$unm 2017 Q4 10-Q

Concept	2017 Q4	2017 Q3	2016 Q3
Revenue	$2.839B	$2.819B	$2.763B
YoY Change	1.53%	2.02%	3.97%
Cost Of Revenue		$1.766B	$1.743B
YoY Change		1.32%	3.06%
Gross Profit		$1.054B	$1.021B
YoY Change		3.21%	5.56%
Gross Profit Margin		37.37%	36.94%
Selling, General & Admin	$199.7M	$221.8M	$210.1M
YoY Change	-5.58%	5.57%	2.04%
% of Gross Profit		21.05%	20.58%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$25.00M	$123.7M	$118.8M
YoY Change	-3.1%	4.12%	1.54%
% of Gross Profit		11.74%	11.64%
Operating Expenses	$2.454B	$2.412B	$2.386B
YoY Change	2.86%	1.1%	2.81%
Operating Profit		-$1.359B	-$1.365B
YoY Change		-0.48%	0.84%
Interest Expense	-$40.10M	-$40.10M	-$45.20M
YoY Change	0.75%	-11.28%	18.64%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$345.3M	$366.8M	$332.1M
YoY Change	-6.98%	10.45%	11.11%
Income Tax	$109.9M	$114.5M	$96.10M
% Of Pretax Income	31.83%	31.22%	28.94%
Net Earnings	$266.9M	$252.3M	$236.0M
YoY Change	7.62%	6.91%	15.8%
Net Earnings / Revenue	9.4%	8.95%	8.54%
Basic Earnings Per Share	$1.19	$1.12	$1.01
Diluted Earnings Per Share	$1.19	$1.12	$1.01
COMMON SHARES
Basic Shares Outstanding	224.4M shares	225.3M shares	233.8M shares
Diluted Shares Outstanding		226.0M shares	234.2M shares

Concept	2017 Q4	2017 Q3	2016 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$77.00M	$70.00M	$88.00M
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	$504.8M	$489.9M	$509.7M
YoY Change	0.84%	-3.88%	-3.76%
Goodwill	$338.6M	$338.2M	$336.8M
YoY Change	1.04%	0.42%	45.11%
Intangibles
YoY Change
Long-Term Investments	$53.03B	$52.82B	$53.07B
YoY Change	3.77%	-0.48%	4.34%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$64.01B	$63.81B	$63.91B
YoY Change	3.34%	-0.16%	3.9%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$199.9M	$200.0M	$0.00
YoY Change			-100.0%
Total Short-Term Liabilities	$599.0M	$639.0M	$440.0M
YoY Change	40.28%	45.23%	-52.28%
LONG-TERM LIABILITIES
Long-Term Debt	$2.738B	$2.754B	$3.020B
YoY Change	-8.7%	-8.81%	36.22%
Other Long-Term Liabilities	$1.727B	$1.699B	$1.450B
YoY Change	3.04%	17.17%	-6.45%
Total Long-Term Liabilities	$2.738B	$4.453B	$4.470B
YoY Change	-8.7%	-0.38%	18.66%
TOTAL LIABILITIES
Total Short-Term Liabilities	$599.0M	$639.0M	$440.0M
Total Long-Term Liabilities	$2.738B	$4.453B	$4.470B
Total Liabilities	$54.44B	$54.36B	$54.54B
YoY Change	2.76%	-0.34%	3.06%
SHAREHOLDERS EQUITY
Retained Earnings	$9.542B	$9.327B	$8.542B
YoY Change	9.13%	9.19%	9.32%
Common Stock	$2.334B	$2.326B	$2.293B
YoY Change	1.33%	1.41%	1.05%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.429B	$2.329B	$1.925B
YoY Change	19.74%	20.95%	26.29%
Treasury Stock Shares	81.90M shares	80.05M shares	71.24M shares
Shareholders Equity	$9.575B	$9.449B	$9.361B
YoY Change
Total Liabilities & Shareholders Equity	$64.01B	$63.81B	$63.91B
YoY Change	3.34%	-0.16%	3.9%

Concept	2017 Q4	2017 Q3	2016 Q3
OPERATING ACTIVITIES
Net Income	$266.9M	$252.3M	$236.0M
YoY Change	7.62%	6.91%	15.8%
Depreciation, Depletion And Amortization	$25.00M	$123.7M	$118.8M
YoY Change	-3.1%	4.12%	1.54%
Cash From Operating Activities	$283.4M	$224.0M	$193.5M
YoY Change	-21.54%	15.76%	-29.12%
INVESTING ACTIVITIES
Capital Expenditures	-$40.60M	-$16.90M	-$18.50M
YoY Change	63.05%	-8.65%	-8.42%
Acquisitions
YoY Change
Other Investing Activities	-$66.10M	-$84.60M	$350.4M
YoY Change	-59.82%	-124.14%	-527.84%
Cash From Investing Activities	-$106.7M	-$101.5M	$331.9M
YoY Change	-43.66%	-130.58%	-425.07%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-169.4M	-169.4M	-531.3M
YoY Change	6.34%	-68.12%	188.44%
NET CHANGE
Cash From Operating Activities	283.4M	224.0M	193.5M
Cash From Investing Activities	-106.7M	-101.5M	331.9M
Cash From Financing Activities	-169.4M	-169.4M	-531.3M
Net Change In Cash	7.300M	-46.90M	-5.900M
YoY Change	-41.6%	694.92%	-55.64%
FREE CASH FLOW
Cash From Operating Activities	$283.4M	$224.0M	$193.5M
Capital Expenditures	-$40.60M	-$16.90M	-$18.50M
Free Cash Flow	$324.0M	$240.9M	$212.0M
YoY Change	-16.08%	13.63%	-27.69%

