfg	Assets Designated To Closed Block Accrued Investment Income AssetsDesignatedToClosedBlockAccruedInvestmentIncome	59600000	USD
CY2011Q4	pfg	Assets Designated To Closed Block Premiums Due And Other Receivables AssetsDesignatedToClosedBlockPremiumsDueAndOtherReceivables	13800000	USD
CY2011Q4	pfg	Assets Designated To Closed Block Deferred Income Tax Asset AssetsDesignatedToClosedBlockDeferredIncomeTaxAsset	38700000	USD
CY2011Q4	us-gaap	Assets Designated To Closed Block AssetsDesignatedToClosedBlock	4450300000	USD
CY2011Q4	us-gaap	Excess Of Reported Closed Block Liabilities Over Assets Designated To Closed Block ExcessOfReportedClosedBlockLiabilitiesOverAssetsDesignatedToClosedBlock	718800000	USD
CY2011Q4	us-gaap	Closed Block Assets And Liabilities Effect On Other Comprehensive Income ClosedBlockAssetsAndLiabilitiesEffectOnOtherComprehensiveIncome	68200000	USD
CY2011Q4	us-gaap	Closed Block Assets And Liabilities Maximum Future Earnings To Be Recognized ClosedBlockAssetsAndLiabilitiesMaximumFutureEarningsToBeRecognized	787000000	USD
CY2012Q4	us-gaap	Closed Block Liabilities Future Policy Benefits And Policyholder Account Balances ClosedBlockLiabilitiesFuturePolicyBenefitsAndPolicyholderAccountBalances	4664500000	USD
CY2012Q4	pfg	Closed Block Liabilities Other Policyholder Funds ClosedBlockLiabilitiesOtherPolicyholderFunds	10700000	USD
CY2012Q4	us-gaap	Closed Block Liabilities Policyholder Dividends Payable ClosedBlockLiabilitiesPolicyholderDividendsPayable	280600000	USD
CY2012Q4	us-gaap	Closed Block Liabilities Policyholder Dividend Obligation ClosedBlockLiabilitiesPolicyholderDividendObligation	131000000	USD
CY2012Q4	us-gaap	Closed Block Liabilities Other Closed Block Liabilities ClosedBlockLiabilitiesOtherClosedBlockLiabilities	31300000	USD
CY2012Q4	us-gaap	Closed Block Liabilities ClosedBlockLiabilities	5118100000	USD
CY2012Q4	us-gaap	Assets Designated To Closed Block Fixed Maturity Available For Sale At Fair Value AssetsDesignatedToClosedBlockFixedMaturityAvailableForSaleAtFairValue	2735100000	USD
CY2012Q4	pfg	Assets Designated To Closed Block Fixed Maturity Trading At Fair Value AssetsDesignatedToClosedBlockFixedMaturityTradingAtFairValue	17000000	USD
CY2012Q4	us-gaap	Assets Designated To Closed Block Equity Securities Available For Sale At Fair Value AssetsDesignatedToClosedBlockEquitySecuritiesAvailableForSaleAtFairValue	5500000	USD
CY2012Q4	us-gaap	Assets Designated To Closed Block Mortgage Loans On Real Estate AssetsDesignatedToClosedBlockMortgageLoansOnRealEstate	719400000	USD
CY2012Q4	us-gaap	Assets Designated To Closed Block Policy Loans AssetsDesignatedToClosedBlockPolicyLoans	665500000	USD
CY2012Q4	pfg	Assets Designated To Closed Block Other Investments AssetsDesignatedToClosedBlockOtherInvestments	158000000	USD
CY2010	us-gaap	Closed Block Operations Other Expense ClosedBlockOperationsOtherExpense	6400000	USD
CY2010	us-gaap	Closed Block Operations Benefits And Expense ClosedBlockOperationsBenefitsAndExpense	607000000	USD
CY2010	us-gaap	Closed Block Operations Results Before Income Taxes ClosedBlockOperationsResultsBeforeIncomeTaxes	111700000	USD
CY2010	us-gaap	Closed Block Operations Income Taxes ClosedBlockOperationsIncomeTaxes	36200000	USD
CY2012Q4	us-gaap	Excess Of Reported Closed Block Liabilities Over Assets Designated To Closed Block ExcessOfReportedClosedBlockLiabilitiesOverAssetsDesignatedToClosedBlock	661400000	USD
CY2012Q4	us-gaap	Closed Block Assets And Liabilities Effect On Other Comprehensive Income ClosedBlockAssetsAndLiabilitiesEffectOnOtherComprehensiveIncome	62400000	USD
CY2012Q4	us-gaap	Closed Block Assets And Liabilities Maximum Future Earnings To Be Recognized ClosedBlockAssetsAndLiabilitiesMaximumFutureEarningsToBeRecognized	723800000	USD
CY2011	us-gaap	Closed Block Operations Premiums ClosedBlockOperationsPremiums	428800000	USD
CY2011	us-gaap	Closed Block Operations Net Investment Income ClosedBlockOperationsNetInvestmentIncome	238200000	USD
CY2011	us-gaap	Closed Block Operations Realized Investment Gains Losses ClosedBlockOperationsRealizedInvestmentGainsLosses	7900000	USD
CY2011	us-gaap	Closed Block Operations Revenue ClosedBlockOperationsRevenue	674900000	USD
CY2011	pfg	Closed Block Operations Benefit Claims And Settlement Expenses ClosedBlockOperationsBenefitClaimsAndSettlementExpenses	370700000	USD
CY2011	us-gaap	Closed Block Operations Policyholder Dividends ClosedBlockOperationsPolicyholderDividends	204200000	USD
CY2011	us-gaap	Closed Block Operations Other Expense ClosedBlockOperationsOtherExpense	2900000	USD
CY2011	us-gaap	Closed Block Operations Benefits And Expense ClosedBlockOperationsBenefitsAndExpense	577800000	USD
CY2011	us-gaap	Closed Block Operations Results Before Income Taxes ClosedBlockOperationsResultsBeforeIncomeTaxes	97100000	USD
CY2011	us-gaap	Closed Block Operations Income Taxes ClosedBlockOperationsIncomeTaxes	31200000	USD
CY2011	us-gaap	Closed Block Operations Net Results ClosedBlockOperationsNetResults	65900000	USD
CY2011	pfg	Closed Block Operations Funding Adjustment Charges ClosedBlockOperationsFundingAdjustmentCharges	5300000	USD
CY2011	pfg	Closed Block Operations Net Results Net Of Funding Adjustment Charges ClosedBlockOperationsNetResultsNetOfFundingAdjustmentCharges	60600000	USD
CY2010	us-gaap	Closed Block Operations Premiums ClosedBlockOperationsPremiums	459300000	USD
CY2010	us-gaap	Closed Block Operations Net Investment Income ClosedBlockOperationsNetInvestmentIncome	257600000	USD
CY2010	us-gaap	Closed Block Operations Realized Investment Gains Losses ClosedBlockOperationsRealizedInvestmentGainsLosses	1800000	USD
CY2010	us-gaap	Closed Block Operations Revenue ClosedBlockOperationsRevenue	718700000	USD
CY2010	pfg	Closed Block Operations Benefit Claims And Settlement Expenses ClosedBlockOperationsBenefitClaimsAndSettlementExpenses	385500000	USD
CY2010	us-gaap	Closed Block Operations Policyholder Dividends ClosedBlockOperationsPolicyholderDividends	215100000	USD
CY2010	us-gaap	Closed Block Operations Net Results ClosedBlockOperationsNetResults	75500000	USD
CY2010	pfg	Closed Block Operations Funding Adjustment Charges ClosedBlockOperationsFundingAdjustmentCharges	9600000	USD
CY2010	pfg	Closed Block Operations Net Results Net Of Funding Adjustment Charges ClosedBlockOperationsNetResultsNetOfFundingAdjustmentCharges	65900000	USD
CY2012	pfg	Closed Block Operations Net Results Net Of Funding Adjustment Charges ClosedBlockOperationsNetResultsNetOfFundingAdjustmentCharges	63200000	USD
CY2012	pfg	Closed Block Operations Funding Adjustment Charges ClosedBlockOperationsFundingAdjustmentCharges	4800000	USD
CY2012	us-gaap	Closed Block Operations Net Results ClosedBlockOperationsNetResults	68000000	USD
CY2012	us-gaap	Closed Block Operations Income Taxes ClosedBlockOperationsIncomeTaxes	32600000	USD
CY2012	us-gaap	Closed Block Operations Benefits And Expense ClosedBlockOperationsBenefitsAndExpense	523200000	USD
CY2012	us-gaap	Closed Block Operations Other Expense ClosedBlockOperationsOtherExpense	4900000	USD
CY2012	us-gaap	Closed Block Operations Policyholder Dividends ClosedBlockOperationsPolicyholderDividends	192600000	USD
CY2012	pfg	Closed Block Operations Benefit Claims And Settlement Expenses ClosedBlockOperationsBenefitClaimsAndSettlementExpenses	325700000	USD
CY2012	us-gaap	Closed Block Operations Revenue ClosedBlockOperationsRevenue	623800000	USD
CY2012	us-gaap	Closed Block Operations Realized Investment Gains Losses ClosedBlockOperationsRealizedInvestmentGainsLosses	3600000	USD
CY2012	us-gaap	Closed Block Operations Net Investment Income ClosedBlockOperationsNetInvestmentIncome	222800000	USD
CY2012	us-gaap	Closed Block Operations Premiums ClosedBlockOperationsPremiums	397400000	USD
CY2012	us-gaap	Closed Block Operations Results Before Income Taxes ClosedBlockOperationsResultsBeforeIncomeTaxes	100600000	USD
CY2009Q4	us-gaap	Closed Block Assets And Liabilities Maximum Future Earnings To Be Recognized ClosedBlockAssetsAndLiabilitiesMaximumFutureEarningsToBeRecognized	913500000	USD
CY2010Q4	us-gaap	Closed Block Assets And Liabilities Maximum Future Earnings To Be Recognized ClosedBlockAssetsAndLiabilitiesMaximumFutureEarningsToBeRecognized	847600000	USD
CY2012	us-gaap	Schedule Of Closed Block Assets And Liabilities ScheduleOfClosedBlockAssetsAndLiabilities	<div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 10%; WIDTH: 96.82%; PADDING-TOP: 0pt; POSITION: relative; HEIGHT: 446px"> <p style="FONT-FAMILY: times; TEXT-ALIGN: justify"> </p> <div align="center"> <table cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="HEIGHT: 0px"><!-- TABLE COLUMN WIDTHS SET --> <td style="FONT-FAMILY: times" align="left"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="88"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="88"></td> <td style="FONT-FAMILY: times" width="12"></td><!