$ALE
ALLETE INC Stock $ale

$ale Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000006675612000026 Filed on February 15, 2012

Income Statement

Concept	2011 Q4	2011	2010 Q4
Revenue	$239.2M	$928.2M	$238.1M
YoY Change	0.46%	2.34%	10.23%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$23.30M	$90.40M	$20.70M
YoY Change	12.56%	12.3%	15.64%
% of Gross Profit
Operating Expenses	$205.0M	$778.2M	$215.4M
YoY Change	-4.83%	0.91%	18.22%
Operating Profit	$34.20M	$150.0M	$22.70M
YoY Change	50.66%	10.46%
Interest Expense	-$5.000M	$43.60M	-$6.500M
YoY Change	-23.08%	11.22%	116.67%
% of Operating Profit	-14.62%	29.07%	-28.63%
Other Income/Expense, Net	$800.0K	-$20.80M	$700.0K
YoY Change	14.29%	24.55%	-125.0%
Pretax Income	$30.00M	$129.2M	$16.90M
YoY Change	77.51%	8.48%	-39.64%
Income Tax	$10.90M	$35.60M	$3.800M
% Of Pretax Income	36.33%	27.55%	22.49%
Net Earnings	$19.10M	$93.80M	$13.30M
YoY Change	43.61%	24.57%	-28.88%
Net Earnings / Revenue	7.98%	10.11%	5.59%
Basic Earnings Per Share	$0.53	$2.66	$0.38
Diluted Earnings Per Share	$0.53	$2.65	$0.38
COMMON SHARES
Basic Shares Outstanding		35.30M shares
Diluted Shares Outstanding		35.40M shares

Balance Sheet

Concept	2011 Q4	2011	2010 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$101.1M	$101.1M	$51.60M
YoY Change	95.93%	95.93%	100.78%
Cash & Equivalents	$101.1M	$101.1M	$44.90M
Short-Term Investments	$0.00	$0.00	$6.700M
Other Short-Term Assets	$9.600M	$27.10M	$8.000M
YoY Change	20.0%	-5.24%	-67.08%
Inventory	$69.10M	$69.10M	$60.00M
Prepaid Expenses	$27.10M		$28.60M
Receivables	$79.70M	$79.70M	$99.50M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$277.0M	$277.0M	$239.7M
YoY Change	15.56%	15.56%	6.3%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.983B	$1.983B	$1.806B
YoY Change	9.81%	9.81%	11.27%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$98.90M	$231.2M	$93.30M
YoY Change	6.0%	5.43%	5.54%
Other Assets	$39.20M	$385.1M	$34.30M
YoY Change	14.29%	11.79%	-89.48%
Total Long-Term Assets	$2.599B	$2.599B	$2.369B
YoY Change	9.69%	9.69%	9.31%
TOTAL ASSETS
Total Short-Term Assets	$277.0M	$277.0M	$239.7M
Total Long-Term Assets	$2.599B	$2.599B	$2.369B
Total Assets	$2.876B	$2.876B	$2.609B
YoY Change	10.23%	10.23%	9.03%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$71.80M	$71.80M	$75.40M
YoY Change	-4.77%	-4.77%	21.42%
Accrued Expenses	$12.80M	$12.80M	$13.40M
YoY Change	-4.48%	-4.48%	20.72%
Deferred Revenue
YoY Change
Short-Term Debt	$6.500M	$1.100M	$14.40M
YoY Change	-54.86%	10.0%	657.89%
Long-Term Debt Due	$5.400M	$5.400M	$13.40M
YoY Change	-59.7%	-59.7%	157.69%
Total Short-Term Liabilities	$163.1M	$163.1M	$158.9M
YoY Change	2.64%	2.64%	19.38%
LONG-TERM LIABILITIES
Long-Term Debt	$857.9M	$857.9M	$771.6M
YoY Change	11.18%	11.18%	10.89%
Other Long-Term Liabilities	$105.1M	$402.1M	$93.40M
YoY Change	12.53%	9.15%	-74.9%
Total Long-Term Liabilities	$963.0M	$1.260B	$865.0M
YoY Change	11.33%	10.53%	-19.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$163.1M	$163.1M	$158.9M
Total Long-Term Liabilities	$963.0M	$1.260B	$865.0M
Total Liabilities	$1.797B	$1.797B	$1.624B
YoY Change	10.63%	10.02%	10.97%
SHAREHOLDERS EQUITY
Retained Earnings	$431.6M		$399.9M
YoY Change	7.93%
Common Stock	$705.6M		$636.1M
YoY Change	10.93%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.079B	$1.079B	$976.0M
YoY Change
Total Liabilities & Shareholders Equity	$2.876B	$2.876B	$2.609B
YoY Change	10.23%	10.23%	9.03%

Cashflow Statement

Concept	2011 Q4	2011	2010 Q4
OPERATING ACTIVITIES
Net Income	$19.10M	$93.80M	$13.30M
YoY Change	43.61%	24.57%	-28.88%
Depreciation, Depletion And Amortization	$23.30M	$90.40M	$20.70M
YoY Change	12.56%	12.3%	15.64%
Cash From Operating Activities	$56.60M	$241.7M	$40.70M
YoY Change	39.07%	5.68%	30.87%
INVESTING ACTIVITIES
Capital Expenditures	-$82.40M	$239.2M	-$76.20M
YoY Change	8.14%	-3.9%	-35.64%
Acquisitions
YoY Change
Other Investing Activities	-$3.600M	$7.400M	$3.000M
YoY Change	-220.0%	-669.23%	-38.78%
Cash From Investing Activities	-$86.00M	-$240.9M	-$73.20M
YoY Change	17.49%	-3.99%	-35.51%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$39.10M
YoY Change		90.73%
Debt Paid & Issued, Net		$3.100M
YoY Change		-95.63%
Cash From Financing Activities	-4.600M	$55.40M	-14.90M
YoY Change	-69.13%	33.82%	-127.7%
NET CHANGE
Cash From Operating Activities	56.60M	$241.7M	40.70M
Cash From Investing Activities	-86.00M	-$240.9M	-73.20M
Cash From Financing Activities	-4.600M	$55.40M	-14.90M
Net Change In Cash	-34.00M	$56.20M	-47.40M
YoY Change	-28.27%	192.71%	65.73%
FREE CASH FLOW
Cash From Operating Activities	$56.60M	$241.7M	$40.70M
Capital Expenditures	-$82.40M	$239.2M	-$76.20M
Free Cash Flow	$139.0M	$2.500M	$116.9M
YoY Change	18.91%	-112.38%	-21.81%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2010Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	75400000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	71800000	USD
CY2010Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	99500000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	79700000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1300000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	0	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-300000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	22200000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	27300000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-23200000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-28900000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	900000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	900000	USD
CY2010Q4	us-gaap	Allowance For Notes And Loans Receivable Noncurrent AllowanceForNotesAndLoansReceivableNoncurrent	800000	USD
CY2011Q4	us-gaap	Allowance For Notes And Loans Receivable Noncurrent AllowanceForNotesAndLoansReceivableNoncurrent	600000	USD
CY2009	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	600000	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	300000	shares
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	500000	shares
CY2009	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3100000	USD
CY2010	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2011	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1700000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	50300000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	57000000	USD
CY2009Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	44600000	USD
CY2010	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	2900000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	6400000	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2800000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	300000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	800000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-5700000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	9000000	USD
CY2010Q4	us-gaap	Assets Assets	2609100000	USD
CY2011Q4	us-gaap	Assets Assets	2876000000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	277000000	USD
CY2010Q4	us-gaap	Assets Current AssetsCurrent	239700000	USD
CY2010Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	27400000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	27300000	USD