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	3500000	USD
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Period End Date DocumentPeriodEndDate	2017-09-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0000005513
CY2017Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	224389084	shares
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	Unum Group
	dei	Trading Symbol TradingSymbol	UNM
CY2015Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	1470300000	USD
CY2016Q2	invest	Derivative Notional Amount DerivativeNotionalAmount	1440500000	USD
CY2016Q3	invest	Derivative Notional Amount DerivativeNotionalAmount	1086900000	USD
CY2016Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	1052000000	USD
CY2017Q2	invest	Derivative Notional Amount DerivativeNotionalAmount	1013700000	USD
CY2017Q3	invest	Derivative Notional Amount DerivativeNotionalAmount	911100000	USD
CY2016Q3	unm	Accident And Health Active Life Reserves AccidentAndHealthActiveLifeReserves	10053600000	USD
CY2017Q3	unm	Accident And Health Active Life Reserves AccidentAndHealthActiveLifeReserves	10532400000	USD
CY2016Q3	unm	Amortizationof Low Income Housing Investments AmortizationofLowIncomeHousingInvestments	5800000	USD
	unm	Amortizationof Low Income Housing Investments AmortizationofLowIncomeHousingInvestments	17400000	USD
CY2017Q3	unm	Amortizationof Low Income Housing Investments AmortizationofLowIncomeHousingInvestments	5800000	USD
	unm	Amortizationof Low Income Housing Investments AmortizationofLowIncomeHousingInvestments	17400000	USD
CY2016Q4	unm	Available For Sale Securities Debt Maturities Amortized Cost Gross Subtotal AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostGrossSubtotal	37447800000	USD
CY2017Q3	unm	Available For Sale Securities Debt Maturities Amortized Cost Gross Subtotal AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostGrossSubtotal	37909200000	USD
CY2016Q4	unm	Available For Sale Securities Other Than Temporary Impairments In Accumulated Other Comprehensive Income Loss AvailableForSaleSecuritiesOtherThanTemporaryImpairmentsInAccumulatedOtherComprehensiveIncomeLoss	0	USD
CY2017Q3	unm	Available For Sale Securities Other Than Temporary Impairments In Accumulated Other Comprehensive Income Loss AvailableForSaleSecuritiesOtherThanTemporaryImpairmentsInAccumulatedOtherComprehensiveIncomeLoss	0	USD
CY2016Q3	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance And Net Of Tax Expense Benefit ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit	-135100000	USD
	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance And Net Of Tax Expense Benefit ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit	-1400300000	USD
CY2017Q3	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance And Net Of Tax Expense Benefit ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit	-66900000	USD
	unm	Loan To Value Ratio Update Frequency LoanToValueRatioUpdateFrequency	P3Y
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	400000	shares
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	9500000	USD
CY2017Q3	unm	Mortage Loan Policy Debt Service Coverage Ratio Lower Range MortageLoanPolicyDebtServiceCoverageRatioLowerRange	1.25
	unm	Mortgage Loan Inspection Frequency MortgageLoanInspectionFrequency	P2Y
	unm	Mortgageloanpolicyamortizationperiod Mortgageloanpolicyamortizationperiod	25
CY2016Q3	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense	-51700000	USD
	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense	-707000000	USD
CY2017Q3	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense	-31800000	USD
	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense	-261700000	USD
CY2017Q3	unm	Collateral Requirements Minimum Percentage Collateral To Fair Value Of Securities Loaned Or Purchased Under Repurchase Agreements CollateralRequirementsMinimumPercentageCollateralToFairValueOfSecuritiesLoanedOrPurchasedUnderRepurchaseAgreements	1.02
CY2017Q3	unm	Commitment To Fund Partnership Equity Investments CommitmentToFundPartnershipEquityInvestments	366100000	USD
CY2016Q3	unm	Notional Amount Of Derivatives Additions NotionalAmountOfDerivativesAdditions	3500000	USD
CY2017Q3	unm	Commitment To Fund Private Placement Fixed Maturity Securities CommitmentToFundPrivatePlacementFixedMaturitySecurities	133400000	USD
	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance And Net Of Tax Expense Benefit ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit	-499500000	USD
CY2017Q3	unm	Investment Income On Pfa Assets InvestmentIncomeOnPfaAssets	3500000	USD
	unm	Investment Income On Pfa Assets InvestmentIncomeOnPfaAssets	10600000	USD
CY2016Q3	unm	Life Reserves For Future Policy And Contract Benefits LifeReservesForFuturePolicyAndContractBenefits	8031200000	USD
	unm	Notional Amount Of Derivatives Additions NotionalAmountOfDerivativesAdditions	3500000	USD
CY2017Q3	unm	Life Reserves For Future Policy And Contract Benefits LifeReservesForFuturePolicyAndContractBenefits	8209600000	USD
CY2017Q3	unm	Loan To Value Ratio Maximum LoanToValueRatioMaximum	0.75
CY2017Q3	unm	Notional Amount Of Derivatives Additions NotionalAmountOfDerivativesAdditions	24700000	USD
	unm	Notional Amount Of Derivatives Additions NotionalAmountOfDerivativesAdditions	40700000	USD
CY2017Q3	unm	Committments To Fund Commercial Mortgage Loans CommittmentsToFundCommercialMortgageLoans	93000000	USD
CY2016Q4	unm	Count Of Financing Receivable Recorded Investment Nonaccrual Status CountOfFinancingReceivableRecordedInvestmentNonaccrualStatus	0
CY2017Q3	unm	Count Of Financing Receivable Recorded Investment Nonaccrual Status CountOfFinancingReceivableRecordedInvestmentNonaccrualStatus	0
CY2016Q3	unm	Investment Income On Pfa Assets InvestmentIncomeOnPfaAssets	3500000	USD
	unm	Investment Income On Pfa Assets InvestmentIncomeOnPfaAssets	10700000	USD
CY2016Q3	unm	Notional Amount Of Derivatives Terminations NotionalAmountOfDerivativesTerminations	357100000	USD
	unm	Notional Amount Of Derivatives Terminations NotionalAmountOfDerivativesTerminations	386900000	USD
CY2017Q3	unm	Notional Amount Of Derivatives Terminations NotionalAmountOfDerivativesTerminations	127300000	USD
	unm	Notional Amount Of Derivatives Terminations NotionalAmountOfDerivativesTerminations	181600000	USD
	unm	Number Of Changes To Accounting Policy For Estimating Credit Losses On Mortgage Loans NumberOfChangesToAccountingPolicyForEstimatingCreditLossesOnMortgageLoans	0
CY2016Q3	unm	Other Investments Gross Realized Gains OtherInvestmentsGrossRealizedGains	200000	USD
	unm	Other Investments Gross Realized Gains OtherInvestmentsGrossRealizedGains	4000000	USD
CY2017Q3	unm	Other Investments Gross Realized Gains OtherInvestmentsGrossRealizedGains	800000	USD
	unm	Other Investments Gross Realized Gains OtherInvestmentsGrossRealizedGains	3400000	USD
CY2016Q3	unm	Other Investments Gross Realized Losses OtherInvestmentsGrossRealizedLosses	0	USD
	unm	Other Investments Gross Realized Losses OtherInvestmentsGrossRealizedLosses	700000	USD
CY2017Q3	unm	Other Investments Gross Realized Losses OtherInvestmentsGrossRealizedLosses	0	USD
	unm	Other Investments Gross Realized Losses OtherInvestmentsGrossRealizedLosses	200000	USD
	unm	Outstanding Performance Share Unit Awards Grant Price Range Lower Limit OutstandingPerformanceShareUnitAwardsGrantPriceRangeLowerLimit	27.85
	unm	Outstanding Performance Share Unit Awards Grant Price Range Upper Limit OutstandingPerformanceShareUnitAwardsGrantPriceRangeUpperLimit	49.86
	unm	Outstanding Restricted Stock Unit Grant Prices Lower Limit OutstandingRestrictedStockUnitGrantPricesLowerLimit	27.85
	unm	Outstanding Restricted Stock Unit Grant Prices Upper Limit OutstandingRestrictedStockUnitGrantPricesUpperLimit	49.86
CY2016Q4	unm	Percentage Of Loan Portfolio PercentageOfLoanPortfolio	1.000
CY2017Q3	unm	Percentage Of Loan Portfolio PercentageOfLoanPortfolio	1.000
CY2016Q4	unm	Policy Loans Cededto Reinsurers PolicyLoansCededtoReinsurers	3206100000	USD
CY2017Q3	unm	Policy Loans Cededto Reinsurers PolicyLoansCededtoReinsurers	3306200000	USD
CY2016Q3	unm	Shares Repurchased Cost Commissions SharesRepurchasedCostCommissions	100000	USD
	unm	Shares Repurchased Cost Commissions SharesRepurchasedCostCommissions	200000	USD
CY2017Q3	unm	Shares Repurchased Cost Commissions SharesRepurchasedCostCommissions	100000	USD
	unm	Shares Repurchased Cost Commissions SharesRepurchasedCostCommissions	200000	USD
CY2016Q3	unm	Tax Benefitsfrom Low Income Housing Investments TaxBenefitsfromLowIncomeHousingInvestments	4600000	USD
	unm	Tax Benefitsfrom Low Income Housing Investments TaxBenefitsfromLowIncomeHousingInvestments	13900000	USD
CY2017Q3	unm	Tax Benefitsfrom Low Income Housing Investments TaxBenefitsfromLowIncomeHousingInvestments	4600000	USD
	unm	Tax Benefitsfrom Low Income Housing Investments TaxBenefitsfromLowIncomeHousingInvestments	13900000	USD
CY2017Q3	unm	Unfunded Commitment To Fund Tax Credit Partnership Investments UnfundedCommitmentToFundTaxCreditPartnershipInvestments	4400000	USD
CY2017Q3	unm	Unfunded Unconditional Commitmentto Fund Private Equity Partnerships UnfundedUnconditionalCommitmenttoFundPrivateEquityPartnerships	100000	USD
CY2016Q3	unm	Unrealized Adjustment To Reserves For Future Policy And Contract Benefits UnrealizedAdjustmentToReservesForFuturePolicyAndContractBenefits	5775500000	USD
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	500000	shares
CY2017Q3	unm	Unrealized Adjustment To Reserves For Future Policy And Contract Benefits UnrealizedAdjustmentToReservesForFuturePolicyAndContractBenefits	5057400000	USD
CY2016Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	693300000	USD
CY2017Q3	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	692500000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-51000000	USD
CY2017Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	124300000	USD
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2272800000	USD
CY2017Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2295200000	USD
CY2016Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	500000	shares
CY2017Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	400000	shares
CY2016Q4	us-gaap	Assets Assets	61941500000	USD
CY2017Q3	us-gaap	Assets Assets	63805700000	USD
CY2016Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	39552700000	USD
CY2017Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	39834900000	USD
CY2016Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	44217300000	USD
CY2017Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	45422600000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	63700000	USD
CY2017Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	67600000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	154900000	USD
CY2017Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	43000000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	4667300000	USD
CY2017Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1976700000	USD
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	801900000	USD
CY2017Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	660700000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	10991600000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	11814800000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	6231000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	5531300000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	18886400000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	18813300000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1338800000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1749800000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	2104900000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	1925700000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	44217300000	USD
CY2017Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	45422600000	USD
CY2016Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	1600000	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	29400000	USD
CY2017Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	4300000	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	8600000	USD
CY2016Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	400000	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	14000000	USD
CY2017Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	1200000	USD
CY2016Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	35200000	USD
CY2017Q3	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	50100000	USD
CY2016Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2431200000	USD
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	7273500000	USD
CY2017Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2452300000	USD
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	7388900000	USD
CY2015Q4	us-gaap	Cash Cash	112900000	USD
CY2016Q3	us-gaap	Cash Cash	87900000	USD
CY2016Q4	us-gaap	Cash Cash	100400000	USD
CY2017Q3	us-gaap	Cash Cash	70100000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-25000000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-30300000	USD
	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	62100000	USD
CY2016Q4	us-gaap	Collateralized Financings CollateralizedFinancings	406000000	USD
CY2017Q3	us-gaap	Collateralized Financings CollateralizedFinancings	398300000	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2017Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	725000000	shares
CY2017Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	725000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	303552934	shares
CY2017Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	304416454	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	30400000	USD
CY2017Q3	us-gaap	Common Stock Value CommonStockValue	30400000	USD
CY2016Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	346900000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1118000000	USD
CY2017Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	271700000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	902600000	USD
CY2016Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	84000000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	242700000	USD
CY2017Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	139400000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	301800000	USD
CY2016Q4	us-gaap	Debt Current DebtCurrent	0	USD
CY2017Q3	us-gaap	Debt Current DebtCurrent	199900000	USD
CY2016Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12100000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	50400000	USD
CY2017Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-24900000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	29600000	USD
CY2016Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	118800000	USD
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	377200000	USD
CY2017Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	123700000	USD
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	403500000	USD
CY2016Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	2094200000	USD
CY2017Q3	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	2155300000	USD
	us-gaap	Deferred Policy Acquisition Costs Period Increase Decrease DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease	69800000	USD
	us-gaap	Deferred Policy Acquisition Costs Period Increase Decrease DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease	66600000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	75900000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	78400000	USD
CY2016Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	USD
CY2017Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	130300000	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	231800000	USD
CY2016Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed	211200000	USD
CY2017Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed	190500000	USD
CY2016Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Amount Offset Against Collateral DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral	0	USD
CY2017Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Amount Offset Against Collateral DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral	0	USD
CY2016Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Cash DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash	55300000	USD
CY2017Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Cash DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash	48200000	USD
CY2016Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Securities DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities	155900000	USD
CY2017Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Securities DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities	142300000	USD
CY2016Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Gross DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross	211200000	USD
CY2017Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Gross DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross	190500000	USD
CY2016Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability	0	USD
CY2017Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability	0	USD
CY2016Q4	us-gaap	Derivative Assets DerivativeAssets	32700000	USD
CY2017Q3	us-gaap	Derivative Assets DerivativeAssets	20600000	USD
CY2016Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	25400000	USD
CY2017Q3	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	15900000	USD
CY2016Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	7300000	USD
CY2017Q3	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	4700000	USD
CY2016Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	0	USD
CY2017Q3	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	0	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	32700000	USD
CY2017Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	20600000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	0	USD
CY2017Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	0	USD
CY2016Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	100000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-3500000	USD
CY2017Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	200000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-300000	USD
CY2016Q3	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	13000000	USD
	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	41100000	USD
CY2017Q3	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	9000000	USD
	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	35100000	USD
CY2016Q3	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	300000	USD
	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	-24200000	USD
CY2017Q3	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	-12100000	USD
	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	-21300000	USD
CY2016Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	99500000	USD
CY2017Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	77400000	USD
CY2016Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned	82700000	USD
CY2017Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned	84500000	USD
CY2016Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Amount Offset Against Collateral DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral	15200000	USD
CY2017Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Amount Offset Against Collateral DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral	6200000	USD
CY2016Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Asset DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset	0	USD