-- TABLE COLUMN WIDTHS END --></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left"><font size="1"> </font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="2"><font size="1"><b>December 31, 2012</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="2"><font size="1"><b>December 31, 2011</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left"><font size="1"> </font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="FONT-FAMILY: times" align="center" colspan="5"><font size="1"><i>(in millions)</i></font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1"><b>Closed Block liabilities</b></font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Future policy benefits and claims</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"><b>$</b></font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>4,664.5</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1">$</font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">4,829.6</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Other policyholder funds</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>10.7</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">11.2</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Policyholder dividends payable</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>280.6</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">292.6</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Policyholder dividends obligation</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>131.0</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">3.1</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Other liabilities</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>31.3</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">32.6</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Total Closed Block liabilities</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>5,118.1</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">5,169.1</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-TOP: 9pt; MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1"><b>Assets designated to the Closed Block</b></font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Fixed maturities, available-for-sale</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>2,735.1</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">2,744.7</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Fixed maturities, trading</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>17.0</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">23.2</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Equity securities, available-for-sale</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>5.5</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">6.1</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Mortgage loans</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>719.4</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">691.0</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Policy loans</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>665.5</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">697.7</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Other investments</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>158.0</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">172.5</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Total investments</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>4,300.5</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">4,335.2</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Cash and cash equivalents</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>51.3</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">3.0</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Accrued investment income</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>52.5</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">59.6</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Premiums due and other receivables</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>13.2</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">13.8</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Deferred tax asset</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>39.2</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">38.7</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Total assets designated to the Closed Block</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>4,456.7</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">4,450.3</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Excess of Closed Block liabilities over assets designated to the Closed Block</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>661.4</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">718.8</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Amounts included in accumulated other comprehensive income</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>62.4</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">68.2</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Maximum future earnings to be recognized from Closed Block assets and liabilities</font></p></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1"><b>$</b></font></td> <td style="FONT-FAMILY: times" align="right"><font size="1"><b>723.8</b></font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td> <td style="FONT-FAMILY: times"><font size="1">$</font></td> <td style="FONT-FAMILY: times" align="right"><font size="1">787.0</font></td> <td style="FONT-FAMILY: times"><font size="1"> </font></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr></table></div> <!-- end of user-specified TAGGED TABLE --></div>
CY2012Q4	pfg	Derivative Net Credit Exposure DerivativeNetCreditExposure	838700000	USD
CY2012Q4	pfg	Derivative Collateral Received DerivativeCollateralReceived	248000000	USD
CY2011Q4	pfg	Derivative Net Credit Exposure DerivativeNetCreditExposure	1008100000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	1171100000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	1860000000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	1528000000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	1016700000	USD
CY2012	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge	-46300000	USD
CY2011	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge	132200000	USD
CY2010	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge	139500000	USD
CY2012	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	3000000	USD
CY2011	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-95900000	USD
CY2010	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-76400000	USD
CY2012Q4	us-gaap	Guaranteed Interest Contracts GuaranteedInterestContracts	10943100000	USD
CY2011Q4	us-gaap	Guaranteed Interest Contracts GuaranteedInterestContracts	11355000000	USD
CY2011	us-gaap	Deferred Policy Acquisition Cost Amortization Expense Unrealized Investment Gains Losses DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses	-166200000	USD
CY2010	us-gaap	Deferred Policy Acquisition Cost Amortization Expense Unrealized Investment Gains Losses DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses	-357900000	USD
CY2012	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	-435300000	USD
CY2012	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	92600000	USD
CY2012	us-gaap	Deferred Policy Acquisition Cost Amortization Expense Unrealized Investment Gains Losses DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses	-96900000	USD
CY2009Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	2801800000	USD
CY2010Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	2504900000	USD
CY2012Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	2673800000	USD
CY2011Q4	pfg	Derivative Collateral Pledged DerivativeCollateralPledged	502400000	USD
CY2012Q4	pfg	Derivative Collateral Pledged DerivativeCollateralPledged	296900000	USD
CY2011Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	1484000000	USD
CY2012Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	1205400000	USD
CY2011Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	502400000	USD
CY2012Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	296900000	USD
CY2012Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	79700000	USD
CY2011Q4	pfg	Cash Collateral Received Associated With Derivatives CashCollateralReceivedAssociatedWithDerivatives	237000000	USD
CY2012Q4	pfg	Cash Collateral Received Associated With Derivatives CashCollateralReceivedAssociatedWithDerivatives	207800000	USD
CY2011Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	33001600000	USD
CY2012Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	34256400000	USD
CY2011Q4	pfg	Derivative Credit Exposure DerivativeCreditExposure	1245100000	USD
CY2012Q4	pfg	Derivative Credit Exposure DerivativeCreditExposure	1086700000	USD
CY2011Q4	pfg	Derivative Collateral Received DerivativeCollateralReceived	237000000	USD
CY2011Q4	pfg	Derivative Fair Value Of Derivative Liability Investment Type Insurance Contracts DerivativeFairValueOfDerivativeLiabilityInvestmentTypeInsuranceContracts	195800000	USD
CY2012Q4	pfg	Derivative Fair Value Of Derivative Liability Investment Type Insurance Contracts DerivativeFairValueOfDerivativeLiabilityInvestmentTypeInsuranceContracts	170500000	USD
CY2011Q4	pfg	Credit Derivative Purchased Credit Protection Alternate CreditDerivativePurchasedCreditProtectionAlternate	20000000	USD
CY2012Q4	pfg	Credit Derivative Purchased Credit Protection Alternate CreditDerivativePurchasedCreditProtectionAlternate	15000000	USD
CY2012Q4	pfg	Credit Derivative Purchased Fair Value CreditDerivativePurchasedFairValue	200000	USD
CY2011Q4	pfg	Credit Derivative Purchased Fair Value CreditDerivativePurchasedFairValue	0	USD
CY2011Q4	pfg	Credit Derivative Sold Notional CreditDerivativeSoldNotional	923300000	USD
CY2012Q4	pfg	Credit Derivative Sold Notional CreditDerivativeSoldNotional	1018500000	USD
CY2011Q4	pfg	Credit Derivatives Sold Fair Value CreditDerivativesSoldFairValue	-165500000	USD
CY2012Q4	pfg	Credit Derivatives Sold Fair Value CreditDerivativesSoldFairValue	-88500000	USD
CY2011Q4	us-gaap	Credit Derivative Maximum Exposure Undiscounted CreditDerivativeMaximumExposureUndiscounted	923300000	USD
CY2012Q4	us-gaap	Credit Derivative Maximum Exposure Undiscounted CreditDerivativeMaximumExposureUndiscounted	1018500000	USD
CY2011Q4	pfg	Hybrid Instrument Amortized Cost HybridInstrumentAmortizedCost	110900000	USD
CY2012Q4	pfg	Hybrid Instrument Amortized Cost HybridInstrumentAmortizedCost	111400000	USD
CY2012Q4	us-gaap	Hybrid Instruments At Fair Value Net HybridInstrumentsAtFairValueNet	109200000	USD
CY2011Q4	us-gaap	Hybrid Instruments At Fair Value Net HybridInstrumentsAtFairValueNet	99700000	USD
CY2012	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments ChangeInUnrealizedGainLossOnFairValueHedgingInstruments	48600000	USD
CY2011	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments ChangeInUnrealizedGainLossOnFairValueHedgingInstruments	-135200000	USD
CY2010	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments ChangeInUnrealizedGainLossOnFairValueHedgingInstruments	-135800000	USD
CY2012Q4	pfg	Funding Agreements FundingAgreements	9077100000	USD