CY2009Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	33100000	USD
CY2010Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	25200000	USD
CY2009Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	29500000	USD
CY2011Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	24700000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2009	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2009	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	6700000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	-1700000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	5500000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2009	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2010Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	-2400000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	-2700000	USD
CY2009Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	-3700000	USD
CY2011Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	24700000	USD
CY2010Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	25200000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	100000	USD
CY2010Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	200000	USD
CY2009Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	100000	USD
CY2011Q4	us-gaap	Bankruptcy Claims Amount Of Claims Under Review By Management BankruptcyClaimsAmountOfClaimsUnderReviewByManagement	3200000	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	5900000	USD
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CY2010	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	7500000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	101100000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	44900000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	25700000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	102000000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	56200000	USD
CY2009	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-76300000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	19200000	USD
CY2010Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.78
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.76
CY2009	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.76
CY2010Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0
CY2010Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	80000000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	80000000	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	37500000	shares
CY2010Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	35800000	shares
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	636100000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	705600000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	76100000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	70000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	88100000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-200000	USD
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CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-500000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	69700000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	87900000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	75600000	USD
CY2010	us-gaap	Contribution Of Property ContributionOfProperty	0	USD
CY2009	us-gaap	Contribution Of Property ContributionOfProperty	-12000000	USD
CY2011	us-gaap	Contribution Of Property ContributionOfProperty	-20000000	USD
CY2010	us-gaap	Cost Of Domestic Regulated Electric CostOfDomesticRegulatedElectric	325100000	USD
CY2009	us-gaap	Cost Of Domestic Regulated Electric CostOfDomesticRegulatedElectric	279500000	USD
CY2011	us-gaap	Cost Of Domestic Regulated Electric CostOfDomesticRegulatedElectric	306600000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1400000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-23000000	USD
CY2009	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-42600000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-21700000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-44400000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-200000	USD
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CY2011Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	16300000	USD
CY2011	us-gaap	Customer Refundable Fees Refund Payments CustomerRefundableFeesRefundPayments	0	USD
CY2010	us-gaap	Customer Refundable Fees Refund Payments CustomerRefundableFeesRefundPayments	0	USD
CY2009	us-gaap	Customer Refundable Fees Refund Payments CustomerRefundableFeesRefundPayments	-7600000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	5300000	USD
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CY2011	us-gaap	Debt Related Commitment Fees And Debt Issuance Costs DebtRelatedCommitmentFeesAndDebtIssuanceCosts	900000	USD
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CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	61400000	USD
CY2010Q4	us-gaap	Deferred Fuel Cost DeferredFuelCost	20600000	USD
CY2011Q4	us-gaap	Deferred Fuel Cost DeferredFuelCost	17500000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	35800000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	75200000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	66000000	USD
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CY2010Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	325200000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	373600000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	24000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	27300000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	482700000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	387200000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	105800000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	117900000	USD
CY2010	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0581
CY2009	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0612
CY2012	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0825
CY2010	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	0.10
CY2011	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	0.10
CY2011Q4	us-gaap	Defined Benefit Plan Number Of Shares Of Equity Securities Issued By Employer And Related Parties Included In Plan Assets DefinedBenefitPlanNumberOfSharesOfEquitySecuritiesIssuedByEmployerAndRelatedPartiesIncludedInPlanAssets	20000000	shares
CY2010Q4	us-gaap	Defined Benefit Plan Number Of Shares Of Equity Securities Issued By Employer And Related Parties Included In Plan Assets DefinedBenefitPlanNumberOfSharesOfEquitySecuritiesIssuedByEmployerAndRelatedPartiesIncludedInPlanAssets	0	shares
CY2011	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.05
CY2010	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.05
CY2010Q4	us-gaap	Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearThatRateReachesUltimateTrendRate	2018
CY2011Q4	us-gaap	Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearThatRateReachesUltimateTrendRate	2018
CY2011	us-gaap	Depreciation Depreciation	90400000	USD
CY2010	us-gaap	Depreciation Depreciation	80500000	USD
CY2009	us-gaap	Depreciation Depreciation	64700000	USD
CY2011Q4	us-gaap	Derivative Fixed Interest Rate DerivativeFixedInterestRate	0.00825