CY2017Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Asset DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset	0	USD
CY2016Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Cash DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash	0	USD
CY2017Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Cash DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash	0	USD
CY2016Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Securities DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities	67500000	USD
CY2017Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Securities DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities	78300000	USD
CY2016Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Gross DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross	82700000	USD
CY2017Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Gross DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross	84500000	USD
CY2016Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	52800000	USD
CY2017Q3	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	52200000	USD
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.01
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.89
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.12
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.20
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.88
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.12
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.19
CY2016Q3	us-gaap	Embedded Derivative Gain Loss On Embedded Derivative Net EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	9700000	USD
	us-gaap	Embedded Derivative Gain Loss On Embedded Derivative Net EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	14300000	USD
CY2017Q3	us-gaap	Embedded Derivative Gain Loss On Embedded Derivative Net EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	6700000	USD
	us-gaap	Embedded Derivative Gain Loss On Embedded Derivative Net EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	21500000	USD
CY2016Q4	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch	350000000	USD
CY2017Q3	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch	350000000	USD
CY2016Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	31600000	USD
CY2017Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	34200000	USD
CY2016Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-200000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-100000	USD
CY2017Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-100000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	300000	USD
CY2016Q3	us-gaap	Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet	0	USD
	us-gaap	Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet	0	USD
CY2017Q3	us-gaap	Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet	0	USD
	us-gaap	Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet	0	USD
CY2016Q3	us-gaap	Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet	0	USD
	us-gaap	Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet	0	USD
CY2017Q3	us-gaap	Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet	0	USD
	us-gaap	Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet	0	USD
CY2016Q3	us-gaap	Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet	0	USD
	us-gaap	Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet	0	USD
CY2017Q3	us-gaap	Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet	0	USD
	us-gaap	Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet	0	USD
CY2016Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	11000000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-4200000	USD
CY2017Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	9800000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	28900000	USD
CY2016Q3	us-gaap	Gain Loss On Investments Excluding Other Than Temporary Impairments GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments	11000000	USD
	us-gaap	Gain Loss On Investments Excluding Other Than Temporary Impairments GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments	26300000	USD
CY2017Q3	us-gaap	Gain Loss On Investments Excluding Other Than Temporary Impairments GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments	9800000	USD
	us-gaap	Gain Loss On Investments Excluding Other Than Temporary Impairments GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments	28900000	USD
CY2016Q3	us-gaap	Gain On Cash Flow Hedge Ineffectiveness GainOnCashFlowHedgeIneffectiveness	0	USD
	us-gaap	Gain On Cash Flow Hedge Ineffectiveness GainOnCashFlowHedgeIneffectiveness	0	USD
CY2017Q3	us-gaap	Gain On Cash Flow Hedge Ineffectiveness GainOnCashFlowHedgeIneffectiveness	0	USD
	us-gaap	Gain On Cash Flow Hedge Ineffectiveness GainOnCashFlowHedgeIneffectiveness	0	USD
CY2016Q3	us-gaap	Gain On Fair Value Hedge Ineffectiveness GainOnFairValueHedgeIneffectiveness	0	USD
	us-gaap	Gain On Fair Value Hedge Ineffectiveness GainOnFairValueHedgeIneffectiveness	0	USD
CY2017Q3	us-gaap	Gain On Fair Value Hedge Ineffectiveness GainOnFairValueHedgeIneffectiveness	0	USD
	us-gaap	Gain On Fair Value Hedge Ineffectiveness GainOnFairValueHedgeIneffectiveness	0	USD
CY2016Q4	us-gaap	Goodwill Goodwill	335100000	USD
CY2017Q3	us-gaap	Goodwill Goodwill	338200000	USD
CY2016Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	3600000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	3000000	USD
CY2017Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	0	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	0	USD
CY2016Q3	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	0	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	0	USD
CY2017Q3	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	0	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	0	USD
CY2016Q3	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	5400000	USD
CY2016Q3	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
	us-gaap	Impairment Of Investments ImpairmentOfInvestments	3100000	USD
CY2017Q3	us-gaap	Impairment Of Investments ImpairmentOfInvestments	900000	USD
	us-gaap	Impairment Of Investments ImpairmentOfInvestments	900000	USD
CY2016Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	332100000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	976500000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	366800000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1058700000	USD
CY2016Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	96100000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	293100000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	114500000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	331400000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-800000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	81400000	USD
	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	135000000	USD
	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	145700000	USD
	us-gaap	Increase Decrease In Cash Collateral For Loaned Securities IncreaseDecreaseInCashCollateralForLoanedSecurities	24700000	USD
	us-gaap	Increase Decrease In Cash Collateral For Loaned Securities IncreaseDecreaseInCashCollateralForLoanedSecurities	-7700000	USD
CY2016Q3	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	147800000	USD
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	447000000	USD
CY2017Q3	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	154800000	USD
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	470100000	USD
	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	274100000	USD
	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	348100000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-37600000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-6600000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	65700000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	119000000	USD
CY2016Q3	us-gaap	Insurance Commissions InsuranceCommissions	256800000	USD
	us-gaap	Insurance Commissions InsuranceCommissions	771700000	USD
CY2017Q3	us-gaap	Insurance Commissions InsuranceCommissions	262400000	USD
	us-gaap	Insurance Commissions InsuranceCommissions	793900000	USD
CY2016Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	45200000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	126200000	USD
CY2017Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	40100000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	119800000	USD
CY2016Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	622300000	USD
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	1875300000	USD
CY2017Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	619600000	USD
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	1866500000	USD
CY2016Q3	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	7400000	USD
	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	23500000	USD
CY2017Q3	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	7100000	USD
	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	24000000	USD
CY2016Q3	us-gaap	Investment Tax Credit InvestmentTaxCredit	10400000	USD
	us-gaap	Investment Tax Credit InvestmentTaxCredit	31300000	USD
CY2017Q3	us-gaap	Investment Tax Credit InvestmentTaxCredit	10400000	USD
	us-gaap	Investment Tax Credit InvestmentTaxCredit	31300000	USD
CY2016Q4	us-gaap	Investments Investments	51130900000	USD
CY2017Q3	us-gaap	Investments Investments	52836400000	USD
CY2016Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	210100000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	620600000	USD
CY2017Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	221800000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	644700000	USD
CY2017Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	2100000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	52973500000	USD
CY2017Q3	us-gaap	Liabilities Liabilities	54357100000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	61941500000	USD
CY2017Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	63805700000	USD
CY2015Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23796100000	USD
CY2016Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23368300000	USD
CY2016Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23249500000	USD
CY2017Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23196500000	USD
CY2016Q3	us-gaap	Liability For Claims And Claims Adjustment Expense Disability Accident And Health LiabilityForClaimsAndClaimsAdjustmentExpenseDisabilityAccidentAndHealth	1483500000	USD
CY2016Q4	us-gaap	Liability For Claims And Claims Adjustment Expense Disability Accident And Health LiabilityForClaimsAndClaimsAdjustmentExpenseDisabilityAccidentAndHealth	1507900000	USD
CY2017Q3	us-gaap	Liability For Claims And Claims Adjustment Expense Disability Accident And Health LiabilityForClaimsAndClaimsAdjustmentExpenseDisabilityAccidentAndHealth	1539000000	USD
CY2016Q3	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	47228600000	USD
CY2017Q3	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	46995900000	USD
CY2016Q3	us-gaap	Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense	45745100000	USD
CY2016Q4	us-gaap	Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense	44245900000	USD
CY2017Q3	us-gaap	Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense	45456900000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	1370300000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	1463900000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	3504400000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	3478800000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	4455900000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	4889400000	USD
CY2015Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	21731500000	USD
CY2016Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	21312700000	USD
CY2016Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	21085900000	USD
CY2017Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	21032600000	USD
CY2017Q3	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2016Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	2999400000	USD
CY2017Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	2754100000	USD
CY2016Q4	us-gaap	Marketable Securities Equity Securities MarketableSecuritiesEquitySecurities	1200000	USD
CY2017Q3	us-gaap	Marketable Securities Equity Securities MarketableSecuritiesEquitySecurities	1300000	USD
CY2016Q3	us-gaap	Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	0	USD
	us-gaap	Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	30500000	USD
CY2017Q3	us-gaap	Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	0	USD
	us-gaap	Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	0	USD
CY2016Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2038900000	USD
CY2017Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2145300000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-259300000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-518400000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-520600000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-377900000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	754900000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	866000000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	236000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	683400000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	252300000	USD
	us-gaap	Net Income Loss NetIncomeLoss	727300000	USD
CY2016Q3	us-gaap	Net Investment Income NetInvestmentIncome	611400000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	1841100000	USD
CY2017Q3	us-gaap	Net Investment Income NetInvestmentIncome	609000000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	1831900000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	Integer
CY2016Q4	us-gaap	Other Assets OtherAssets	617300000	USD
CY2017Q3	us-gaap	Other Assets OtherAssets	631900000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	277200000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1999200000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	66100000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	616300000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	113900000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	1008100000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	39200000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	334700000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	117700000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	443700000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	27300000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	197400000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-8400000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-42800000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-13800000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-36800000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-4300000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-22300000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-7400000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-19700000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-25800000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-131600000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	31800000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	88700000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	110900000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	434600000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	19400000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	175300000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-10100000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-2200000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-6600000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1700000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-5300000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1500000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-4300000	USD
CY2016Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	205500000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	618900000	USD
CY2017Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	193500000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	630500000	USD
CY2016Q3	us-gaap	Other Income OtherIncome	51500000	USD
	us-gaap	Other Income OtherIncome	154600000	USD
CY2017Q3	us-gaap	Other Income OtherIncome	46700000	USD
	us-gaap	Other Income OtherIncome	148100000	USD
CY2016Q4	us-gaap	Other Liabilities OtherLiabilities	1675900000	USD
CY2017Q3	us-gaap	Other Liabilities OtherLiabilities	1699400000	USD
CY2016Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	631500000	USD
CY2017Q3	us-gaap	Other Long Term Investments OtherLongTermInvestments	654500000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-26200000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	2400000	USD
CY2016Q4	us-gaap	Other Policyholder Funds OtherPolicyholderFunds	1623800000	USD
CY2017Q3	us-gaap	Other Policyholder Funds OtherPolicyholderFunds	1606900000	USD
CY2016Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	780000000	USD
CY2017Q3	us-gaap	Other Short Term Investments OtherShortTermInvestments	1046500000	USD
CY2016Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	0	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	30500000	USD
CY2017Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	0	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	0	USD
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	4874700000	USD
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	4942700000	USD
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-38600000	USD
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	252600000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	309100000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	307200000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	136200000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	144100000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2452300000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2063400000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	128500000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	431400000	USD
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	313500000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	60100000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	64700000	USD
CY2016Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1742600000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	5205900000	USD
CY2017Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1765600000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	5266600000	USD
CY2017Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.10
CY2017Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	25000000	shares
CY2017Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q4	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	1610800000	USD
CY2017Q3	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	1697700000	USD
CY2016Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	2089400000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	6258500000	USD
CY2017Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	2153600000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	6438700000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	3600000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	609100000	USD