CY2011Q4	pfg	Funding Agreements FundingAgreements	8850100000	USD
CY2012Q4	pfg	Deposit Contracts Liabilities Other DepositContractsLiabilitiesOther	787200000	USD
CY2011Q4	pfg	Deposit Contracts Liabilities Other DepositContractsLiabilitiesOther	789700000	USD
CY2012Q4	us-gaap	Deposit Contracts Liabilities DepositContractsLiabilities	32123600000	USD
CY2011Q4	us-gaap	Deposit Contracts Liabilities DepositContractsLiabilities	32604300000	USD
CY2012Q4	pfg	Liability For Future Policy Benefits Individual Annuities LiabilityForFuturePolicyBenefitsIndividualAnnuities	11316200000	USD
CY2011Q4	pfg	Liability For Future Policy Benefits Individual Annuities LiabilityForFuturePolicyBenefitsIndividualAnnuities	11609500000	USD
CY2012Q4	pfg	Liability For Future Policy Benefits Universal Life And Other Reserves LiabilityForFuturePolicyBenefitsUniversalLifeAndOtherReserves	5662900000	USD
CY2011Q4	pfg	Liability For Future Policy Benefits Universal Life And Other Reserves LiabilityForFuturePolicyBenefitsUniversalLifeAndOtherReserves	5072100000	USD
CY2012Q4	pfg	Contractholder Funds ContractholderFunds	37786500000	USD
CY2009Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1025600000	USD
CY2010Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1061800000	USD
CY2011Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1006900000	USD
CY2012Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1066000000	USD
CY2012	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	711800000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	1074000000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	1611900000	USD
CY2012	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	9700000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-10800000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	11100000	USD
CY2012	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	721500000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	1063200000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	1623000000	USD
CY2012	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	446300000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	820800000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	1269400000	USD
CY2012	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	216100000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	297300000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	317400000	USD
CY2012	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid	662400000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid	1118100000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid	1586800000	USD
CY2012Q4	pfg	Liability For Unpaid Claims And Claims Adjustment Expense Net Current LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetCurrent	265500000	USD
CY2011Q4	pfg	Liability For Unpaid Claims And Claims Adjustment Expense Net Current LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetCurrent	253200000	USD
CY2010Q4	pfg	Liability For Unpaid Claims And Claims Adjustment Expense Net Current LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetCurrent	342500000	USD
CY2012Q4	pfg	Liability For Unpaid Claims And Claims Adjustment Expense Net Prior LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetPrior	800500000	USD
CY2011Q4	pfg	Liability For Unpaid Claims And Claims Adjustment Expense Net Prior LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetPrior	753700000	USD
CY2010Q4	pfg	Liability For Unpaid Claims And Claims Adjustment Expense Net Prior LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetPrior	719300000	USD
CY2012Q4	pfg	Liability For Claims Adjustment Expense LiabilityForClaimsAdjustmentExpense	46600000	USD
CY2011Q4	pfg	Liability For Claims Adjustment Expense LiabilityForClaimsAdjustmentExpense	42900000	USD
CY2010Q4	pfg	Liability For Claims Adjustment Expense LiabilityForClaimsAdjustmentExpense	40100000	USD
CY2012Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	211000000	USD
CY2011Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	177700000	USD
CY2010Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	156200000	USD
CY2012	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	<div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 12%; WIDTH: 91.51%; PADDING-TOP: 0pt; POSITION: relative; HEIGHT: 237px"> <p style="FONT-FAMILY: times; TEXT-ALIGN: justify"> </p> <div align="center"> <table cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="HEIGHT: 0px"><!-- TABLE COLUMN WIDTHS SET --> <td style="FONT-FAMILY: times" align="left"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="40"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="40"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="40"></td> <td style="FONT-FAMILY: times" width="12"></td><!-- TABLE COLUMN WIDTHS END --></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left"><font size="1"> </font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="8"><font size="1"><b>December 31,</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left"><font size="1"> </font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="2"><font size="1"><b>2012</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="2"><font size="1"><b>2011</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="2"><font size="1"><b>2010</b></font></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left"><font size="1"> </font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th> <th style="FONT-FAMILY: times" align="center" colspan="8"><font size="1"><i>(in millions)</i></font><br /></th> <th style="FONT-FAMILY: times"><font size="1"> </font></th></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Balance at beginning of year</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"><b>$</b></font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>1,006.9</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,061.8</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,025.6</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Incurred:</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Current year</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>711.8</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,074.0</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,611.9</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Prior years</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>9.7</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">(10.8</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1">)</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">11.1</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Total incurred</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>721.5</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,063.2</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,623.0</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Payments:</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Current year</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>446.3</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">820.8</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,269.4</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Prior years</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>216.1</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">297.3</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">317.4</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Total payments</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>662.4</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,118.1</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,586.8</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Balance at end of year:</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Current year</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>265.5</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">253.2</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">342.5</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Prior years</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>800.5</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">753.7</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">719.3</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Total balance at end of year</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"><b>$</b></font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>1,066.0</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,006.9</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">1,061.8</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 8pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Amounts not included in the rollforward above:</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Claim adjustment expense liabilities</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"><b>$</b></font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>46.6</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">42.9</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1">$</font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">40.1</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> <p style="MARGIN-LEFT: 16pt; TEXT-INDENT: -8pt; FONT-FAMILY: times"><font size="1">Reinsurance recoverables</font></p></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1"><b>211.0</b></font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">177.7</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td> <td style="FONT-FAMILY: times" valign="bottom" align="right"><font size="1">156.2</font></td> <td style="FONT-FAMILY: times" valign="bottom"><font size="1"> </font></td></tr></table></div> <!-- end of user-specified TAGGED TABLE --></div>
CY2012Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	40800000	USD
CY2012Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	905000000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	725000000	USD
CY2012Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	40800000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	105200000	USD