CY2011	us-gaap	Discussion Of Interest Rate Cash Flow Hedge Effectiveness Assessment And Measurement DiscussionOfInterestRateCashFlowHedgeEffectivenessAssessmentAndMeasurement	The shortcut method is used to assess hedge effectiveness. At inception, all shortcut method requirements were satisfied; thus changes in value of the Swap designated as the hedging instrument will be deemed 100 percent effective. As a result, there was no ineffectiveness recorded for the year ended December 31, 2011.
CY2010	us-gaap	Dividends Common Stock DividendsCommonStock	-60800000	USD
CY2011	us-gaap	Dividends Common Stock DividendsCommonStock	-62100000	USD
CY2009	us-gaap	Dividends Common Stock DividendsCommonStock	-56500000	USD
CY2009	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.89
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.20
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.66
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2010Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.68
CY2010Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2010Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.49
CY2010Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.07
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.19
CY2009	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.89
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.65
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.53
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2010Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2010Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.07
CY2010Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.68
CY2010Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.38
CY2009	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.337
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.372
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.276
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2009	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2011	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	900000	USD
CY2009	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	800000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	700000	USD
CY2009	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	6500000	USD
CY2011	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	7400000	USD
CY2010	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	7100000	USD
CY2011	us-gaap	Employee Stock Ownership Plan Esop Debt Structure Employer Loan Description EmployeeStockOwnershipPlanESOPDebtStructureEmployerLoanDescription	In 1990, the ESOP issued a $75.0 million note (term not to exceed 25 years at 10.25 percent) to use as consideration for 2.8 million shares (1.9 million shares adjusted for stock splits) of our newly issued common stock. The note was refinanced in 2006 at 6 percent.
CY2011Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	42000000	USD
CY2010Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	48400000	USD
CY2009Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	49000000	USD
CY2011Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	2200000	shares
CY2009Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	2200000	shares
CY2010Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	2200000	shares
CY2010Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	1300000	shares
CY2009Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	1500000	shares
CY2011Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	1000000	shares
CY2009Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	3700000	shares
CY2010Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	3500000	shares
CY2011Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	3200000	shares
CY2010Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	22900000	USD
CY2011Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	28600000	USD
CY2010Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity EquityMethodInvestmentSummarizedFinancialInformationEquity	1260000000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	3112400000	USD
CY2010Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	2948300000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	219700000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	223900000	USD
CY2009	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	213400000	USD
CY2010Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	2888400000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	3053700000	USD
CY2009	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	521500000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	556700000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	567200000	USD
CY2010Q4	us-gaap	Equity Method Investments EquityMethodInvestments	93300000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	98900000	USD
CY2009Q4	us-gaap	Equity Method Investments EquityMethodInvestments	88400000	USD
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	-14800000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	-14600000	USD
CY2011Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.08
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	3112400000	USD
CY2010Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	2948300000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	58700000	USD
CY2010Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	59900000	USD
CY2010Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	428400000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	298500000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity EquityMethodInvestmentSummarizedFinancialInformationEquity	1331300000	USD
CY2010	us-gaap	Financing Receivable Allowance For Credit Losses Provisions FinancingReceivableAllowanceForCreditLossesProvisions	800000	USD
CY2011	us-gaap	Financing Receivable Allowance For Credit Losses Provisions FinancingReceivableAllowanceForCreditLossesProvisions	600000	USD
CY2010	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	0	USD
CY2009	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-200000	USD
CY2011	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-900000	USD
CY2011	us-gaap	Impairment Of Investments ImpairmentOfInvestments	-1700000	USD
CY2010	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	119100000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	91500000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	129200000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	18400000	USD
CY2010Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	13900000	USD
CY2011Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	1300000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	41700000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	45200000	USD
CY2009	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	17500000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	17900000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-3100000	USD
CY2009	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	100000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-3200000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35600000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30800000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44300000	USD