us-gaap

Available For Sale Securities Gross Realized Losses

AvailableForSaleSecuritiesGrossRealizedLosses

3500000

USD

dei

Current Fiscal Year End Date

CurrentFiscalYearEndDate

--12-31

dei

Document Fiscal Period Focus

DocumentFiscalPeriodFocus

Q3

dei

Document Fiscal Year Focus

DocumentFiscalYearFocus

2017

dei

Amendment Flag

AmendmentFlag

false

dei

Document Period End Date

DocumentPeriodEndDate

2017-09-30

dei

Document Type

DocumentType

10-Q

dei

Entity Central Index Key

EntityCentralIndexKey

0000005513

CY2017Q4

dei

Entity Common Stock Shares Outstanding

EntityCommonStockSharesOutstanding

224389084

shares

dei

Entity Filer Category

EntityFilerCategory

Large Accelerated Filer

dei

Entity Registrant Name

EntityRegistrantName

Unum Group

dei

Trading Symbol

TradingSymbol

UNM

CY2015Q4

invest

Derivative Notional Amount

DerivativeNotionalAmount

1470300000

USD

CY2016Q2

invest

Derivative Notional Amount

DerivativeNotionalAmount

1440500000

USD

CY2016Q3

invest

Derivative Notional Amount

DerivativeNotionalAmount

1086900000

USD

CY2016Q4

invest

Derivative Notional Amount

DerivativeNotionalAmount

1052000000

USD

CY2017Q2

invest

Derivative Notional Amount

DerivativeNotionalAmount

1013700000

USD

CY2017Q3

invest

Derivative Notional Amount

DerivativeNotionalAmount

911100000

USD

CY2016Q3

unm

Accident And Health Active Life Reserves

AccidentAndHealthActiveLifeReserves

10053600000

USD

CY2017Q3

unm

Accident And Health Active Life Reserves

AccidentAndHealthActiveLifeReserves

10532400000

USD

CY2016Q3

unm

Amortizationof Low Income Housing Investments

AmortizationofLowIncomeHousingInvestments

5800000

USD

unm

Amortizationof Low Income Housing Investments

AmortizationofLowIncomeHousingInvestments

17400000

USD

CY2017Q3

unm

Amortizationof Low Income Housing Investments

AmortizationofLowIncomeHousingInvestments

5800000

USD

unm

Amortizationof Low Income Housing Investments

AmortizationofLowIncomeHousingInvestments

17400000

USD

CY2016Q4

unm

Available For Sale Securities Debt Maturities Amortized Cost Gross Subtotal

AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostGrossSubtotal

37447800000

USD

CY2017Q3

unm

Available For Sale Securities Debt Maturities Amortized Cost Gross Subtotal

AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostGrossSubtotal

37909200000

USD

CY2016Q4

unm

Available For Sale Securities Other Than Temporary Impairments In Accumulated Other Comprehensive Income Loss

AvailableForSaleSecuritiesOtherThanTemporaryImpairmentsInAccumulatedOtherComprehensiveIncomeLoss