CY2011Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.038	pure
CY2012Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.047	pure
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	2671300000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	9800000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	6100000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	107400000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	299700000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	2248300000	USD
CY2011	pfg	Current State And Foreign Tax Expense Benefit CurrentStateAndForeignTaxExpenseBenefit	51400000	USD
CY2011Q4	pfg	Deferred Tax Assets Investment Including Derivative Liabilities DeferredTaxAssetsInvestmentIncludingDerivativeLiabilities	659200000	USD
CY2011Q4	pfg	Deferred Tax Assets Operating Loss Capital Loss Carryforwards DeferredTaxAssetsOperatingLossCapitalLossCarryforwards	358600000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	31500000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1758500000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1300000	USD
CY2011Q4	pfg	Total Deferred Income Tax Assets TotalDeferredIncomeTaxAssets	1757200000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	15500000	USD
CY2011Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1950400000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	115400000	USD
CY2011Q4	pfg	Deferred Tax Liabilities Investment Including Derivative Assets DeferredTaxLiabilitiesInvestmentIncludingDerivativeAssets	461000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	545700000	USD
CY2011Q4	pfg	Deferred Tax Liabilities Real Estate DeferredTaxLiabilitiesRealEstate	103300000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	166800000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	37400000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	204200000	USD
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Deductions Dividends EffectiveIncomeTaxRateReconciliationDeductionsDividends	-0.09	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	-0.04	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.03	pure
CY2011	pfg	Effective Income Tax Rate Reconciliation Court Ruling Uncertain Tax Positions EffectiveIncomeTaxRateReconciliationCourtRulingUncertainTaxPositions	0.07	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.03	pure
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.23	pure
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	114300000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1500000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	67100000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	1800000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	7300000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	43800000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Policyholder Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities	100400000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	144600000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	100800000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	208700000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-193200000	USD
CY2011	pfg	Court Ruling Uncertain Tax Positions Impact CourtRulingUncertainTaxPositionsImpact	-68900000	USD
CY2011Q4	us-gaap	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority	-263200000	USD
CY2011Q4	pfg	Deferred Tax Liabilities Deferred Policy Acquisition Costs DeferredTaxLiabilitiesDeferredPolicyAcquisitionCosts	595000000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	74100000	USD
CY2010	pfg	Current State And Foreign Tax Expense Benefit CurrentStateAndForeignTaxExpenseBenefit	34200000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	108300000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3400000	USD
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Deductions Dividends EffectiveIncomeTaxRateReconciliationDeductionsDividends	-0.11	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	-0.06	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.03	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.02	pure
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.13	pure
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-137000000	USD
CY2012	pfg	Current State And Foreign Tax Expense Benefit CurrentStateAndForeignTaxExpenseBenefit	40400000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-96600000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	231300000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	134700000	USD
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Deductions Dividends EffectiveIncomeTaxRateReconciliationDeductionsDividends	-0.10	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	-0.04	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.02	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.05	pure
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	54800000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	119500000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	10500000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4400000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	4200000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	5500000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	71400000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	44100000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Policyholder Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities	181500000	USD
CY2012Q4	pfg	Deferred Tax Assets Investment Including Derivative Liabilities DeferredTaxAssetsInvestmentIncludingDerivativeLiabilities	461200000	USD
CY2012Q4	pfg	Deferred Tax Assets Operating Loss Capital Loss Carryforwards DeferredTaxAssetsOperatingLossCapitalLossCarryforwards	383900000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	85800000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1867300000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2700000	USD
CY2012Q4	pfg	Total Deferred Income Tax Assets TotalDeferredIncomeTaxAssets	1864600000	USD
CY2012Q4	pfg	Deferred Tax Liabilities Deferred Policy Acquisition Costs DeferredTaxLiabilitiesDeferredPolicyAcquisitionCosts	664400000	USD
CY2012Q4	pfg	Deferred Tax Liabilities Investment Including Derivative Assets DeferredTaxLiabilitiesInvestmentIncludingDerivativeAssets	423800000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	1098600000	USD
CY2012Q4	pfg	Deferred Tax Liabilities Real Estate DeferredTaxLiabilitiesRealEstate	101900000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	160000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	21600000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-605700000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	626500000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	20800000	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2470300000	USD
CY2012Q4	pfg	Undistributed Foreign Earnings Without Deferred Taxes Provided UndistributedForeignEarningsWithoutDeferredTaxesProvided	629200000	USD
CY2012Q4	pfg	Excess Carrying Value Over Tax Basis Without Deferred Taxes Provided ExcessCarryingValueOverTaxBasisWithoutDeferredTaxesProvided	106200000	USD
CY2012Q4	us-gaap	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority	-334600000	USD
CY2011	pfg	Income Tax Examination Deficiency Including Interest20042005 IncomeTaxExaminationDeficiencyIncludingInterest20042005	62100000	USD
CY2011	pfg	Income Tax Examination Deficiency Including Interest20062008 IncomeTaxExaminationDeficiencyIncludingInterest20062008	46700000	USD
CY2012Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Estimated Range Of Change Lower Bound SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound	0	USD
CY2012Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Estimated Range Of Change Upper Bound SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound	-28500000	USD
CY2012Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	258000000	USD
CY2008	pfg	Proceeds From Termination Of Certain Structured Transactions And Resulting Prepayment ProceedsFromTerminationOfCertainStructuredTransactionsAndResultingPrepayment	440000000	USD
CY2012	us-gaap	Loss Contingency Undiscounted Amount Of Insurance Related Assessment Liability LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiability	31000000	USD
CY2011	us-gaap	Loss Contingency Undiscounted Amount Of Insurance Related Assessment Liability LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiability	38700000	USD
CY2012Q4	us-gaap	Loss Contingency Accrual Insurance Related Assessment Premium Tax Offset LossContingencyAccrualInsuranceRelatedAssessmentPremiumTaxOffset	16500000	USD
CY2011Q4	us-gaap	Loss Contingency Accrual Insurance Related Assessment Premium Tax Offset LossContingencyAccrualInsuranceRelatedAssessmentPremiumTaxOffset	22600000	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	53100000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	41900000	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	51100000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	43000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	37900000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	30600000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	25000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	12200000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	60000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	208700000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	5400000	USD
CY2012Q4	pfg	Operating Leases Future Minimum Payments Due Net OperatingLeasesFutureMinimumPaymentsDueNet	203300000	USD
CY2012Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	35500000	USD
CY2011Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	24400000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	5700000	USD
CY2012Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	11500000	USD
CY2011Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	13700000	USD