CY2009	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	32000000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1000000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2900000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2300000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6000000	USD
CY2009	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5400000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4500000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	1200000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	4300000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	1600000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-11400000	USD
CY2009	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-5600000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-54200000	USD
CY2011	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	18600000	USD
CY2009	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-43500000	USD
CY2010	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	17900000	USD
CY2009	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	10500000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-9500000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	5800000	USD
CY2010	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	4200000	USD
CY2011	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	2500000	USD
CY2010Q4	us-gaap	Interest Payable Current InterestPayableCurrent	13400000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	12800000	USD
CY2009	us-gaap	Interest Expense InterestExpense	33800000	USD
CY2010	us-gaap	Interest Expense InterestExpense	39200000	USD
CY2011	us-gaap	Interest Expense InterestExpense	43600000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	43200000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	35700000	USD
CY2009	us-gaap	Interest Paid Net InterestPaidNet	29800000	USD
CY2009	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	5800000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-3000000	USD
CY2009	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-7300000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-9100000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-7500000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-25600000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4200000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-400000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	7900000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	7900000	USD
CY2010	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-39300000	USD
CY2009	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-30200000	USD
CY2011	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-24700000	USD
CY2010	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-4300000	USD
CY2011	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1500000	USD
CY2009	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	0	USD
CY2011Q4	us-gaap	Interest Rate Cash Flow Hedge Liability At Fair Value InterestRateCashFlowHedgeLiabilityAtFairValue	-400000	USD
CY2010Q4	us-gaap	Inventory Net InventoryNet	60000000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	69100000	USD
CY2011Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	40500000	USD
CY2010Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	37100000	USD
CY2011Q4	us-gaap	Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService	418800000	USD
CY2011Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress	24700000	USD
CY2011Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation	177400000	USD
CY2010Q4	us-gaap	Land Available For Sale LandAvailableForSale	86000000	USD
CY2009Q4	us-gaap	Land Available For Sale LandAvailableForSale	74900000	USD
CY2011Q4	us-gaap	Land Available For Sale LandAvailableForSale	86000000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9400000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9400000	USD
CY2009	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9300000	USD
CY2010Q4	us-gaap	Liabilities Liabilities	1624100000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	1796700000	USD
CY2010Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	771600000	USD
CY2010Q4	us-gaap	Long Term Investments LongTermInvestments	126000000	USD
CY2011Q4	us-gaap	Long Term Investments LongTermInvestments	132300000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	19100000	USD
CY2010Q2	us-gaap	Net Income Loss NetIncomeLoss	19400000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	0	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2609100000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2876000000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	163100000	USD
CY2010Q4	us-gaap	Liabilities Current LiabilitiesCurrent	158900000	USD
CY2010Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3700000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	2000000	USD
CY2010Q4	us-gaap	Long Term Debt LongTermDebt	785000000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	863300000	USD
CY2010Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	13400000	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	5400000	USD
CY2010Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	796700000	USD
CY2011Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	966400000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	642300000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	21000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	16700000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	94100000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	83800000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	857900000	USD
CY2010Q4	us-gaap	Minority Interest MinorityInterest	9000000	USD
CY2011	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	8800000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	106300000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	55400000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	41400000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-320000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-250900000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-240900000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	137400000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	228700000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	241700000	USD
CY2009	us-gaap	Net Income Loss NetIncomeLoss	61000000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	75300000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	93800000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	17000000	USD
CY2010Q3	us-gaap	Net Income Loss NetIncomeLoss	19600000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	20500000	USD
CY2010Q4	us-gaap	Net Income Loss NetIncomeLoss	13300000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	37200000	USD
CY2010Q1	us-gaap	Net Income Loss NetIncomeLoss	23000000	USD
CY2009	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-300000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-500000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-200000	USD
CY2009	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	61000000	USD