0

USD

CY2017Q3

unm

Available For Sale Securities Other Than Temporary Impairments In Accumulated Other Comprehensive Income Loss

AvailableForSaleSecuritiesOtherThanTemporaryImpairmentsInAccumulatedOtherComprehensiveIncomeLoss

0

USD

CY2016Q3

unm

Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance And Net Of Tax Expense Benefit

ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit

-135100000

USD

unm

Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance And Net Of Tax Expense Benefit

ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit

-1400300000

USD

CY2017Q3

unm

Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance And Net Of Tax Expense Benefit

ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit

-66900000

USD

unm

Loan To Value Ratio Update Frequency

LoanToValueRatioUpdateFrequency

P3Y

us-gaap

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

400000

shares

us-gaap

Proceeds From Issuance Of Common Stock

ProceedsFromIssuanceOfCommonStock

9500000

USD

CY2017Q3

unm

Mortage Loan Policy Debt Service Coverage Ratio Lower Range

MortageLoanPolicyDebtServiceCoverageRatioLowerRange

1.25

unm

Mortgage Loan Inspection Frequency

MortgageLoanInspectionFrequency

P2Y

unm

Mortgageloanpolicyamortizationperiod

25

CY2016Q3

unm

Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense

ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense

-51700000

USD

unm

Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense

ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense

-707000000

USD

CY2017Q3

unm

Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense

ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense

-31800000

USD

unm

Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense

ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense

-261700000

USD

CY2017Q3

unm

Collateral Requirements Minimum Percentage Collateral To Fair Value Of Securities Loaned Or Purchased Under Repurchase Agreements

CollateralRequirementsMinimumPercentageCollateralToFairValueOfSecuritiesLoanedOrPurchasedUnderRepurchaseAgreements

1.02

CY2017Q3

unm

Commitment To Fund Partnership Equity Investments

CommitmentToFundPartnershipEquityInvestments

366100000

USD

CY2016Q3

unm

Notional Amount Of Derivatives Additions

NotionalAmountOfDerivativesAdditions

3500000

USD

CY2017Q3

unm

Commitment To Fund Private Placement Fixed Maturity Securities

CommitmentToFundPrivatePlacementFixedMaturitySecurities

133400000

USD

unm

Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance And Net Of Tax Expense Benefit

ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit

-499500000

USD

CY2017Q3

unm

Investment Income On Pfa Assets

InvestmentIncomeOnPfaAssets

3500000

USD

unm

Investment Income On Pfa Assets

InvestmentIncomeOnPfaAssets

10600000

USD

CY2016Q3

unm

Life Reserves For Future Policy And Contract Benefits

LifeReservesForFuturePolicyAndContractBenefits

8031200000

USD

unm

Notional Amount Of Derivatives Additions

NotionalAmountOfDerivativesAdditions

3500000

USD

CY2017Q3

unm

Life Reserves For Future Policy And Contract Benefits

LifeReservesForFuturePolicyAndContractBenefits

8209600000

USD

CY2017Q3

unm

Loan To Value Ratio Maximum

LoanToValueRatioMaximum

0.75

CY2017Q3

unm

Notional Amount Of Derivatives Additions

NotionalAmountOfDerivativesAdditions

24700000

USD

unm

Notional Amount Of Derivatives Additions

NotionalAmountOfDerivativesAdditions

40700000

USD

CY2017Q3

unm

Committments To Fund Commercial Mortgage Loans

CommittmentsToFundCommercialMortgageLoans

93000000

USD

CY2016Q4

unm

Count Of Financing Receivable Recorded Investment Nonaccrual Status

CountOfFinancingReceivableRecordedInvestmentNonaccrualStatus

0

CY2017Q3

unm

Count Of Financing Receivable Recorded Investment Nonaccrual Status

CountOfFinancingReceivableRecordedInvestmentNonaccrualStatus

0

CY2016Q3

unm

Investment Income On Pfa Assets

InvestmentIncomeOnPfaAssets

3500000

USD

unm

Investment Income On Pfa Assets

InvestmentIncomeOnPfaAssets

10700000

USD

CY2016Q3

unm

Notional Amount Of Derivatives Terminations

NotionalAmountOfDerivativesTerminations

357100000

USD

unm

Notional Amount Of Derivatives Terminations

NotionalAmountOfDerivativesTerminations

386900000

USD

CY2017Q3

unm

Notional Amount Of Derivatives Terminations

NotionalAmountOfDerivativesTerminations

127300000

USD

unm

Notional Amount Of Derivatives Terminations

NotionalAmountOfDerivativesTerminations

181600000

USD

unm

Number Of Changes To Accounting Policy For Estimating Credit Losses On Mortgage Loans