CY2010	us-gaap	Capital Leases Income Statement Amortization Expense CapitalLeasesIncomeStatementAmortizationExpense	4200000	USD
CY2012	us-gaap	Capital Leases Income Statement Amortization Expense CapitalLeasesIncomeStatementAmortizationExpense	7900000	USD
CY2011	us-gaap	Capital Leases Income Statement Amortization Expense CapitalLeasesIncomeStatementAmortizationExpense	4400000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	5300000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	5000000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	2100000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	13200000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	500000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	12700000	USD
CY2012	pfg	Adjustments For Assumed Changes In Amortization Patterns Available For Sale Securities Before Tax AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesBeforeTax	169000000	USD
CY2012	pfg	Adjustments For Assumed Changes In Liability For Policyholder Benefits And Claims Before Tax AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsBeforeTax	689200000	USD
CY2012	pfg	Other Comprehensive Income Available For Sale Securities Period Increase Decrease Before Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseBeforeTax	826900000	USD
CY2012	pfg	Other Comprehensive Income Noncredit Impairment Losses Arising During Period Before Tax OtherComprehensiveIncomeNoncreditImpairmentLossesArisingDuringPeriodBeforeTax	17300000	USD
CY2012	pfg	Adjustments For Assumed Changes In Amortization Patterns Other Than Temporary Impairment Losses Before Tax AdjustmentsForAssumedChangesInAmortizationPatternsOtherThanTemporaryImpairmentLossesBeforeTax	4000000	USD
CY2012	pfg	Other Comprehensive Income Reclassification Adjustment Before Tax OtherComprehensiveIncomeReclassificationAdjustmentBeforeTax	10100000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-25900000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	3400000	USD
CY2012	pfg	Adjustments For Assumed Changes In Amortization Patterns Derivatives Before Tax AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesBeforeTax	-25900000	USD
CY2012	pfg	Other Comprehensive Income Derivatives Period Increase Decrease Before Tax OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseBeforeTax	-66600000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-20400000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	245700000	USD
CY2012	pfg	Other Comprehensive Income Reclassification Of Defined Benefit Plans Prior Service Cost And Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	-49600000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	533700000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	196100000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	559400000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	112000000	USD
CY2011	pfg	Adjustments For Assumed Changes In Amortization Patterns Available For Sale Securities Before Tax AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesBeforeTax	114900000	USD
CY2011	pfg	Adjustments For Assumed Changes In Liability For Policyholder Benefits And Claims Before Tax AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsBeforeTax	230300000	USD
CY2011	pfg	Other Comprehensive Income Available For Sale Securities Period Increase Decrease Before Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseBeforeTax	326200000	USD
CY2011	pfg	Other Comprehensive Income Noncredit Impairment Losses Arising During Period Before Tax OtherComprehensiveIncomeNoncreditImpairmentLossesArisingDuringPeriodBeforeTax	-49900000	USD
CY2011	pfg	Adjustments For Assumed Changes In Amortization Patterns Other Than Temporary Impairment Losses Before Tax AdjustmentsForAssumedChangesInAmortizationPatternsOtherThanTemporaryImpairmentLossesBeforeTax	-1400000	USD
CY2011	pfg	Other Comprehensive Income Reclassification Adjustment Before Tax OtherComprehensiveIncomeReclassificationAdjustmentBeforeTax	-48500000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	39600000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	20700000	USD
CY2011	pfg	Adjustments For Assumed Changes In Amortization Patterns Derivatives Before Tax AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesBeforeTax	23900000	USD
CY2011	pfg	Other Comprehensive Income Derivatives Period Increase Decrease Before Tax OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseBeforeTax	36400000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-139400000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	286700000	USD
CY2011	pfg	Other Comprehensive Income Reclassification Of Defined Benefit Plans Prior Service Cost And Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	-20700000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	266000000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	2016400000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	236700000	USD
CY2010	pfg	Adjustments For Assumed Changes In Amortization Patterns Available For Sale Securities Before Tax AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesBeforeTax	390900000	USD
CY2010	pfg	Adjustments For Assumed Changes In Liability For Policyholder Benefits And Claims Before Tax AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsBeforeTax	136700000	USD
CY2010	pfg	Other Comprehensive Income Available For Sale Securities Period Increase Decrease Before Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseBeforeTax	1725500000	USD
CY2010	pfg	Other Comprehensive Income Noncredit Impairment Losses Arising During Period Before Tax OtherComprehensiveIncomeNoncreditImpairmentLossesArisingDuringPeriodBeforeTax	56100000	USD
CY2010	pfg	Adjustments For Assumed Changes In Amortization Patterns Other Than Temporary Impairment Losses Before Tax AdjustmentsForAssumedChangesInAmortizationPatternsOtherThanTemporaryImpairmentLossesBeforeTax	4200000	USD
CY2010	pfg	Other Comprehensive Income Reclassification Adjustment Before Tax OtherComprehensiveIncomeReclassificationAdjustmentBeforeTax	51900000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-1200000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	37900000	USD
CY2010	pfg	Adjustments For Assumed Changes In Amortization Patterns Derivatives Before Tax AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesBeforeTax	15500000	USD
CY2010	pfg	Other Comprehensive Income Derivatives Period Increase Decrease Before Tax OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseBeforeTax	21200000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	19500000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	-271000000	USD
CY2010	pfg	Other Comprehensive Income Reclassification Of Defined Benefit Plans Prior Service Cost And Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	-49000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-320000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	2034300000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	520600000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	38400000	USD
CY2012	pfg	Adjustments For Assumed Changes In Amortization Patterns Available For Sale Securities Tax AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesTax	59100000	USD
CY2012	pfg	Adjustments For Assumed Changes In Liability For Policyholder Benefits And Claims Tax AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsTax	230600000	USD
CY2012	pfg	Other Comprehensive Income Available For Sale Securities Period Increase Decrease Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseTax	269300000	USD
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	6100000	USD
CY2012	pfg	Adjustments For Assumed Changes In Amortization Patterns Other Than Temporary Impairment Losses Tax AdjustmentsForAssumedChangesInAmortizationPatternsOtherThanTemporaryImpairmentLossesTax	1600000	USD
CY2012	pfg	Other Comprehensive Income Reclassification Adjustment Tax OtherComprehensiveIncomeReclassificationAdjustmentTax	3400000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-9100000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	1500000	USD
CY2012	pfg	Adjustments For Assumed Changes In Amortization Patterns Derivatives Tax AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesTax	-9100000	USD
CY2012	pfg	Other Comprehensive Income Derivatives Period Increase Decrease Tax OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseTax	-23000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-15600000	USD
CY2012	pfg	Other Comprehensive Income Defined Benefit Plans Net Prior Service Cost And Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetPriorServiceCostAndNetUnamortizedGainLossArisingDuringPeriodTax	-86000000	USD
CY2012	pfg	Other Comprehensive Income Reclassification Of Defined Benefit Plans Prior Service Cost And Net Gain Loss Recognized In Net Periodic Benefit Cost Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostTax	-17300000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	68700000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	158600000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1056700000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	69400000	USD
CY2012	pfg	Adjustments For Assumed Changes In Amortization Patterns Available For Sale Securities Net Of Tax AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesNetOfTax	109900000	USD
CY2012	pfg	Adjustments For Assumed Changes In Liability For Policyholder Benefits And Claims Net Of Tax AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsNetOfTax	458600000	USD
CY2012	pfg	Other Comprehensive Income Available For Sale Securities Period Increase Decrease Net Of Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseNetOfTax	557600000	USD
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	11200000	USD
CY2012	pfg	Adjustments For Assumed Changes In Amortization Patterns Noncredit Impairment Losses Net Of Tax AdjustmentsForAssumedChangesInAmortizationPatternsNoncreditImpairmentLossesNetOfTax	2400000	USD