CY2011	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	93800000	USD
CY2010	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	75300000	USD
CY2009	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-14500000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-20800000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-16700000	USD
CY2010Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	3700000	USD
CY2011Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	2000000	USD
CY2011Q4	us-gaap	Notes Payable Current NotesPayableCurrent	1100000	USD
CY2010Q4	us-gaap	Notes Payable Current NotesPayableCurrent	1000000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	135800000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	150000000	USD
CY2009	us-gaap	Operating Income Loss OperatingIncomeLoss	106000000	USD
CY2010Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	31700000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	50800000	USD
CY2010Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	22700000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	26100000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	34200000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	38900000	USD
CY2010Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	46100000	USD
CY2010Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	35300000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	10900000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	9200000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	11200000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	11400000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	11100000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	43000000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	29300000	USD
CY2010Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	30800000	USD
CY2010Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	43100000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	48100000	USD
CY2010Q4	us-gaap	Other Assets Current OtherAssetsCurrent	8000000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	9600000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	39200000	USD
CY2010Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	34300000	USD
CY2009	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	6200000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	-5100000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	0	USD
CY2009	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax OtherComprehensiveIncomeDefinedBenefitPlansTax	4100000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax OtherComprehensiveIncomeDefinedBenefitPlansTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax OtherComprehensiveIncomeDefinedBenefitPlansTax	-3600000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-300000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-200000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	4500000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	1400000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-400000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-300000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	2800000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	800000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-100000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	600000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1700000	USD
CY2010	us-gaap	Other Income OtherIncome	400000	USD
CY2009	us-gaap	Other Income OtherIncome	-4000000	USD
CY2011	us-gaap	Other Income OtherIncome	1900000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	45600000	USD
CY2010Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	33700000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	105100000	USD
CY2010Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	93400000	USD
CY2011Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	16300000	USD
CY2010Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	6800000	USD
CY2009	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1800000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4600000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4400000	USD
CY2011Q4	us-gaap	Other Real Estate OtherRealEstate	3300000	USD
CY2010Q4	us-gaap	Other Real Estate OtherRealEstate	4300000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	7400000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1300000	USD
CY2009	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	700000	USD
CY2009	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	600000	USD
CY2010	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1400000	USD
CY2011	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	60800000	USD
CY2009	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	56500000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	62100000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2300000	USD
CY2009	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2200000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2300000	USD
CY2011	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates	2000000	USD
CY2010	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates	1600000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	239200000	USD
CY2009	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	318500000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	248900000	USD
CY2011	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	23600000	USD
CY2009	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	11700000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	18000000	USD
CY2010Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	231400000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	253500000	USD
CY2011Q4	us-gaap	Percentage Of Debt Hedged By Interest Rate Derivatives PercentageOfDebtHedgedByInterestRateDerivatives	0.09
CY2010Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	28600000	USD
CY2011Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	27100000	USD
CY2011Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	27100000	USD
CY2010Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	28600000	USD
CY2009	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	65200000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	20500000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	39100000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	155000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	81400000	USD
CY2009	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	111400000	USD
CY2010	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	-900000	USD
CY2011	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	100000	USD
CY2009	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	-4100000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	600000	USD
CY2009	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	8900000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	7800000	USD
CY2010	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2011	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	2200000	USD