NumberOfChangesToAccountingPolicyForEstimatingCreditLossesOnMortgageLoans

0

CY2016Q3

unm

Other Investments Gross Realized Gains

OtherInvestmentsGrossRealizedGains

200000

USD

unm

Other Investments Gross Realized Gains

OtherInvestmentsGrossRealizedGains

4000000

USD

CY2017Q3

unm

Other Investments Gross Realized Gains

OtherInvestmentsGrossRealizedGains

800000

USD

unm

Other Investments Gross Realized Gains

OtherInvestmentsGrossRealizedGains

3400000

USD

CY2016Q3

unm

Other Investments Gross Realized Losses

OtherInvestmentsGrossRealizedLosses

0

USD

unm

Other Investments Gross Realized Losses

OtherInvestmentsGrossRealizedLosses

700000

USD

CY2017Q3

unm

Other Investments Gross Realized Losses

OtherInvestmentsGrossRealizedLosses

0

USD

unm

Other Investments Gross Realized Losses

OtherInvestmentsGrossRealizedLosses

200000

USD

unm

Outstanding Performance Share Unit Awards Grant Price Range Lower Limit

OutstandingPerformanceShareUnitAwardsGrantPriceRangeLowerLimit

27.85

unm

Outstanding Performance Share Unit Awards Grant Price Range Upper Limit

OutstandingPerformanceShareUnitAwardsGrantPriceRangeUpperLimit

49.86

unm

Outstanding Restricted Stock Unit Grant Prices Lower Limit

OutstandingRestrictedStockUnitGrantPricesLowerLimit

27.85

unm

Outstanding Restricted Stock Unit Grant Prices Upper Limit

OutstandingRestrictedStockUnitGrantPricesUpperLimit

49.86

CY2016Q4

unm

Percentage Of Loan Portfolio

PercentageOfLoanPortfolio

1.000

CY2017Q3

unm

Percentage Of Loan Portfolio

PercentageOfLoanPortfolio

1.000

CY2016Q4

unm

Policy Loans Cededto Reinsurers

PolicyLoansCededtoReinsurers

3206100000

USD

CY2017Q3

unm

Policy Loans Cededto Reinsurers

PolicyLoansCededtoReinsurers

3306200000

USD

CY2016Q3

unm

Shares Repurchased Cost Commissions

SharesRepurchasedCostCommissions

100000

USD

unm

Shares Repurchased Cost Commissions

SharesRepurchasedCostCommissions

200000

USD

CY2017Q3

unm

Shares Repurchased Cost Commissions

SharesRepurchasedCostCommissions

100000

USD

unm

Shares Repurchased Cost Commissions

SharesRepurchasedCostCommissions

200000

USD

CY2016Q3

unm

Tax Benefitsfrom Low Income Housing Investments

TaxBenefitsfromLowIncomeHousingInvestments

4600000

USD

unm

Tax Benefitsfrom Low Income Housing Investments

TaxBenefitsfromLowIncomeHousingInvestments

13900000

USD

CY2017Q3

unm

Tax Benefitsfrom Low Income Housing Investments

TaxBenefitsfromLowIncomeHousingInvestments

4600000

USD

unm

Tax Benefitsfrom Low Income Housing Investments

TaxBenefitsfromLowIncomeHousingInvestments

13900000

USD

CY2017Q3

unm

Unfunded Commitment To Fund Tax Credit Partnership Investments

UnfundedCommitmentToFundTaxCreditPartnershipInvestments

4400000

USD

CY2017Q3

unm

Unfunded Unconditional Commitmentto Fund Private Equity Partnerships

UnfundedUnconditionalCommitmenttoFundPrivateEquityPartnerships

100000

USD

CY2016Q3

unm

Unrealized Adjustment To Reserves For Future Policy And Contract Benefits

UnrealizedAdjustmentToReservesForFuturePolicyAndContractBenefits

5775500000

USD

us-gaap

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

500000

shares

CY2017Q3

unm

Unrealized Adjustment To Reserves For Future Policy And Contract Benefits

UnrealizedAdjustmentToReservesForFuturePolicyAndContractBenefits

5057400000

USD

CY2016Q4

us-gaap

Accrued Investment Income Receivable

AccruedInvestmentIncomeReceivable

693300000

USD

CY2017Q3

us-gaap

Accrued Investment Income Receivable

AccruedInvestmentIncomeReceivable

692500000

USD

CY2016Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

-51000000

USD

CY2017Q3

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

124300000

USD

CY2016Q4

us-gaap

Additional Paid In Capital Common Stock

AdditionalPaidInCapitalCommonStock

2272800000

USD

CY2017Q3

us-gaap

Additional Paid In Capital Common Stock

AdditionalPaidInCapitalCommonStock

2295200000

USD

CY2016Q3

us-gaap

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

500000

shares

CY2017Q3

us-gaap

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

400000

shares

CY2016Q4

us-gaap

Assets

61941500000

USD

CY2017Q3

us-gaap

Assets

63805700000

USD

CY2016Q4

us-gaap

Available For Sale Debt Securities Amortized Cost Basis

AvailableForSaleDebtSecuritiesAmortizedCostBasis

39552700000

USD

CY2017Q3

us-gaap

Available For Sale Debt Securities Amortized Cost Basis

AvailableForSaleDebtSecuritiesAmortizedCostBasis

39834900000

USD

CY2016Q4

us-gaap

Available For Sale Securities

AvailableForSaleSecurities

44217300000

USD

CY2017Q3

us-gaap

Available For Sale Securities

AvailableForSaleSecurities

45422600000

USD

CY2016Q4

us-gaap

Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss

AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

63700000

USD

CY2017Q3

us-gaap

Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss

AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

67600000

USD

CY2016Q4

us-gaap

Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss

AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

154900000

USD

CY2017Q3

us-gaap

Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss

AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss

43000000

USD

CY2016Q4

us-gaap

Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value

AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue

4667300000

USD

CY2017Q3

us-gaap

Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value

AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue

1976700000

USD

CY2016Q4

us-gaap

Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value

AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue

801900000

USD

CY2017Q3

us-gaap

Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value

AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue

660700000

USD

CY2016Q4

us-gaap

Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost

AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost

10991600000

USD

CY2017Q3

us-gaap

Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost

AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost

11814800000

USD

CY2016Q4

us-gaap

Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost

AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost

6231000000

USD

CY2017Q3

us-gaap

Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost

AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost

5531300000

USD

CY2016Q4

us-gaap

Available For Sale Securities Debt Maturities After Ten Years Amortized Cost

AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost

18886400000

USD

CY2017Q3

us-gaap

Available For Sale Securities Debt Maturities After Ten Years Amortized Cost

AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost

18813300000

USD

CY2016Q4

us-gaap

Available For Sale Securities Debt Maturities Within One Year Amortized Cost

AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

1338800000

USD

CY2017Q3

us-gaap

Available For Sale Securities Debt Maturities Within One Year Amortized Cost

AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

1749800000

USD

CY2016Q4

us-gaap

Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost

AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost

2104900000

USD

CY2017Q3

us-gaap

Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost

AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost

1925700000

USD

CY2016Q4

us-gaap

Available For Sale Securities Debt Securities

AvailableForSaleSecuritiesDebtSecurities

44217300000

USD

CY2017Q3

us-gaap

Available For Sale Securities Debt Securities

AvailableForSaleSecuritiesDebtSecurities

45422600000

USD

CY2016Q3

us-gaap

Available For Sale Securities Gross Realized Gains

AvailableForSaleSecuritiesGrossRealizedGains

1600000

USD

us-gaap

Available For Sale Securities Gross Realized Gains

AvailableForSaleSecuritiesGrossRealizedGains

29400000

USD

CY2017Q3

us-gaap

Available For Sale Securities Gross Realized Gains

AvailableForSaleSecuritiesGrossRealizedGains

4300000

USD

us-gaap

Available For Sale Securities Gross Realized Gains

AvailableForSaleSecuritiesGrossRealizedGains

8600000

USD

CY2016Q3

us-gaap

Available For Sale Securities Gross Realized Losses

AvailableForSaleSecuritiesGrossRealizedLosses

400000

USD

us-gaap

Available For Sale Securities Gross Realized Losses

AvailableForSaleSecuritiesGrossRealizedLosses

14000000

USD

CY2017Q3

us-gaap

Available For Sale Securities Gross Realized Losses

AvailableForSaleSecuritiesGrossRealizedLosses

1200000

USD

CY2016Q4

us-gaap

Available For Sale Securities Pledged As Collateral

AvailableForSaleSecuritiesPledgedAsCollateral

35200000

USD

CY2017Q3

us-gaap

Available For Sale Securities Pledged As Collateral

AvailableForSaleSecuritiesPledgedAsCollateral

50100000

USD

CY2016Q3

us-gaap

Benefits Losses And Expenses

BenefitsLossesAndExpenses

2431200000

USD

us-gaap

Benefits Losses And Expenses

BenefitsLossesAndExpenses

7273500000

USD

CY2017Q3

us-gaap

Benefits Losses And Expenses

BenefitsLossesAndExpenses

2452300000

USD

us-gaap

Benefits Losses And Expenses

BenefitsLossesAndExpenses

7388900000

USD

CY2015Q4

us-gaap

Cash

112900000

USD

CY2016Q3

us-gaap

Cash

87900000

USD

CY2016Q4

us-gaap

Cash

100400000

USD

CY2017Q3

us-gaap

Cash

70100000

USD

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

-25000000

USD

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

-30300000

USD

us-gaap

Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months

CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

62100000

USD

CY2016Q4

us-gaap

Collateralized Financings

CollateralizedFinancings

406000000

USD

CY2017Q3

us-gaap

Collateralized Financings

CollateralizedFinancings

398300000

USD

CY2016Q4

us-gaap

Commitments And Contingencies

CommitmentsAndContingencies

USD

CY2017Q3

us-gaap

Commitments And Contingencies

CommitmentsAndContingencies

USD

CY2016Q4

us-gaap

Common Stock Par Or Stated Value Per Share

CommonStockParOrStatedValuePerShare

0.10

CY2017Q3

us-gaap

Common Stock Par Or Stated Value Per Share

CommonStockParOrStatedValuePerShare

0.10

CY2016Q4

us-gaap

Common Stock Shares Authorized

CommonStockSharesAuthorized

725000000

shares

CY2017Q3

us-gaap

Common Stock Shares Authorized

CommonStockSharesAuthorized

725000000

shares

CY2016Q4

us-gaap

Common Stock Shares Issued

CommonStockSharesIssued

303552934

shares

CY2017Q3

us-gaap

Common Stock Shares Issued

CommonStockSharesIssued

304416454

shares

CY2016Q4

us-gaap

Common Stock Value

CommonStockValue

30400000

USD

CY2017Q3

us-gaap

Common Stock Value

CommonStockValue

30400000

USD

CY2016Q3

us-gaap

Comprehensive Income Net Of Tax

ComprehensiveIncomeNetOfTax

346900000

USD

us-gaap

Comprehensive Income Net Of Tax

ComprehensiveIncomeNetOfTax

1118000000

USD

CY2017Q3

us-gaap

Comprehensive Income Net Of Tax

ComprehensiveIncomeNetOfTax

271700000

USD

us-gaap

Comprehensive Income Net Of Tax

ComprehensiveIncomeNetOfTax

902600000

USD

CY2016Q3

us-gaap

Current Income Tax Expense Benefit

CurrentIncomeTaxExpenseBenefit

84000000

USD

us-gaap

Current Income Tax Expense Benefit

CurrentIncomeTaxExpenseBenefit

242700000

USD

CY2017Q3

us-gaap

Current Income Tax Expense Benefit

CurrentIncomeTaxExpenseBenefit

139400000

USD

us-gaap

Current Income Tax Expense Benefit

CurrentIncomeTaxExpenseBenefit

301800000

USD

CY2016Q4

us-gaap

Debt Current

DebtCurrent

0

USD

CY2017Q3

us-gaap

Debt Current

DebtCurrent

199900000

USD

CY2016Q3

us-gaap

Deferred Income Tax Expense Benefit

DeferredIncomeTaxExpenseBenefit

12100000

USD

us-gaap

Deferred Income Tax Expense Benefit

DeferredIncomeTaxExpenseBenefit

50400000

USD

CY2017Q3

us-gaap

Deferred Income Tax Expense Benefit

DeferredIncomeTaxExpenseBenefit

-24900000

USD

us-gaap

Deferred Income Tax Expense Benefit

DeferredIncomeTaxExpenseBenefit

29600000

USD

CY2016Q3

us-gaap

Deferred Policy Acquisition Cost Amortization Expense

DeferredPolicyAcquisitionCostAmortizationExpense

118800000

USD

us-gaap

Deferred Policy Acquisition Cost Amortization Expense

DeferredPolicyAcquisitionCostAmortizationExpense

377200000

USD

CY2017Q3

us-gaap

Deferred Policy Acquisition Cost Amortization Expense

DeferredPolicyAcquisitionCostAmortizationExpense

123700000

USD

us-gaap

Deferred Policy Acquisition Cost Amortization Expense

DeferredPolicyAcquisitionCostAmortizationExpense

403500000

USD

CY2016Q4

us-gaap

Deferred Policy Acquisition Costs

DeferredPolicyAcquisitionCosts

2094200000

USD

CY2017Q3

us-gaap

Deferred Policy Acquisition Costs

DeferredPolicyAcquisitionCosts

2155300000

USD

us-gaap

Deferred Policy Acquisition Costs Period Increase Decrease

DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease

69800000

USD

us-gaap

Deferred Policy Acquisition Costs Period Increase Decrease

DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease

66600000

USD

us-gaap

Depreciation Amortization And Accretion Net

DepreciationAmortizationAndAccretionNet

75900000

USD

us-gaap

Depreciation Amortization And Accretion Net

DepreciationAmortizationAndAccretionNet

78400000

USD

CY2016Q4

us-gaap

Derivative Asset Fair Value Gross Liability

DerivativeAssetFairValueGrossLiability

0

USD

CY2017Q3

us-gaap

Derivative Asset Fair Value Gross Liability

DerivativeAssetFairValueGrossLiability

0

USD

CY2016Q4

us-gaap

Deferred Tax Liabilities

DeferredTaxLiabilities

130300000

USD

CY2017Q3

us-gaap

Deferred Tax Liabilities

DeferredTaxLiabilities

231800000

USD

CY2016Q4

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed

211200000

USD

CY2017Q3

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed

190500000

USD

CY2016Q4

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Amount Offset Against Collateral

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral

0

USD

CY2017Q3

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Amount Offset Against Collateral

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral

0

USD

CY2016Q4

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Cash

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash

55300000

USD

CY2017Q3

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Cash

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash

48200000

USD

CY2016Q4

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Securities

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities

155900000

USD

CY2017Q3

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Securities

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities

142300000

USD

CY2016Q4

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Gross

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross

211200000

USD

CY2017Q3

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Gross

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross

190500000

USD

CY2016Q4

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability

0

USD

CY2017Q3

us-gaap

Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability

DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability

0

USD

CY2016Q4

us-gaap

Derivative Assets

DerivativeAssets

32700000

USD

CY2017Q3

us-gaap

Derivative Assets

DerivativeAssets

20600000

USD

CY2016Q4

us-gaap

Derivative Collateral Obligation To Return Cash

DerivativeCollateralObligationToReturnCash

25400000

USD

CY2017Q3

us-gaap

Derivative Collateral Obligation To Return Cash

DerivativeCollateralObligationToReturnCash

15900000

USD

CY2016Q4

us-gaap

Derivative Collateral Obligation To Return Securities

DerivativeCollateralObligationToReturnSecurities

7300000

USD

CY2017Q3

us-gaap

Derivative Collateral Obligation To Return Securities

DerivativeCollateralObligationToReturnSecurities

4700000

USD

CY2016Q4

us-gaap

Derivative Collateral Right To Reclaim Cash

DerivativeCollateralRightToReclaimCash

0

USD

CY2017Q3

us-gaap

Derivative Collateral Right To Reclaim Cash

DerivativeCollateralRightToReclaimCash

0

USD

CY2016Q4

us-gaap

Derivative Fair Value Of Derivative Asset

DerivativeFairValueOfDerivativeAsset

32700000

USD

CY2017Q3

us-gaap

Derivative Fair Value Of Derivative Asset

DerivativeFairValueOfDerivativeAsset

20600000

USD

CY2016Q4

us-gaap

Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral

DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral

0

USD

CY2017Q3

us-gaap

Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral

DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral

0

USD

CY2016Q3

us-gaap

Derivative Gain Loss On Derivative Net

DerivativeGainLossOnDerivativeNet

100000

USD

us-gaap

Derivative Gain Loss On Derivative Net

DerivativeGainLossOnDerivativeNet

-3500000

USD

CY2017Q3

us-gaap

Derivative Gain Loss On Derivative Net

DerivativeGainLossOnDerivativeNet

200000

USD

us-gaap

Derivative Gain Loss On Derivative Net

DerivativeGainLossOnDerivativeNet

-300000

USD

CY2016Q3

us-gaap

Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net

DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

13000000

USD

us-gaap

Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net

DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

41100000

USD

CY2017Q3

us-gaap

Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net

DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

9000000

USD

us-gaap

Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net

DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

35100000

USD

CY2016Q3

us-gaap

Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net

DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet

300000

USD

us-gaap

Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net

DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet

-24200000

USD

CY2017Q3

us-gaap

Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net

DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet

-12100000

USD

us-gaap

Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net

DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet

-21300000

USD

CY2016Q4

us-gaap

Derivative Liabilities

DerivativeLiabilities

99500000

USD

CY2017Q3

us-gaap

Derivative Liabilities

DerivativeLiabilities

77400000

USD

CY2016Q4

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned

82700000

USD

CY2017Q3

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned

84500000

USD

CY2016Q4

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Amount Offset Against Collateral

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral

15200000

USD

CY2017Q3

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Amount Offset Against Collateral