CY2012	pfg	Other Comprehensive Income Reclassification Adjustment Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax	6700000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-16800000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	1900000	USD
CY2012	pfg	Adjustments For Assumed Changes In Amortization Patterns Derivatives Net Of Tax AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesNetOfTax	-16800000	USD
CY2012	pfg	Other Comprehensive Income Derivatives Period Increase Decrease Net Of Tax OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseNetOfTax	-43600000	USD
CY2012	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-4800000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	159700000	USD
CY2012	pfg	Other Comprehensive Income Reclassification Of Defined Benefit Plans Prior Service Cost And Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	-32300000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	127400000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	688000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	84200000	USD
CY2010	pfg	Adjustments For Assumed Changes In Amortization Patterns Available For Sale Securities Tax AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesTax	136800000	USD
CY2010	pfg	Adjustments For Assumed Changes In Liability For Policyholder Benefits And Claims Tax AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsTax	23400000	USD
CY2010	pfg	Other Comprehensive Income Available For Sale Securities Period Increase Decrease Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseTax	612000000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	19700000	USD
CY2010	pfg	Adjustments For Assumed Changes In Amortization Patterns Other Than Temporary Impairment Losses Tax AdjustmentsForAssumedChangesInAmortizationPatternsOtherThanTemporaryImpairmentLossesTax	1500000	USD
CY2010	pfg	Other Comprehensive Income Reclassification Adjustment Tax OtherComprehensiveIncomeReclassificationAdjustmentTax	18200000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	300000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	13400000	USD
CY2010	pfg	Adjustments For Assumed Changes In Amortization Patterns Derivatives Tax AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesTax	5400000	USD
CY2010	pfg	Other Comprehensive Income Derivatives Period Increase Decrease Tax OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseTax	8300000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-12400000	USD
CY2010	pfg	Other Comprehensive Income Defined Benefit Plans Net Prior Service Cost And Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetPriorServiceCostAndNetUnamortizedGainLossArisingDuringPeriodTax	94900000	USD
CY2010	pfg	Other Comprehensive Income Reclassification Of Defined Benefit Plans Prior Service Cost And Net Gain Loss Recognized In Net Periodic Benefit Cost Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostTax	-17100000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-112000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	701700000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	204000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	42900000	USD
CY2011	pfg	Adjustments For Assumed Changes In Amortization Patterns Available For Sale Securities Tax AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesTax	40200000	USD
CY2011	pfg	Adjustments For Assumed Changes In Liability For Policyholder Benefits And Claims Tax AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsTax	89100000	USD
CY2011	pfg	Other Comprehensive Income Available For Sale Securities Period Increase Decrease Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseTax	117600000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	-18000000	USD
CY2011	pfg	Adjustments For Assumed Changes In Amortization Patterns Other Than Temporary Impairment Losses Tax AdjustmentsForAssumedChangesInAmortizationPatternsOtherThanTemporaryImpairmentLossesTax	-500000	USD
CY2011	pfg	Other Comprehensive Income Reclassification Adjustment Tax OtherComprehensiveIncomeReclassificationAdjustmentTax	-17500000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	13800000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	7400000	USD
CY2011	pfg	Adjustments For Assumed Changes In Amortization Patterns Derivatives Tax AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesTax	8400000	USD
CY2011	pfg	Other Comprehensive Income Derivatives Period Increase Decrease Tax OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseTax	12800000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	100000	USD
CY2011	pfg	Other Comprehensive Income Defined Benefit Plans Net Prior Service Cost And Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetPriorServiceCostAndNetUnamortizedGainLossArisingDuringPeriodTax	-100300000	USD
CY2011	pfg	Other Comprehensive Income Reclassification Of Defined Benefit Plans Prior Service Cost And Net Gain Loss Recognized In Net Periodic Benefit Cost Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostTax	-7200000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	93100000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	54900000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	355400000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	69100000	USD
CY2011	pfg	Adjustments For Assumed Changes In Amortization Patterns Available For Sale Securities Net Of Tax AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesNetOfTax	74700000	USD
CY2011	pfg	Adjustments For Assumed Changes In Liability For Policyholder Benefits And Claims Net Of Tax AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsNetOfTax	141200000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	-31900000	USD
CY2011	pfg	Adjustments For Assumed Changes In Amortization Patterns Noncredit Impairment Losses Net Of Tax AdjustmentsForAssumedChangesInAmortizationPatternsNoncreditImpairmentLossesNetOfTax	-900000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	25800000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	13300000	USD
CY2011	pfg	Adjustments For Assumed Changes In Amortization Patterns Derivatives Net Of Tax AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesNetOfTax	15500000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	186400000	USD
CY2011	pfg	Other Comprehensive Income Reclassification Of Defined Benefit Plans Prior Service Cost And Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	-13500000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1328400000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	152500000	USD
CY2010	pfg	Adjustments For Assumed Changes In Amortization Patterns Available For Sale Securities Net Of Tax AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesNetOfTax	254100000	USD
CY2010	pfg	Adjustments For Assumed Changes In Liability For Policyholder Benefits And Claims Net Of Tax AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsNetOfTax	113300000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	36400000	USD
CY2010	pfg	Adjustments For Assumed Changes In Amortization Patterns Noncredit Impairment Losses Net Of Tax AdjustmentsForAssumedChangesInAmortizationPatternsNoncreditImpairmentLossesNetOfTax	2700000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-1500000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	24500000	USD
CY2010	pfg	Adjustments For Assumed Changes In Amortization Patterns Derivatives Net Of Tax AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesNetOfTax	10100000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	-176100000	USD
CY2010	pfg	Other Comprehensive Income Reclassification Of Defined Benefit Plans Prior Service Cost And Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	-31900000	USD
CY2011	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	200000	USD
CY2012	pfg	Redeemable Noncontrolling Interest Assumed RedeemableNoncontrollingInterestAssumed	37200000	USD
CY2012	pfg	Distributions To Redeemable Noncontrolling Interest DistributionsToRedeemableNoncontrollingInterest	2000000	USD
CY2012	pfg	Foreign Currency Transaction Attributable To Redeemable Noncontrolling Interest ForeignCurrencyTransactionAttributableToRedeemableNoncontrollingInterest	1100000	USD
CY2012Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	60400000	USD
CY2011	pfg	Redeemable Noncontrolling Interest Assumed RedeemableNoncontrollingInterestAssumed	22000000	USD
CY2012	pfg	Dividend Restriction Percentage Of Policyholders Surplus DividendRestrictionPercentageOfPolicyholdersSurplus	0.10	pure
CY2012Q4	us-gaap	Amount Available For Dividend Distribution Without Prior Approval From Regulatory Agency AmountAvailableForDividendDistributionWithoutPriorApprovalFromRegulatoryAgency	472000000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	1577300000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	107800000	USD
CY2012Q4	pfg	Fixed Maturity Securities Level3 Valued Using Internal Pricing Models FixedMaturitySecuritiesLevel3ValuedUsingInternalPricingModels	0.01	pure
CY2012Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	11519700000	USD
CY2011	pfg	Deferred Policy Acquisition And Sales Inducement Costs Amortization Expense DeferredPolicyAcquisitionAndSalesInducementCostsAmortizationExpense	21500000	USD
CY2012Q4	us-gaap	State Insurance Department Statutory To Naic Amount Of Reconciling Item StateInsuranceDepartmentStatutoryToNAICAmountOfReconcilingItem	-211100000	USD
CY2010	us-gaap	Statutory Accounting Practices Statutory Net Income Amount StatutoryAccountingPracticesStatutoryNetIncomeAmount	404600000	USD
CY2012	us-gaap	Statutory Accounting Practices Statutory Net Income Amount StatutoryAccountingPracticesStatutoryNetIncomeAmount	576100000	USD
CY2011	us-gaap	Statutory Accounting Practices Statutory Net Income Amount StatutoryAccountingPracticesStatutoryNetIncomeAmount	326800000	USD
CY2010Q4	us-gaap	Statutory Accounting Practices Statutory Capital And Surplus Balance StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance	4377800000	USD
CY2012Q4	us-gaap	Statutory Accounting Practices Statutory Capital And Surplus Balance StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance	3944300000	USD