CY2009	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	300000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	100000	USD
CY2009	us-gaap	Profit Loss ProfitLoss	60700000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	93600000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	74800000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1982700000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1805600000	USD
CY2011	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1200000	USD
CY2010	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1100000	USD
CY2009	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1300000	USD
CY2009	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	-5800000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	-2500000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	-4200000	USD
CY2010	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	9900000	USD
CY2011	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	1800000	USD
CY2011	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	-300000	USD
CY2010	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	0	USD
CY2011Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	91300000	USD
CY2010Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	94000000	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	523491	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	37.34
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	42.62
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	43.96
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	-300000	USD
CY2010	us-gaap	Real Estate Improvements RealEstateImprovements	1200000	USD
CY2011	us-gaap	Real Estate Improvements RealEstateImprovements	200000	USD
CY2009	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	766700000	USD
CY2010	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	907000000	USD
CY2011	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	928200000	USD
CY2011Q4	us-gaap	Regulatory Assets RegulatoryAssets	363400000	USD
CY2010Q4	us-gaap	Regulatory Assets RegulatoryAssets	330800000	USD
CY2011Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	17500000	USD
CY2010Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	20600000	USD
CY2010Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	310200000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	345900000	USD
CY2011Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	43500000	USD
CY2010Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	43600000	USD
CY2009	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	9100000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	71000000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	3100000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	431600000	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	399900000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	41.59
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	39.76
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	500000	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	100000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	300000	USD
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	18.85
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	27.76
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	34.25
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	19855	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	44579	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	21676	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	43.16
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	460234	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	646235	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	560887	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Grant Date Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue	6.18
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2009	us-gaap	Share Based Compensation ShareBasedCompensation	2100000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	2200000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	1600000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod	3
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Discount From Market Price Purchase Date ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate	0.05
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	512743	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	460234	shares
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	672419	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	41.68
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	40.05
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	39.99
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	40.69
CY2010Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	14400000	USD
CY2011Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	6500000	USD
CY2010Q4	us-gaap	Short Term Investments ShortTermInvestments	6700000	USD
CY2011Q4	us-gaap	Short Term Investments ShortTermInvestments	0	USD
CY2011Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	5000000	USD
CY2011	us-gaap	Stock Issued During Period Shares Employee Benefit Plan StockIssuedDuringPeriodSharesEmployeeBenefitPlan	507600	shares
CY2009	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	4508	shares
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	80798	shares
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	40769	shares
CY2011	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	20000000	USD
CY2009	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	9600000	USD
CY2010	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	8500000	USD
CY2011	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	7800000	USD
CY2009	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	79300000	USD
CY2010	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	22700000	USD
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	69500000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	976000000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1079300000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	929500000	USD
CY2008Q4	us-gaap	Stockholders Equity StockholdersEquity	827100000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1079300000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	985000000	USD
CY2010Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	22000000	USD
CY2011Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	26400000	USD
CY2010Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	18900000	USD
CY2011Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	15600000	USD
CY2010Q4	us-gaap	Unearned Esop Shares UnearnedESOPShares	36800000	USD
CY2011Q4	us-gaap	Unearned Esop Shares UnearnedESOPShares	29000000	USD
CY2008Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11400000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	12300000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9500000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	-200000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-900000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	500000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4400000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	700000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	1100000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	900000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	200000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	400000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	400000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	-1100000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	600000	USD