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral

6200000

USD

CY2016Q4

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Asset

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset

0

USD

CY2017Q3

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Asset

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset

0

USD

CY2016Q4

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Cash

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash

0

USD

CY2017Q3

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Cash

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash

0

USD

CY2016Q4

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Securities

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities

67500000

USD

CY2017Q3

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Securities

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities

78300000

USD

CY2016Q4

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Gross

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross

82700000

USD

CY2017Q3

us-gaap

Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Gross

DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross

84500000

USD

CY2016Q4

us-gaap

Derivative Net Liability Position Aggregate Fair Value

DerivativeNetLiabilityPositionAggregateFairValue

52800000

USD

CY2017Q3

us-gaap

Derivative Net Liability Position Aggregate Fair Value

DerivativeNetLiabilityPositionAggregateFairValue

52200000

USD

CY2016Q3

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

1.01

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

2.89

CY2017Q3

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

1.12

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

3.20

CY2016Q3

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

1.01

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

2.88

CY2017Q3

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

1.12

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

3.19

CY2016Q3

us-gaap

Embedded Derivative Gain Loss On Embedded Derivative Net

EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet

9700000

USD

us-gaap

Embedded Derivative Gain Loss On Embedded Derivative Net

EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet

14300000

USD

CY2017Q3

us-gaap

Embedded Derivative Gain Loss On Embedded Derivative Net

EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet

6700000

USD

us-gaap

Embedded Derivative Gain Loss On Embedded Derivative Net

EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet

21500000

USD

CY2016Q4

us-gaap

Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch

FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch

350000000

USD

CY2017Q3

us-gaap

Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch

FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch

350000000

USD

CY2016Q4

us-gaap

Federal Home Loan Bank Stock

FederalHomeLoanBankStock

31600000

USD

CY2017Q3

us-gaap

Federal Home Loan Bank Stock

FederalHomeLoanBankStock

34200000

USD

CY2016Q3

us-gaap

Foreign Currency Transaction Gain Loss Before Tax

ForeignCurrencyTransactionGainLossBeforeTax

-200000

USD

us-gaap

Foreign Currency Transaction Gain Loss Before Tax

ForeignCurrencyTransactionGainLossBeforeTax

-100000

USD

CY2017Q3

us-gaap

Foreign Currency Transaction Gain Loss Before Tax

ForeignCurrencyTransactionGainLossBeforeTax

-100000

USD

us-gaap

Foreign Currency Transaction Gain Loss Before Tax

ForeignCurrencyTransactionGainLossBeforeTax

300000

USD

CY2016Q3

us-gaap

Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net

GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet

0

USD

us-gaap

Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net

GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet

0

USD

CY2017Q3

us-gaap

Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net

GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet

0

USD

us-gaap

Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net

GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet

0

USD

CY2016Q3

us-gaap

Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net

GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet

0

USD

us-gaap

Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net

GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet

0

USD

CY2017Q3

us-gaap

Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net

GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet

0

USD

us-gaap

Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net

GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet

0

USD

CY2016Q3

us-gaap

Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net

GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet

0

USD

us-gaap

Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net

GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet

0

USD

CY2017Q3

us-gaap

Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net

GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet

0

USD

us-gaap

Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net

GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet

0

USD

CY2016Q3

us-gaap

Gain Loss On Investments

GainLossOnInvestments

11000000

USD

us-gaap

Gain Loss On Investments

GainLossOnInvestments

-4200000

USD

CY2017Q3

us-gaap

Gain Loss On Investments

GainLossOnInvestments

9800000

USD

us-gaap

Gain Loss On Investments

GainLossOnInvestments

28900000

USD

CY2016Q3

us-gaap

Gain Loss On Investments Excluding Other Than Temporary Impairments

GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments

11000000

USD

us-gaap

Gain Loss On Investments Excluding Other Than Temporary Impairments

GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments

26300000

USD

CY2017Q3

us-gaap

Gain Loss On Investments Excluding Other Than Temporary Impairments

GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments

9800000

USD

us-gaap

Gain Loss On Investments Excluding Other Than Temporary Impairments

GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments

28900000

USD

CY2016Q3

us-gaap

Gain On Cash Flow Hedge Ineffectiveness

GainOnCashFlowHedgeIneffectiveness

0

USD

us-gaap

Gain On Cash Flow Hedge Ineffectiveness

GainOnCashFlowHedgeIneffectiveness

0

USD

CY2017Q3

us-gaap

Gain On Cash Flow Hedge Ineffectiveness

GainOnCashFlowHedgeIneffectiveness

0

USD

us-gaap

Gain On Cash Flow Hedge Ineffectiveness

GainOnCashFlowHedgeIneffectiveness

0

USD

CY2016Q3

us-gaap

Gain On Fair Value Hedge Ineffectiveness

GainOnFairValueHedgeIneffectiveness

0

USD

us-gaap

Gain On Fair Value Hedge Ineffectiveness

GainOnFairValueHedgeIneffectiveness

0

USD

CY2017Q3

us-gaap

Gain On Fair Value Hedge Ineffectiveness

GainOnFairValueHedgeIneffectiveness

0

USD

us-gaap

Gain On Fair Value Hedge Ineffectiveness

GainOnFairValueHedgeIneffectiveness

0

USD

CY2016Q4

us-gaap

Goodwill

335100000

USD

CY2017Q3

us-gaap

Goodwill

338200000

USD

CY2016Q3

us-gaap

Impaired Financing Receivable Average Recorded Investment

ImpairedFinancingReceivableAverageRecordedInvestment

3600000

USD

us-gaap

Impaired Financing Receivable Average Recorded Investment

ImpairedFinancingReceivableAverageRecordedInvestment

3000000

USD

CY2017Q3

us-gaap

Impaired Financing Receivable Average Recorded Investment

ImpairedFinancingReceivableAverageRecordedInvestment

0

USD

us-gaap

Impaired Financing Receivable Average Recorded Investment

ImpairedFinancingReceivableAverageRecordedInvestment

0

USD

CY2016Q3

us-gaap

Impaired Financing Receivable Interest Income Accrual Method

ImpairedFinancingReceivableInterestIncomeAccrualMethod

0

USD

us-gaap

Impaired Financing Receivable Interest Income Accrual Method

ImpairedFinancingReceivableInterestIncomeAccrualMethod

0

USD

CY2017Q3

us-gaap

Impaired Financing Receivable Interest Income Accrual Method

ImpairedFinancingReceivableInterestIncomeAccrualMethod

0

USD

us-gaap

Impaired Financing Receivable Interest Income Accrual Method

ImpairedFinancingReceivableInterestIncomeAccrualMethod

0

USD

CY2016Q3

us-gaap

Impaired Financing Receivable Recorded Investment

ImpairedFinancingReceivableRecordedInvestment

5400000

USD

CY2016Q3

us-gaap

Impairment Of Investments

ImpairmentOfInvestments

0

USD

us-gaap

Impairment Of Investments

ImpairmentOfInvestments

3100000

USD

CY2017Q3

us-gaap

Impairment Of Investments

ImpairmentOfInvestments

900000

USD

us-gaap

Impairment Of Investments

ImpairmentOfInvestments

900000

USD

CY2016Q3

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

332100000

USD

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

976500000

USD

CY2017Q3

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

366800000

USD

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

1058700000

USD

CY2016Q3

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

96100000

USD

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

293100000

USD

CY2017Q3

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

114500000

USD

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

331400000

USD

us-gaap

Increase Decrease In Accrued Income Taxes Payable

IncreaseDecreaseInAccruedIncomeTaxesPayable

-800000

USD

us-gaap

Increase Decrease In Accrued Income Taxes Payable

IncreaseDecreaseInAccruedIncomeTaxesPayable

81400000

USD

us-gaap

Increase Decrease In Accrued Investment Income Receivable

IncreaseDecreaseInAccruedInvestmentIncomeReceivable

135000000

USD

us-gaap

Increase Decrease In Accrued Investment Income Receivable

IncreaseDecreaseInAccruedInvestmentIncomeReceivable

145700000

USD

us-gaap

Increase Decrease In Cash Collateral For Loaned Securities

IncreaseDecreaseInCashCollateralForLoanedSecurities

24700000

USD

us-gaap

Increase Decrease In Cash Collateral For Loaned Securities

IncreaseDecreaseInCashCollateralForLoanedSecurities

-7700000

USD

CY2016Q3

us-gaap

Increase Decrease In Deferred Policy Acquisition Costs

IncreaseDecreaseInDeferredPolicyAcquisitionCosts

147800000

USD

us-gaap

Increase Decrease In Deferred Policy Acquisition Costs

IncreaseDecreaseInDeferredPolicyAcquisitionCosts

447000000

USD

CY2017Q3

us-gaap

Increase Decrease In Deferred Policy Acquisition Costs

IncreaseDecreaseInDeferredPolicyAcquisitionCosts

154800000

USD

us-gaap

Increase Decrease In Deferred Policy Acquisition Costs

IncreaseDecreaseInDeferredPolicyAcquisitionCosts

470100000

USD

us-gaap

Increase Decrease In Insurance Liabilities

IncreaseDecreaseInInsuranceLiabilities

274100000

USD

us-gaap

Increase Decrease In Insurance Liabilities

IncreaseDecreaseInInsuranceLiabilities

348100000

USD

us-gaap

Increase Decrease In Other Accrued Liabilities

IncreaseDecreaseInOtherAccruedLiabilities

-37600000

USD

us-gaap

Increase Decrease In Other Accrued Liabilities

IncreaseDecreaseInOtherAccruedLiabilities

-6600000

USD

us-gaap

Increase Decrease In Receivables

IncreaseDecreaseInReceivables

65700000

USD

us-gaap

Increase Decrease In Receivables

IncreaseDecreaseInReceivables

119000000

USD

CY2016Q3

us-gaap

Insurance Commissions

InsuranceCommissions

256800000

USD

us-gaap

Insurance Commissions

InsuranceCommissions

771700000

USD

CY2017Q3

us-gaap

Insurance Commissions

InsuranceCommissions

262400000

USD

us-gaap

Insurance Commissions

InsuranceCommissions

793900000

USD

CY2016Q3

us-gaap

Interest And Debt Expense

InterestAndDebtExpense

45200000

USD

us-gaap

Interest And Debt Expense

InterestAndDebtExpense

126200000

USD

CY2017Q3

us-gaap

Interest And Debt Expense

InterestAndDebtExpense

40100000

USD

us-gaap

Interest And Debt Expense

InterestAndDebtExpense

119800000

USD

CY2016Q3

us-gaap

Investment Income Interest And Dividend

InvestmentIncomeInterestAndDividend

622300000

USD

us-gaap

Investment Income Interest And Dividend

InvestmentIncomeInterestAndDividend

1875300000

USD

CY2017Q3

us-gaap

Investment Income Interest And Dividend

InvestmentIncomeInterestAndDividend

619600000

USD

us-gaap

Investment Income Interest And Dividend

InvestmentIncomeInterestAndDividend

1866500000

USD

CY2016Q3

us-gaap

Investment Income Investment Expense

InvestmentIncomeInvestmentExpense

7400000

USD

us-gaap

Investment Income Investment Expense

InvestmentIncomeInvestmentExpense

23500000

USD

CY2017Q3

us-gaap

Investment Income Investment Expense

InvestmentIncomeInvestmentExpense

7100000

USD

us-gaap

Investment Income Investment Expense

InvestmentIncomeInvestmentExpense

24000000

USD

CY2016Q3

us-gaap

Investment Tax Credit

InvestmentTaxCredit

10400000

USD

us-gaap

Investment Tax Credit

InvestmentTaxCredit

31300000

USD

CY2017Q3

us-gaap

Investment Tax Credit

InvestmentTaxCredit

10400000

USD

us-gaap

Investment Tax Credit

InvestmentTaxCredit

31300000

USD

CY2016Q4

us-gaap

Investments

51130900000

USD

CY2017Q3

us-gaap

Investments

52836400000

USD

CY2016Q3

us-gaap

Labor And Related Expense

LaborAndRelatedExpense

210100000

USD

us-gaap

Labor And Related Expense

LaborAndRelatedExpense

620600000

USD

CY2017Q3

us-gaap

Labor And Related Expense

LaborAndRelatedExpense

221800000

USD

us-gaap

Labor And Related Expense

LaborAndRelatedExpense

644700000

USD

CY2017Q3

us-gaap

Letters Of Credit Outstanding Amount

LettersOfCreditOutstandingAmount

2100000

USD

CY2016Q4

us-gaap

Liabilities

52973500000

USD

CY2017Q3

us-gaap

Liabilities

54357100000

USD

CY2016Q4

us-gaap

Liabilities And Stockholders Equity

LiabilitiesAndStockholdersEquity

61941500000

USD

CY2017Q3

us-gaap

Liabilities And Stockholders Equity

LiabilitiesAndStockholdersEquity

63805700000

USD

CY2015Q4

us-gaap

Liability For Claims And Claims Adjustment Expense

LiabilityForClaimsAndClaimsAdjustmentExpense

23796100000

USD

CY2016Q3

us-gaap

Liability For Claims And Claims Adjustment Expense

LiabilityForClaimsAndClaimsAdjustmentExpense

23368300000

USD

CY2016Q4

us-gaap

Liability For Claims And Claims Adjustment Expense

LiabilityForClaimsAndClaimsAdjustmentExpense

23249500000

USD

CY2017Q3

us-gaap

Liability For Claims And Claims Adjustment Expense

LiabilityForClaimsAndClaimsAdjustmentExpense

23196500000

USD

CY2016Q3

us-gaap

Liability For Claims And Claims Adjustment Expense Disability Accident And Health

LiabilityForClaimsAndClaimsAdjustmentExpenseDisabilityAccidentAndHealth

1483500000

USD

CY2016Q4

us-gaap

Liability For Claims And Claims Adjustment Expense Disability Accident And Health

LiabilityForClaimsAndClaimsAdjustmentExpenseDisabilityAccidentAndHealth

1507900000

USD

CY2017Q3

us-gaap

Liability For Claims And Claims Adjustment Expense Disability Accident And Health