CY2011Q4	us-gaap	Statutory Accounting Practices Statutory Capital And Surplus Balance StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance	4218200000	USD
CY2012	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	9175400000	USD
CY2012	pfg	Segment Reporting Information Net Realized Capital Gains Losses SegmentReportingInformationNetRealizedCapitalGainsLosses	14700000	USD
CY2011	pfg	Segment Reporting Information Net Realized Capital Gains Losses SegmentReportingInformationNetRealizedCapitalGainsLosses	-221500000	USD
CY2010	pfg	Segment Reporting Information Net Realized Capital Gains Losses SegmentReportingInformationNetRealizedCapitalGainsLosses	-281900000	USD
CY2012	pfg	Exited Group Medical Insurance Business Revenues ExitedGroupMedicalInsuranceBusinessRevenues	25000000	USD
CY2011	pfg	Exited Group Medical Insurance Business Revenues ExitedGroupMedicalInsuranceBusinessRevenues	606300000	USD
CY2010	pfg	Exited Group Medical Insurance Business Revenues ExitedGroupMedicalInsuranceBusinessRevenues	1403900000	USD
CY2011	pfg	Assumption Change Within Individual Life Business Revenues AssumptionChangeWithinIndividualLifeBusinessRevenues	4900000	USD
CY2012	pfg	Operating Earnings OperatingEarnings	808000000	USD
CY2012	pfg	Segment Reporting Information Net Realized Capital Gains Losses Net Of Tax And Adjustments SegmentReportingInformationNetRealizedCapitalGainsLossesNetOfTaxAndAdjustments	39100000	USD
CY2011	pfg	Segment Reporting Information Net Realized Capital Gains Losses Net Of Tax And Adjustments SegmentReportingInformationNetRealizedCapitalGainsLossesNetOfTaxAndAdjustments	-141800000	USD
CY2010	pfg	Segment Reporting Information Net Realized Capital Gains Losses Net Of Tax And Adjustments SegmentReportingInformationNetRealizedCapitalGainsLossesNetOfTaxAndAdjustments	-189000000	USD
CY2012	pfg	Segment Reporting Information Other Adjustments After Tax SegmentReportingInformationOtherAdjustmentsAfterTax	-74200000	USD
CY2011	pfg	Segment Reporting Information Other Adjustments After Tax SegmentReportingInformationOtherAdjustmentsAfterTax	-82300000	USD
CY2010	pfg	Segment Reporting Information Other Adjustments After Tax SegmentReportingInformationOtherAdjustmentsAfterTax	15700000	USD
CY2011	pfg	Other Adjustments Charitable Contribution OtherAdjustmentsCharitableContribution	-19500000	USD
CY2011	pfg	Executive Life Of New York Liquidation ExecutiveLifeOfNewYorkLiquidation	-10300000	USD
CY2011	pfg	Group Medical Insurance Business Not Discontinued Operation GroupMedicalInsuranceBusinessNotDiscontinuedOperation	50900000	USD
CY2010	pfg	Group Medical Insurance Business Not Discontinued Operation GroupMedicalInsuranceBusinessNotDiscontinuedOperation	24000000	USD
CY2010	pfg	Tax Impact Of Healthcare Reform TaxImpactOfHealthcareReform	-7800000	USD
CY2010	pfg	Terminated Commercial Mortgage Securities Issuance Operation Not Discontinued Operation TerminatedCommercialMortgageSecuritiesIssuanceOperationNotDiscontinuedOperation	-500000	USD
CY2011	pfg	Assumption Change Within Individual Life Business Impact AssumptionChangeWithinIndividualLifeBusinessImpact	-34500000	USD
CY2012	pfg	Derivative And Hedging Related Adjustments DerivativeAndHedgingRelatedAdjustments	98900000	USD
CY2011	pfg	Derivative And Hedging Related Adjustments DerivativeAndHedgingRelatedAdjustments	98800000	USD
CY2010	pfg	Derivative And Hedging Related Adjustments DerivativeAndHedgingRelatedAdjustments	90000000	USD
CY2012	pfg	Market Value Adjustments Fee Revenues MarketValueAdjustmentsFeeRevenues	300000	USD
CY2011	pfg	Market Value Adjustments Fee Revenues MarketValueAdjustmentsFeeRevenues	100000	USD
CY2010	pfg	Market Value Adjustments Fee Revenues MarketValueAdjustmentsFeeRevenues	3400000	USD
CY2012	pfg	Front End Fee Revenues Recognition FrontEndFeeRevenuesRecognition	-200000	USD
CY2011	pfg	Front End Fee Revenues Recognition FrontEndFeeRevenuesRecognition	-300000	USD
CY2010	pfg	Front End Fee Revenues Recognition FrontEndFeeRevenuesRecognition	1700000	USD
CY2012	pfg	Deferred Policy Acquisition And Sales Inducement Costs Amortization Expense DeferredPolicyAcquisitionAndSalesInducementCostsAmortizationExpense	-36600000	USD
CY2010	pfg	Deferred Policy Acquisition And Sales Inducement Costs Amortization Expense DeferredPolicyAcquisitionAndSalesInducementCostsAmortizationExpense	22100000	USD
CY2012	pfg	Capital Gains Losses Distributed CapitalGainsLossesDistributed	12200000	USD
CY2011	pfg	Capital Gains Losses Distributed CapitalGainsLossesDistributed	3100000	USD
CY2010	pfg	Capital Gains Losses Distributed CapitalGainsLossesDistributed	12000000	USD
CY2012	pfg	Market Value Adjustments Embedded Derivatives MarketValueAdjustmentsEmbeddedDerivatives	-600000	USD
CY2011	pfg	Market Value Adjustments Embedded Derivatives MarketValueAdjustmentsEmbeddedDerivatives	65600000	USD
CY2010	pfg	Market Value Adjustments Embedded Derivatives MarketValueAdjustmentsEmbeddedDerivatives	7200000	USD
CY2012	pfg	Net Realized Capital Gains Losses Exited Group Medical Insurance Business NetRealizedCapitalGainsLossesExitedGroupMedicalInsuranceBusiness	200000	USD
CY2011	pfg	Net Realized Capital Gains Losses Exited Group Medical Insurance Business NetRealizedCapitalGainsLossesExitedGroupMedicalInsuranceBusiness	-200000	USD
CY2010	pfg	Net Realized Capital Gains Losses Exited Group Medical Insurance Business NetRealizedCapitalGainsLossesExitedGroupMedicalInsuranceBusiness	3000000	USD
CY2012	pfg	Noncontrolling Interest Capital Gains Losses NoncontrollingInterestCapitalGainsLosses	8300000	USD
CY2011	pfg	Noncontrolling Interest Capital Gains Losses NoncontrollingInterestCapitalGainsLosses	31600000	USD
CY2010	pfg	Noncontrolling Interest Capital Gains Losses NoncontrollingInterestCapitalGainsLosses	11600000	USD
CY2012	pfg	Net Realized Capital Gains Losses Income Taxes NetRealizedCapitalGainsLossesIncomeTaxes	-8700000	USD
CY2011	pfg	Net Realized Capital Gains Losses Income Taxes NetRealizedCapitalGainsLossesIncomeTaxes	-70500000	USD
CY2010	pfg	Net Realized Capital Gains Losses Income Taxes NetRealizedCapitalGainsLossesIncomeTaxes	-128400000	USD
CY2012	pfg	Segment Reporting Information Other After Tax Adjustments Tax Effect SegmentReportingInformationOtherAfterTaxAdjustmentsTaxEffect	-42600000	USD
CY2011	pfg	Segment Reporting Information Other After Tax Adjustments Tax Effect SegmentReportingInformationOtherAfterTaxAdjustmentsTaxEffect	44700000	USD
CY2010	pfg	Segment Reporting Information Other After Tax Adjustments Tax Effect SegmentReportingInformationOtherAfterTaxAdjustmentsTaxEffect	21000000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	18800000	USD
CY2012	us-gaap	Dividends Preferred Stock DividendsPreferredStock	33000000	USD
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	297500000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	314500000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	320300000	shares
CY2012	pfg	Incremental Common Shares Attributable To Stock Options IncrementalCommonSharesAttributableToStockOptions	1000000	shares
CY2012	pfg	Incremental Common Shares Attributable To Restricted Stock Units IncrementalCommonSharesAttributableToRestrictedStockUnits	1500000	shares
CY2012	pfg	Incremental Common Shares Attributable To Performance Share Awards IncrementalCommonSharesAttributableToPerformanceShareAwards	400000	shares
CY2011	pfg	Incremental Common Shares Attributable To Stock Options IncrementalCommonSharesAttributableToStockOptions	1200000	shares
CY2010	pfg	Incremental Common Shares Attributable To Stock Options IncrementalCommonSharesAttributableToStockOptions	900000	shares
CY2011	pfg	Incremental Common Shares Attributable To Restricted Stock Units IncrementalCommonSharesAttributableToRestrictedStockUnits	1500000	shares
CY2010	pfg	Incremental Common Shares Attributable To Restricted Stock Units IncrementalCommonSharesAttributableToRestrictedStockUnits	1500000	shares
CY2011	pfg	Incremental Common Shares Attributable To Performance Share Awards IncrementalCommonSharesAttributableToPerformanceShareAwards	400000	shares
CY2010	pfg	Incremental Common Shares Attributable To Performance Share Awards IncrementalCommonSharesAttributableToPerformanceShareAwards	300000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	300400000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	317600000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	323000000	shares
CY2012Q4	us-gaap	Revenues Revenues	2295900000	USD
CY2012Q3	us-gaap	Revenues Revenues	2704700000	USD
CY2012Q2	us-gaap	Revenues Revenues	2118600000	USD
CY2012Q1	us-gaap	Revenues Revenues	2095900000	USD
CY2011Q4	us-gaap	Revenues Revenues	2058800000	USD
CY2011Q3	us-gaap	Revenues Revenues	2093600000	USD
CY2011Q2	us-gaap	Revenues Revenues	2296400000	USD
CY2011Q1	us-gaap	Revenues Revenues	2221900000	USD
CY2012Q4	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2030000000	USD
CY2012Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2523300000	USD
CY2012Q2	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	1883600000	USD
CY2012Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	1818800000	USD
CY2011Q4	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	1888500000	USD
CY2011Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	1942500000	USD
CY2011Q2	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	1986200000	USD
CY2011Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	1960400000	USD
CY2012Q4	us-gaap	Profit Loss ProfitLoss	230400000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	191300000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	184100000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	218900000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	156400000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	74500000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	249200000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	208800000	USD
CY2012Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	218600000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	179700000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	173100000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	201500000	USD