CY2009	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	653100000	USD
CY2010	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	771200000	USD
CY2011	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	778200000	USD
CY2010	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	80500000	USD
CY2009	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	64700000	USD
CY2011	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	90400000	USD
CY2010	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	365600000	USD
CY2009	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	308900000	USD
CY2011	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	381200000	USD
CY2011	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	100000	USD
CY2010	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-200000	USD
CY2009	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	100000	USD
CY2010	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	100000	shares
CY2011	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	100000	shares
CY2009	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	35400000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	34300000	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	32200000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	35300000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	32200000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	34200000	shares
CY2011	ale	Equity Method Investment Summarized Financial Information Other Expense EquityMethodInvestmentSummarizedFinancialInformationOtherExpense	81700000	USD
CY2009	ale	Equity Method Investment Summarized Financial Information Other Expense EquityMethodInvestmentSummarizedFinancialInformationOtherExpense	77800000	USD
CY2010	ale	Equity Method Investment Summarized Financial Information Other Expense EquityMethodInvestmentSummarizedFinancialInformationOtherExpense	85900000	USD
CY2011Q4	ale	Equity Method Investment Summarized Financial Information Other Non Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationOtherNonCurrentLiabilities	82600000	USD
CY2010Q4	ale	Equity Method Investment Summarized Financial Information Other Non Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationOtherNonCurrentLiabilities	84900000	USD
CY2011	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2011	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2010Q4	ale	Aggregate Lines Of Credit Available Borrowing Capacity AggregateLinesOfCreditAvailableBorrowingCapacity	153000000	USD
CY2011Q4	ale	Aggregate Lines Of Credit Available Borrowing Capacity AggregateLinesOfCreditAvailableBorrowingCapacity	255300000	USD
CY2011Q4	ale	Aggregate Lines Of Credit Total Borrowing Capacity AggregateLinesOfCreditTotalBorrowingCapacity	256400000	USD
CY2010Q4	ale	Aggregate Lines Of Credit Total Borrowing Capacity AggregateLinesOfCreditTotalBorrowingCapacity	154000000	USD
CY2011Q4	ale	Aggregate Lines Of Credit Used Borrowing Capacity AggregateLinesOfCreditUsedBorrowingCapacity	1100000	USD
CY2010Q4	ale	Aggregate Lines Of Credit Used Borrowing Capacity AggregateLinesOfCreditUsedBorrowingCapacity	1000000	USD
CY2011Q1	ale	Available For Sale Securities Issued By States Of United States Ars AvailableForSaleSecuritiesIssuedByStatesOfUnitedStatesArs	6700000	USD
CY2011Q4	ale	Debt Instrument Actual Indebtedness To Total Capital Ratio DebtInstrumentActualIndebtednessToTotalCapitalRatio	0.44 to 1.00
CY2011	ale	Debt Instrument Required Indebtedness To Total Capital Ratio DebtInstrumentRequiredIndebtednessToTotalCapitalRatio	0.65 to 1.00
CY2010Q4	ale	Deferred Tax Asset Property Related DeferredTaxAssetPropertyRelated	51100000	USD
CY2011Q4	ale	Deferred Tax Asset Property Related DeferredTaxAssetPropertyRelated	56400000	USD
CY2011Q4	ale	Deferred Tax Liability Unamortized Investment Tax Credits DeferredTaxLiabilityUnamortizedInvestmentTaxCredits	12800000	USD
CY2010Q4	ale	Deferred Tax Liability Unamortized Investment Tax Credits DeferredTaxLiabilityUnamortizedInvestmentTaxCredits	13700000	USD
CY2010Q4	ale	Deferred Tax Liabilty Partnership Basis Differences DeferredTaxLiabiltyPartnershipBasisDifferences	19400000	USD
CY2011Q4	ale	Deferred Tax Liabilty Partnership Basis Differences DeferredTaxLiabiltyPartnershipBasisDifferences	24400000	USD
CY2010	ale	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase Range DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncreaseRange	4.3 - 4.6%
CY2011	ale	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase Range DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncreaseRange	4.3 - 4.6%
CY2010	ale	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Range DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseRange	4.3 - 4.6%
CY2009	ale	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Range DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseRange	4.3 - 4.6%
CY2011	ale	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Range DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseRange	4.3 - 4.6%
CY2011	ale	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Expense Discount Rate Range DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitExpenseDiscountRateRange	5.36 - 5.40%
CY2010	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-2000000	USD
CY2009	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-2500000	USD
CY2011	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-1200000	USD
CY2010	ale	Entity Wide Revenue Major Customer Percent Of Total Revenue EntityWideRevenueMajorCustomerPercentOfTotalRevenue	0.125
CY2009	ale	Entity Wide Revenue Major Customer Percent Of Total Revenue EntityWideRevenueMajorCustomerPercentOfTotalRevenue	0.080
CY2011	ale	Entity Wide Revenue Major Customer Percent Of Total Revenue EntityWideRevenueMajorCustomerPercentOfTotalRevenue	0.128
CY2012Q1	ale	Equity Method Investment Additional Investment Amount EquityMethodInvestmentAdditionalInvestmentAmount	800000	USD
CY2011Q4	ale	Equity Method Investment Approved Return On Common Equity EquityMethodInvestmentApprovedReturnOnCommonEquity	0.122
CY2011Q4	ale	Equity Method Investment Expected Future Investment EquityMethodInvestmentExpectedFutureInvestment	3000000	USD
CY2010Q4	ale	Equity Method Investment Summarized Financial Information Long Term Debt EquityMethodInvestmentSummarizedFinancialInformationLongTermDebt	1175000000	USD
CY2011Q4	ale	Equity Method Investment Summarized Financial Information Long Term Debt EquityMethodInvestmentSummarizedFinancialInformationLongTermDebt	1400000000	USD
CY2011	ale	Equity Method Investment Summarized Financial Information Operating Expense EquityMethodInvestmentSummarizedFinancialInformationOperatingExpense	261600000	USD
CY2009	ale	Equity Method Investment Summarized Financial Information Operating Expense EquityMethodInvestmentSummarizedFinancialInformationOperatingExpense	230300000	USD