LiabilityForClaimsAndClaimsAdjustmentExpenseDisabilityAccidentAndHealth

1539000000

USD

CY2016Q3

us-gaap

Liability For Future Policy Benefits

LiabilityForFuturePolicyBenefits

47228600000

USD

CY2017Q3

us-gaap

Liability For Future Policy Benefits

LiabilityForFuturePolicyBenefits

46995900000

USD

CY2016Q3

us-gaap

Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense

LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense

45745100000

USD

CY2016Q4

us-gaap

Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense

LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense

44245900000

USD

CY2017Q3

us-gaap

Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense

LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense

45456900000

USD

us-gaap

Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1

LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

1370300000

USD

us-gaap

Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1

LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

1463900000

USD

us-gaap

Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1

LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

3504400000

USD

us-gaap

Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1

LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

3478800000

USD

us-gaap

Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1

LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

4455900000

USD

us-gaap

Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1

LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

4889400000

USD

CY2015Q4

us-gaap

Liability For Unpaid Claims And Claims Adjustment Expense Net

LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet

21731500000

USD

CY2016Q3

us-gaap

Liability For Unpaid Claims And Claims Adjustment Expense Net

LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet

21312700000

USD

CY2016Q4

us-gaap

Liability For Unpaid Claims And Claims Adjustment Expense Net

LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet

21085900000

USD

CY2017Q3

us-gaap

Liability For Unpaid Claims And Claims Adjustment Expense Net

LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet

21032600000

USD

CY2017Q3

us-gaap

Line Of Credit

LineOfCredit

0

USD

CY2016Q4

us-gaap

Long Term Debt And Capital Lease Obligations

LongTermDebtAndCapitalLeaseObligations

2999400000

USD

CY2017Q3

us-gaap

Long Term Debt And Capital Lease Obligations

LongTermDebtAndCapitalLeaseObligations

2754100000

USD

CY2016Q4

us-gaap

Marketable Securities Equity Securities

MarketableSecuritiesEquitySecurities

1200000

USD

CY2017Q3

us-gaap

Marketable Securities Equity Securities

MarketableSecuritiesEquitySecurities

1300000

USD

CY2016Q3

us-gaap

Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount

MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount

0

USD

us-gaap

Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount

MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount

30500000

USD

CY2017Q3

us-gaap

Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount

MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount

0

USD

us-gaap

Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount

MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount

0

USD

CY2016Q4

us-gaap

Mortgage Loans On Real Estate Commercial And Consumer Net

MortgageLoansOnRealEstateCommercialAndConsumerNet

2038900000

USD

CY2017Q3

us-gaap

Mortgage Loans On Real Estate Commercial And Consumer Net

MortgageLoansOnRealEstateCommercialAndConsumerNet

2145300000

USD

us-gaap

Net Cash Provided By Used In Financing Activities

NetCashProvidedByUsedInFinancingActivities

-259300000

USD

us-gaap

Net Cash Provided By Used In Financing Activities

NetCashProvidedByUsedInFinancingActivities

-518400000

USD

us-gaap

Net Cash Provided By Used In Investing Activities

NetCashProvidedByUsedInInvestingActivities

-520600000

USD

us-gaap

Net Cash Provided By Used In Investing Activities

NetCashProvidedByUsedInInvestingActivities

-377900000

USD

us-gaap

Net Cash Provided By Used In Operating Activities

NetCashProvidedByUsedInOperatingActivities

754900000

USD

us-gaap

Net Cash Provided By Used In Operating Activities

NetCashProvidedByUsedInOperatingActivities

866000000

USD

CY2016Q3

us-gaap

Net Income Loss

NetIncomeLoss

236000000

USD

us-gaap

Net Income Loss

NetIncomeLoss

683400000

USD

CY2017Q3

us-gaap

Net Income Loss

NetIncomeLoss

252300000

USD

us-gaap

Net Income Loss

NetIncomeLoss

727300000

USD

CY2016Q3

us-gaap

Net Investment Income

NetInvestmentIncome

611400000

USD

us-gaap

Net Investment Income

NetInvestmentIncome

1841100000

USD

CY2017Q3

us-gaap

Net Investment Income

NetInvestmentIncome

609000000

USD

us-gaap

Net Investment Income

NetInvestmentIncome

1831900000

USD

us-gaap

Number Of Operating Segments

NumberOfOperatingSegments

3

Integer

CY2016Q4

us-gaap

Other Assets

OtherAssets

617300000

USD

CY2017Q3

us-gaap

Other Assets

OtherAssets

631900000

USD

CY2016Q3

us-gaap

Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax

OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

277200000

USD

us-gaap

Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax

OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

1999200000

USD

CY2017Q3

us-gaap

Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax

OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

66100000

USD

us-gaap

Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax

OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

616300000

USD

CY2016Q3

us-gaap

Other Comprehensive Income Loss Available For Sale Securities Tax

OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax

113900000

USD

us-gaap

Other Comprehensive Income Loss Available For Sale Securities Tax

OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax

1008100000

USD

CY2017Q3

us-gaap

Other Comprehensive Income Loss Available For Sale Securities Tax

OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax

39200000

USD

us-gaap

Other Comprehensive Income Loss Available For Sale Securities Tax

OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax

334700000

USD

CY2016Q3

us-gaap

Other Comprehensive Income Loss Before Reclassifications Net Of Tax

OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

117700000

USD

us-gaap

Other Comprehensive Income Loss Before Reclassifications Net Of Tax

OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

443700000

USD

CY2017Q3

us-gaap

Other Comprehensive Income Loss Before Reclassifications Net Of Tax

OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

27300000

USD

us-gaap

Other Comprehensive Income Loss Before Reclassifications Net Of Tax

OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

197400000

USD

CY2016Q3

us-gaap

Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax

OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

-8400000

USD

us-gaap

Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax

OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

-42800000

USD

CY2017Q3

us-gaap

Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax

OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

-13800000

USD

us-gaap

Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax

OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

-36800000

USD

CY2016Q3

us-gaap

Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax

OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax

-4300000

USD

us-gaap

Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax

OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax

-22300000

USD

CY2017Q3

us-gaap

Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax

OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax

-7400000

USD

us-gaap

Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax

OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax

-19700000

USD

CY2016Q3

us-gaap

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

-25800000

USD

us-gaap

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

-131600000

USD

CY2017Q3

us-gaap

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

31800000

USD

us-gaap

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

88700000

USD

CY2016Q3

us-gaap

Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax

OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

0

USD

us-gaap

Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax

OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

0

USD

CY2017Q3

us-gaap

Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax

OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

0

USD

us-gaap

Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax

OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

0

USD

CY2016Q3

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

110900000

USD

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

434600000

USD

CY2017Q3

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

19400000

USD

us-gaap

Other Comprehensive Income Loss Net Of Tax

OtherComprehensiveIncomeLossNetOfTax

175300000

USD

CY2016Q3

us-gaap

Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax

OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

-3000000

USD

us-gaap

Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax

OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

-10100000

USD

CY2017Q3

us-gaap

Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax

OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

-2200000

USD

us-gaap

Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax

OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

-6600000

USD

CY2016Q3

us-gaap

Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax

OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

-1700000

USD

us-gaap

Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax

OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

-5300000

USD

CY2017Q3

us-gaap

Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax

OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

-1500000

USD

us-gaap

Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax

OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

-4300000

USD

CY2016Q3

us-gaap

Other Cost And Expense Operating

OtherCostAndExpenseOperating

205500000

USD

us-gaap

Other Cost And Expense Operating

OtherCostAndExpenseOperating

618900000

USD

CY2017Q3

us-gaap

Other Cost And Expense Operating

OtherCostAndExpenseOperating

193500000

USD

us-gaap

Other Cost And Expense Operating

OtherCostAndExpenseOperating

630500000

USD

CY2016Q3

us-gaap

Other Income

OtherIncome

51500000

USD

us-gaap

Other Income

OtherIncome

154600000

USD

CY2017Q3

us-gaap

Other Income

OtherIncome

46700000

USD

us-gaap

Other Income

OtherIncome

148100000

USD

CY2016Q4

us-gaap

Other Liabilities

OtherLiabilities

1675900000

USD

CY2017Q3

us-gaap

Other Liabilities

OtherLiabilities

1699400000

USD

CY2016Q4

us-gaap

Other Long Term Investments

OtherLongTermInvestments

631500000

USD

CY2017Q3

us-gaap

Other Long Term Investments

OtherLongTermInvestments

654500000

USD

us-gaap

Other Noncash Income Expense

OtherNoncashIncomeExpense

-26200000

USD

us-gaap

Other Noncash Income Expense

OtherNoncashIncomeExpense

2400000

USD

CY2016Q4

us-gaap

Other Policyholder Funds

OtherPolicyholderFunds

1623800000

USD

CY2017Q3

us-gaap

Other Policyholder Funds

OtherPolicyholderFunds

1606900000

USD

CY2016Q4

us-gaap

Other Short Term Investments

OtherShortTermInvestments

780000000

USD

CY2017Q3

us-gaap

Other Short Term Investments

OtherShortTermInvestments

1046500000

USD

CY2016Q3

us-gaap

Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net

OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet

0

USD

us-gaap

Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net

OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet

30500000

USD

CY2017Q3

us-gaap

Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net

OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet

0

USD

us-gaap

Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net

OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet

0

USD

us-gaap

Payments For Losses And Loss Adjustment Expense

PaymentsForLossesAndLossAdjustmentExpense

4874700000

USD

us-gaap

Payments For Losses And Loss Adjustment Expense

PaymentsForLossesAndLossAdjustmentExpense

4942700000

USD

us-gaap

Payments For Proceeds From Short Term Investments

PaymentsForProceedsFromShortTermInvestments

-38600000

USD

us-gaap

Payments For Proceeds From Short Term Investments

PaymentsForProceedsFromShortTermInvestments

252600000

USD

us-gaap

Payments For Repurchase Of Common Stock

PaymentsForRepurchaseOfCommonStock

309100000

USD

us-gaap

Payments For Repurchase Of Common Stock

PaymentsForRepurchaseOfCommonStock

307200000

USD

us-gaap

Payments Of Dividends

PaymentsOfDividends

136200000

USD

us-gaap

Payments Of Dividends

PaymentsOfDividends

144100000

USD

us-gaap

Payments To Acquire Available For Sale Securities

PaymentsToAcquireAvailableForSaleSecurities

2452300000

USD

us-gaap

Payments To Acquire Available For Sale Securities

PaymentsToAcquireAvailableForSaleSecurities

2063400000

USD

us-gaap

Payments To Acquire Businesses Net Of Cash Acquired

PaymentsToAcquireBusinessesNetOfCashAcquired

128500000

USD

us-gaap

Payments To Acquire Businesses Net Of Cash Acquired

PaymentsToAcquireBusinessesNetOfCashAcquired

0

USD

us-gaap

Payments To Acquire Other Investments

PaymentsToAcquireOtherInvestments

431400000

USD

us-gaap

Payments To Acquire Other Investments

PaymentsToAcquireOtherInvestments

313500000

USD

us-gaap

Payments To Acquire Property Plant And Equipment

PaymentsToAcquirePropertyPlantAndEquipment

60100000

USD

us-gaap

Payments To Acquire Property Plant And Equipment

PaymentsToAcquirePropertyPlantAndEquipment

64700000

USD

CY2016Q3

us-gaap

Policyholder Benefits And Claims Incurred Net

PolicyholderBenefitsAndClaimsIncurredNet

1742600000

USD

us-gaap

Policyholder Benefits And Claims Incurred Net

PolicyholderBenefitsAndClaimsIncurredNet

5205900000

USD

CY2017Q3

us-gaap

Policyholder Benefits And Claims Incurred Net

PolicyholderBenefitsAndClaimsIncurredNet

1765600000

USD

us-gaap

Policyholder Benefits And Claims Incurred Net

PolicyholderBenefitsAndClaimsIncurredNet

5266600000

USD

CY2017Q3

us-gaap

Preferred Stock Par Or Stated Value Per Share

PreferredStockParOrStatedValuePerShare

0.10

CY2017Q3

us-gaap

Preferred Stock Shares Authorized

PreferredStockSharesAuthorized

25000000

shares

CY2017Q3

us-gaap

Preferred Stock Shares Issued

PreferredStockSharesIssued

0

shares

CY2016Q4

us-gaap

Premiums And Other Receivables Net

PremiumsAndOtherReceivablesNet

1610800000

USD

CY2017Q3

us-gaap

Premiums And Other Receivables Net

PremiumsAndOtherReceivablesNet

1697700000

USD

CY2016Q3

us-gaap

Premiums Earned Net

PremiumsEarnedNet

2089400000

USD

us-gaap

Premiums Earned Net

PremiumsEarnedNet

6258500000

USD

CY2017Q3

us-gaap

Premiums Earned Net

PremiumsEarnedNet

2153600000

USD

us-gaap

Premiums Earned Net

PremiumsEarnedNet

6438700000

USD

us-gaap

Proceeds From Issuance Of Common Stock

ProceedsFromIssuanceOfCommonStock

3600000

USD

us-gaap

Proceeds From Issuance Of Long Term Debt

ProceedsFromIssuanceOfLongTermDebt

609100000

USD

us-gaap

Proceeds From Issuance Of Long Term Debt

ProceedsFromIssuanceOfLongTermDebt

0

USD

us-gaap

Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities

ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

1504100000

USD

us-gaap

Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities

ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

1848500000

USD

us-gaap

Proceeds From Payments For Other Financing Activities

ProceedsFromPaymentsForOtherFinancingActivities

-27700000

USD

us-gaap

Proceeds From Payments For Other Financing Activities

ProceedsFromPaymentsForOtherFinancingActivities

-28100000

USD

us-gaap

Proceeds From Sale And Maturity Of Other Investments

ProceedsFromSaleAndMaturityOfOtherInvestments

257700000

USD

us-gaap

Proceeds From Sale And Maturity Of Other Investments

ProceedsFromSaleAndMaturityOfOtherInvestments

172300000

USD

us-gaap

Proceeds From Sale Of Available For Sale Securities

ProceedsFromSaleOfAvailableForSaleSecurities

726600000

USD

us-gaap

Proceeds From Sale Of Available For Sale Securities

ProceedsFromSaleOfAvailableForSaleSecurities

303200000

USD

CY2016Q4

us-gaap

Property Plant And Equipment Net

PropertyPlantAndEquipmentNet

500600000

USD

CY2017Q3

us-gaap

Property Plant And Equipment Net

PropertyPlantAndEquipmentNet

489900000

USD

CY2016Q3

us-gaap

Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax

ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

6800000

USD

us-gaap

Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax

ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

9100000

USD

CY2017Q3

us-gaap

Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax

ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

7900000

USD

us-gaap

Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax

ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

22100000

USD

CY2015Q4

us-gaap

Reinsurance Receivables Incurred But Not Reported Claims

ReinsuranceReceivablesIncurredButNotReportedClaims

2064600000

USD

CY2016Q3

us-gaap

Reinsurance Receivables Incurred But Not Reported Claims

ReinsuranceReceivablesIncurredButNotReportedClaims

2055600000

USD

CY2016Q4

us-gaap

Reinsurance Receivables Incurred But Not Reported Claims

ReinsuranceReceivablesIncurredButNotReportedClaims

2163600000

USD

CY2017Q3

us-gaap

Reinsurance Receivables Incurred But Not Reported Claims

ReinsuranceReceivablesIncurredButNotReportedClaims

2163900000

USD

CY2016Q4

us-gaap

Reinsurance Recoverables

ReinsuranceRecoverables

4858900000

USD

CY2017Q3

us-gaap

Reinsurance Recoverables

ReinsuranceRecoverables

4893700000

USD

us-gaap

Repayments Of Long Term Debt

RepaymentsOfLongTermDebt

399000000

USD

us-gaap

Repayments Of Long Term Debt

RepaymentsOfLongTermDebt

48500000

USD

us-gaap

Repurchase Agreements Maturities

RepurchaseAgreementsMaturities

30 days

CY2016Q4

us-gaap

Retained Earnings Accumulated Deficit

RetainedEarningsAccumulatedDeficit

8744000000

USD

CY2017Q3

us-gaap

Retained Earnings Accumulated Deficit

RetainedEarningsAccumulatedDeficit

9327200000

USD

CY2016Q3

us-gaap

Revenues

2763300000

USD

us-gaap

Revenues

8250000000

USD

CY2017Q3

us-gaap

Revenues

2819100000

USD

us-gaap

Revenues

8447600000

USD

CY2016Q4

us-gaap

Securities Borrowed

SecuritiesBorrowed

178500000

USD

CY2017Q3

us-gaap

Securities Borrowed

SecuritiesBorrowed

169900000

USD

CY2016Q4

us-gaap

Securities Borrowed Amount Offset Against Collateral

SecuritiesBorrowedAmountOffsetAgainstCollateral

0

USD

CY2017Q3

us-gaap

Securities Borrowed Amount Offset Against Collateral

SecuritiesBorrowedAmountOffsetAgainstCollateral

0

USD

CY2016Q4

us-gaap

Securities Borrowed Collateral Obligation To Return Cash

SecuritiesBorrowedCollateralObligationToReturnCash

29900000

USD

CY2017Q3

us-gaap

Securities Borrowed Collateral Obligation To Return Cash

SecuritiesBorrowedCollateralObligationToReturnCash

32300000

USD

CY2016Q4

us-gaap

Securities Borrowed Collateral Obligation To Return Securities

SecuritiesBorrowedCollateralObligationToReturnSecurities

148600000

USD

CY2017Q3

us-gaap

Securities Borrowed Collateral Obligation To Return Securities

SecuritiesBorrowedCollateralObligationToReturnSecurities

137600000

USD

CY2016Q4

us-gaap

Securities Borrowed Gross

SecuritiesBorrowedGross

178500000

USD

CY2017Q3

us-gaap

Securities Borrowed Gross

SecuritiesBorrowedGross

169900000

USD

CY2016Q4

us-gaap

Securities Borrowed Liability

SecuritiesBorrowedLiability

0

USD

CY2017Q3

us-gaap

Securities Borrowed Liability

SecuritiesBorrowedLiability

0

USD

CY2016Q4

us-gaap

Securities Loaned

SecuritiesLoaned

29900000

USD

CY2017Q3

us-gaap

Securities Loaned

SecuritiesLoaned

32300000

USD

CY2016Q4

us-gaap

Securities Loaned Amount Offset Against Collateral

SecuritiesLoanedAmountOffsetAgainstCollateral

0

USD

CY2017Q3

us-gaap

Securities Loaned Amount Offset Against Collateral

SecuritiesLoanedAmountOffsetAgainstCollateral

0

USD

CY2016Q4

us-gaap

Securities Loaned Asset

SecuritiesLoanedAsset

0

USD

CY2017Q3

us-gaap

Securities Loaned Asset

SecuritiesLoanedAsset

0

USD

CY2016Q4

us-gaap

Securities Loaned Collateral Right To Reclaim Cash

SecuritiesLoanedCollateralRightToReclaimCash

0

USD

CY2017Q3

us-gaap

Securities Loaned Collateral Right To Reclaim Cash

SecuritiesLoanedCollateralRightToReclaimCash

0

USD

CY2016Q4

us-gaap

Securities Loaned Collateral Right To Reclaim Securities

SecuritiesLoanedCollateralRightToReclaimSecurities

29900000

USD

CY2017Q3

us-gaap

Securities Loaned Collateral Right To Reclaim Securities

SecuritiesLoanedCollateralRightToReclaimSecurities

32300000

USD

CY2016Q4

us-gaap

Securities Loaned Gross

SecuritiesLoanedGross

29900000

USD

CY2017Q3

us-gaap

Securities Loaned Gross

SecuritiesLoanedGross

32300000

USD

CY2016Q4

us-gaap

Securities Sold Under Agreements To Repurchase

SecuritiesSoldUnderAgreementsToRepurchase

0

USD

CY2017Q3

us-gaap

Securities Sold Under Agreements To Repurchase

SecuritiesSoldUnderAgreementsToRepurchase

0

USD

us-gaap

Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit

ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit

20.78

us-gaap

Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit

ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit

26.29

CY2016Q3

us-gaap

Stockholders Equity

StockholdersEquity

9361200000

USD

CY2016Q4

us-gaap

Stockholders Equity

StockholdersEquity

8968000000

USD

CY2017Q3

us-gaap

Stockholders Equity

StockholdersEquity

9448600000

USD

CY2015Q4

us-gaap

Stockholders Equity Including Portion Attributable To Noncontrolling Interest