CY2011Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	148500000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	71900000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	217300000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	182000000	USD
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.61
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.58
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.68
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.58
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.67
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2011	us-gaap	Goodwill Translation Adjustments GoodwillTranslationAdjustments	-17300000	USD
CY2012	pfg	Cash And Cash Equivalents Maximum Maturity Period CashAndCashEquivalentsMaximumMaturityPeriod	P3M
CY2012	pfg	Long Term Debt Minimum Maturity Period LongTermDebtMinimumMaturityPeriod	P1Y
CY2012	pfg	Credit Derivatives Sold Weighted Average Expected Life CreditDerivativesSoldWeightedAverageExpectedLife	P2Y10M24D
CY2011	pfg	Credit Derivatives Sold Weighted Average Expected Life CreditDerivativesSoldWeightedAverageExpectedLife	P3Y1M6D
CY2011	pfg	Hybrid Instruments Weighted Average Expected Life HybridInstrumentsWeightedAverageExpectedLife	P3Y10M24D
CY2012	pfg	Hybrid Instruments Weighted Average Expected Life HybridInstrumentsWeightedAverageExpectedLife	P3Y9M18D
CY2012Q4	pfg	Contractholder And Other Policyholder Funds ContractholderAndOtherPolicyholderFunds	38502900000	USD
CY2011Q4	pfg	Contractholder And Other Policyholder Funds ContractholderAndOtherPolicyholderFunds	38225000000	USD
CY2011	us-gaap	Supplementary Insurance Information Other Operating Expense SupplementaryInsuranceInformationOtherOperatingExpense	2690500000	USD
CY2010	us-gaap	Supplementary Insurance Information Other Operating Expense SupplementaryInsuranceInformationOtherOperatingExpense	2719600000	USD
CY2012	us-gaap	Supplementary Insurance Information Other Operating Expense SupplementaryInsuranceInformationOtherOperatingExpense	2841500000	USD
CY2012Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Cost SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost	64247900000	USD
CY2012Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Carrying Amount SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount	68811300000	USD
CY2011	us-gaap	Interest Paid InterestPaid	154100000	USD
CY2010	us-gaap	Interest Paid InterestPaid	123400000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	152800000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	55200000	USD
CY2012	pfg	Adjustments For Assumed Changes In Policyholder Liabilities Other Than Temporary Impairment Losses Before Tax AdjustmentsForAssumedChangesInPolicyholderLiabilitiesOtherThanTemporaryImpairmentLossesBeforeTax	3200000	USD
CY2012	pfg	Adjustments For Assumed Changes In Policyholder Liabilities Derivatives Before Tax AdjustmentsForAssumedChangesInPolicyholderLiabilitiesDerivativesBeforeTax	70000000	USD
CY2012	pfg	Adjustments For Assumed Changes In Policyholder Liabilities Other Than Temporary Impairment Losses Tax AdjustmentsForAssumedChangesInPolicyholderLiabilitiesOtherThanTemporaryImpairmentLossesTax	1100000	USD
CY2012	pfg	Adjustments For Assumed Changes In Policyholder Liabilities Derivatives Tax AdjustmentsForAssumedChangesInPolicyholderLiabilitiesDerivativesTax	24500000	USD
CY2012	pfg	Adjustments For Assumed Changes In Policyholder Liabilities Other Than Temporary Impairment Losses Net Of Tax AdjustmentsForAssumedChangesInPolicyholderLiabilitiesOtherThanTemporaryImpairmentLossesNetOfTax	2100000	USD
CY2012	pfg	Adjustments For Assumed Changes In Policyholder Liabilities Derivatives Net Of Tax AdjustmentsForAssumedChangesInPolicyholderLiabilitiesDerivativesNetOfTax	45500000	USD
CY2012	pfg	Other Adjustments Charitable Contribution OtherAdjustmentsCharitableContribution	-39800000	USD
CY2012	pfg	One Time Costs Early Extinguishment Of Long Term Debt OneTimeCostsEarlyExtinguishmentOfLongTermDebt	-24800000	USD
CY2011	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	8281000000	USD
CY2011	pfg	Operating Earnings OperatingEarnings	843800000	USD
CY2010	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	8077000000	USD
CY2010	pfg	Operating Earnings OperatingEarnings	803200000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	20000000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1179800000	USD
CY2012	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	-30800000	USD
CY2012	us-gaap	Proceeds From Payments For Trading Securities ProceedsFromPaymentsForTradingSecurities	335800000	USD
CY2012	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-70600000	USD
CY2012	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	2054700000	USD
CY2012	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	20400000	USD
CY2012	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	141300000	USD
CY2012	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	48000000	USD
CY2012	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	90000000	USD
CY2012	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	43900000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	63800000	USD
CY2012	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	43900000	USD
CY2012	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	2256200000	USD
CY2011	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	270500000	USD
CY2012	us-gaap	Interest Paid InterestPaid	127700000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	82700000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	28900000	USD
CY2012	pfg	Share Based Compensation Including Tax Effect ShareBasedCompensationIncludingTaxEffect	63600000	USD
CY2012	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	272700000	USD
CY2012	us-gaap	Dividends Common Stock DividendsCommonStock	231300000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	10700000	USD
CY2012	us-gaap	Minority Interest Increase From Stock Issuance MinorityInterestIncreaseFromStockIssuance	13100000	USD
CY2012	us-gaap	Noncontrolling Interest Decrease From Deconsolidation NoncontrollingInterestDecreaseFromDeconsolidation	353200000	USD
CY2012	pfg	Profit Loss Excluding Redeemable Noncontrolling Interest ProfitLossExcludingRedeemableNoncontrollingInterest	822800000	USD
CY2012	pfg	Other Comprehensive Income Loss Net Of Tax Excluding Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxExcludingRedeemableNoncontrollingInterest	374000000	USD
CY2011Q4	pfg	Net Operating Losses Included In Federal Tax Return NetOperatingLossesIncludedInFederalTaxReturn	448900000	USD
CY2011Q4	pfg	Net Operating Losses Excluded From Federal Tax Return NetOperatingLossesExcludedFromFederalTaxReturn	482600000	USD
CY2012Q4	pfg	Net Operating Losses Included In Federal Tax Return NetOperatingLossesIncludedInFederalTaxReturn	274500000	USD
CY2010	pfg	Terminated Commercial Mortgage Securities Issuance Operation Revenues TerminatedCommercialMortgageSecuritiesIssuanceOperationRevenues	-800000	USD
CY2012	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	73800000	USD
CY2012	us-gaap	Goodwill Other Changes GoodwillOtherChanges	4000000	USD
CY2012	us-gaap	Goodwill Translation Adjustments GoodwillTranslationAdjustments	-8700000	USD
CY2012Q4	pfg	Net Operating Losses Excluded From Federal Tax Return NetOperatingLossesExcludedFromFederalTaxReturn	710600000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	700000	USD
CY2012	pfg	Group Medical Insurance Business Not Discontinued Operation GroupMedicalInsuranceBusinessNotDiscontinuedOperation	-9600000	USD

Files In Submission

Name	View Source	Status
0001047469-13-000940-index-headers.html	Edgar Link	pending
0001047469-13-000940-index.html	Edgar Link	pending
0001047469-13-000940.txt	Edgar Link	pending
0001047469-13-000940-xbrl.zip	Edgar Link	pending
a2212740z10-k.htm	Edgar Link	pending
a2212740zex-12.htm	Edgar Link	pending
a2212740zex-21.htm	Edgar Link	pending
a2212740zex-23.htm	Edgar Link	pending
a2212740zex-31_1.htm	Edgar Link	pending
a2212740zex-31_2.htm	Edgar Link	pending
a2212740zex-32_1.htm	Edgar Link	pending
a2212740zex-32_2.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
g675963.jpg	Edgar Link	pending
pfg-20121231.xml	Edgar Link	completed
pfg-20121231.xsd	Edgar Link	pending
pfg-20121231_cal.xml	Edgar Link	unprocessable
pfg-20121231_def.xml	Edgar Link	unprocessable
pfg-20121231_lab.xml	Edgar Link	unprocessable
pfg-20121231_pre.xml	Edgar Link	unprocessable
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R111.htm	Edgar Link	pending
R112.htm	Edgar Link	pending
R113.htm	Edgar Link	pending
R114.htm	Edgar Link	pending
R115.htm	Edgar Link	pending
R116.htm	Edgar Link	pending
R117.htm	Edgar Link	pending
R118.htm	Edgar Link	pending
R119.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R120.htm	Edgar Link	pending
R121.htm	Edgar Link	pending
R122.htm	Edgar Link	pending
R123.htm	Edgar Link	pending
R124.htm	Edgar Link	pending
R125.htm	Edgar Link	pending
R126.htm	Edgar Link	pending
R127.htm	Edgar Link	pending
R128.htm	Edgar Link	pending
R129.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R130.htm	Edgar Link	pending
R131.htm	Edgar Link	pending
R132.htm	Edgar Link	pending
R133.htm	Edgar Link	pending
R134.htm	Edgar Link	pending
R135.htm	Edgar Link	pending
R136.htm	Edgar Link	pending
R137.htm	Edgar Link	pending
R138.htm	Edgar Link	pending
R139.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R140.htm	Edgar Link	pending
R141.htm	Edgar Link	pending
R142.htm	Edgar Link	pending
R143.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$PFG
PRINCIPAL FINANCIAL GROUP INC Stock $pfg

2011 Q4 Form 10-K Financial Statement

#000104746913000940 Filed on February 13, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$PFG PRINCIPAL FINANCIAL GROUP INC Stock $pfg

2011 Q4 Form 10-K Financial Statement

#000104746913000940 Filed on February 13, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$PFG
PRINCIPAL FINANCIAL GROUP INC Stock $pfg