CY2010	ale	Equity Method Investment Summarized Financial Information Operating Expense EquityMethodInvestmentSummarizedFinancialInformationOperatingExpense	251100000	USD
CY2011	ale	Fair Value Hierarchy Transfers All Levels FairValueHierarchyTransfersAllLevels	0	USD
CY2010	ale	Gain On Real Estate Foreclosure GainOnRealEstateForeclosure	-700000	USD
CY2009	ale	Gain On Real Estate Foreclosure GainOnRealEstateForeclosure	0	USD
CY2011	ale	Gain On Real Estate Foreclosure GainOnRealEstateForeclosure	-500000	USD
CY2010Q4	ale	Gross Trade Accounts Receivable Billed GrossTradeAccountsReceivableBilled	67600000	USD
CY2011Q4	ale	Gross Trade Accounts Receivable Billed GrossTradeAccountsReceivableBilled	63700000	USD
CY2010	ale	Income Loss From Continuing Operations Before Income Taxes Minority Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterest	119100000	USD
CY2009	ale	Income Loss From Continuing Operations Before Income Taxes Minority Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterest	91500000	USD
CY2011	ale	Income Loss From Continuing Operations Before Income Taxes Minority Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterest	129200000	USD
CY2009	ale	Increase Decrease In Operating Liabilities Current IncreaseDecreaseInOperatingLiabilitiesCurrent	5300000	USD
CY2011	ale	Increase Decrease In Operating Liabilities Current IncreaseDecreaseInOperatingLiabilitiesCurrent	15400000	USD
CY2010	ale	Increase Decrease In Operating Liabilities Current IncreaseDecreaseInOperatingLiabilitiesCurrent	5200000	USD
CY2009	ale	Investment In Subsidiary InvestmentInSubsidiary	7800000	USD
CY2010	ale	Investment In Subsidiary InvestmentInSubsidiary	1600000	USD
CY2011	ale	Investment In Subsidiary InvestmentInSubsidiary	2000000	USD
CY2011	ale	Long Term Contract For Purchase Of Electric Power Number Of Wind Ppas LongTermContractForPurchaseOfElectricPowerNumberOfWindPpas	2
CY2011	ale	Morelikelythannotdefined Morelikelythannotdefined	0.50
CY2011Q4	ale	Mpuc Billing Factor Approval Date MpucBillingFactorApprovalDate	May 2011
CY2011Q4	ale	Mpuc Updated Billing Factor Approval Date MpucUpdatedBillingFactorApprovalDate	2012
CY2011Q4	ale	Mpuc Updated Billing Factor Filing Date MpucUpdatedBillingFactorFilingDate	June 29, 2011
CY2011Q4	ale	Nol And Tax Credit Carryforwards Deferred Tax Asset NolAndTaxCreditCarryforwardsDeferredTaxAsset	78100000	USD
CY2010Q4	ale	Nol And Tax Credit Carryforwards Deferred Tax Asset NolAndTaxCreditCarryforwardsDeferredTaxAsset	28200000	USD
CY2011Q4	ale	Number Of Acres Of Land Available For Sale In Acres NumberOfAcresOfLandAvailableForSaleInAcres	5500
CY2011	ale	Performance Period PerformancePeriod	3	Years
CY2010Q1	ale	Performance Share Awards Grant Date Fair Value Total PerformanceShareAwardsGrantDateFairValueTotal	1400000	USD
CY2011	ale	Performance Share Awards Grant Date Fair Value Total PerformanceShareAwardsGrantDateFairValueTotal	1600000	USD
CY2011	ale	Performance Share Grants Grant Date Fair Value Total PerformanceShareGrantsGrantDateFairValueTotal	1400000	USD
CY2012	ale	Performance Shares Awarded PerformanceSharesAwarded	100000	shares
CY2011	ale	Real Estate Sales Revenue Recognition Minimum Contract Price Cash Collections Requirement RealEstateSalesRevenueRecognitionMinimumContractPriceCashCollectionsRequirement	0.20
CY2011Q4	ale	Remaining Cost Basis Impaired Asset RemainingCostBasisImpairedAsset	3000000	USD
CY2011	ale	Restricted Stock Units Awarded Grant Date Fair Value RestrictedStockUnitsAwardedGrantDateFairValue	100000	USD
CY2012	ale	Restricted Stock Units Awarded Grant Date Fair Value RestrictedStockUnitsAwardedGrantDateFairValue	800000	USD
CY2012	ale	Restricted Stock Units Awarded Shares RestrictedStockUnitsAwardedShares	100000	shares
CY2011	ale	Restricted Stock Units Granted Grant Date Fair Value RestrictedStockUnitsGrantedGrantDateFairValue	600000	USD
CY2011	dei	Entity Central Index Key EntityCentralIndexKey	0000066756
CY2012Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	37537154	shares
CY2011	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2011	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2011Q2	dei	Entity Public Float EntityPublicFloat	1488071330	USD
CY2011	dei	Entity Registrant Name EntityRegistrantName	ALLETE INC
CY2011	ale	Stock Issued During Period Shares Purchase Of Non Controlling Interest StockIssuedDuringPeriodSharesPurchaseOfNonControllingInterest	200000	shares
CY2009	ale	Total Operating Revenue TotalOperatingRevenue	759100000	USD
CY2010	ale	Total Operating Revenue TotalOperatingRevenue	907000000	USD
CY2011	ale	Total Operating Revenue TotalOperatingRevenue	928200000	USD
CY2010Q2	ale	Total Operating Revenue TotalOperatingRevenue	211200000	USD
CY2010Q4	ale	Total Operating Revenue TotalOperatingRevenue	238100000	USD
CY2011Q3	ale	Total Operating Revenue TotalOperatingRevenue	226900000	USD
CY2011Q1	ale	Total Operating Revenue TotalOperatingRevenue	242200000	USD
CY2010Q1	ale	Total Operating Revenue TotalOperatingRevenue	233600000	USD
CY2011Q2	ale	Total Operating Revenue TotalOperatingRevenue	219900000	USD
CY2011Q4	ale	Total Operating Revenue TotalOperatingRevenue	239200000	USD
CY2010Q3	ale	Total Operating Revenue TotalOperatingRevenue	224100000	USD
CY2011Q4	ale	Total Trade Accounts Receivable TotalTradeAccountsReceivable	78400000	USD
CY2010Q4	ale	Total Trade Accounts Receivable TotalTradeAccountsReceivable	85600000	USD
CY2011	dei	Amendment Flag AmendmentFlag	false
CY2011	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2011	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2011	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2011
CY2011	dei	Document Period End Date DocumentPeriodEndDate	2011-12-31
CY2011	dei	Document Type DocumentType	10-K

Files In Submission

Name	View Source	Status
0000066756-12-000026-index-headers.html	Edgar Link	pending
0000066756-12-000026-index.html	Edgar Link	pending
0000066756-12-000026.txt	Edgar Link	pending
0000066756-12-000026-xbrl.zip	Edgar Link	pending
ale-20111231.xml	Edgar Link	completed
ale-20111231.xsd	Edgar Link	pending
ale-20111231_cal.xml	Edgar Link	unprocessable
ale-20111231_def.xml	Edgar Link	unprocessable
ale-20111231_lab.xml	Edgar Link	unprocessable
ale-20111231_pre.xml	Edgar Link	unprocessable
ale12312011-10k.htm	Edgar Link	pending
exhibit10h412-31x2011.htm	Edgar Link	pending
exhibit10m1212-31x2011.htm	Edgar Link	pending
exhibit10m1312-31x2011.htm	Edgar Link	pending
exhibit10n1012-31x2011.htm	Edgar Link	pending
exhibit1212-31x2011.htm	Edgar Link	pending
exhibit2112-31x20111.htm	Edgar Link	pending
exhibit23a12-31x2011.htm	Edgar Link	pending
exhibit31a12-31x2011.htm	Edgar Link	pending
exhibit31b12-31x2011.htm	Edgar Link	pending
exhibit3212-31x2011.htm	Edgar Link	pending
exhibit9512-31x2011.htm	Edgar Link	pending
exhibit9912-31x2011.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
logoallete.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$ALE
ALLETE INC Stock $ale

2011 Q4 Form 10-K Financial Statement

#000006675612000026 Filed on February 15, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALE ALLETE INC Stock $ale

2011 Q4 Form 10-K Financial Statement

#000006675612000026 Filed on February 15, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALE
ALLETE INC Stock $ale