$ALE
ALLETE INC Stock $ale

$ale Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000006675613000030 Filed on February 15, 2013

Income Statement

Concept	2011 Q4	2011 Q3	2011 Q2
Revenue	$239.2M	$226.9M	$219.9M
YoY Change	0.46%	1.25%	4.12%
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	$22.70M	$22.10M
YoY Change	12.56%	13.5%	11.62%
% of Gross Profit
Operating Expenses	$205.0M	$188.0M	$193.8M
YoY Change	-4.83%	-0.42%	7.97%
Operating Profit	$34.20M	$38.90M	$26.10M
YoY Change	50.66%	10.2%	-17.67%
Interest Expense	-$5.000M	$10.90M	$11.00M
YoY Change	-23.08%	12.37%	-389.47%
% of Operating Profit	-14.62%	28.02%	42.15%
Other Income/Expense, Net	$800.0K	-$5.700M	-$5.400M
YoY Change	14.29%	23.91%	-700.0%
Pretax Income	$30.00M	$33.20M	$20.70M
YoY Change	77.51%	8.14%	-28.13%
Income Tax	$10.90M	$12.70M	$3.800M
% Of Pretax Income	36.33%	38.25%	18.36%
Net Earnings	$19.10M	$20.50M	$17.00M
YoY Change	43.61%	4.59%	-12.37%
Net Earnings / Revenue	7.98%	9.03%	7.73%
Basic Earnings Per Share	$0.53	$0.57	$0.49
Diluted Earnings Per Share	$0.53	$0.57	$0.48
COMMON SHARES
Basic Shares Outstanding		35.60M shares	35.00M shares
Diluted Shares Outstanding		35.70M shares	35.10M shares

Balance Sheet

Concept	2011 Q4	2011 Q3	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$101.1M	$135.1M	$79.40M
YoY Change	95.93%	46.37%	75.28%
Cash & Equivalents	$101.1M	$135.1M	$79.40M
Short-Term Investments	$0.00	$0.00	$0.00
Other Short-Term Assets	$9.600M	$5.700M	$20.60M
YoY Change	20.0%	-78.65%	-5.94%
Inventory	$69.10M	$69.10M	$61.30M
Prepaid Expenses	$27.10M
Receivables	$79.70M	$75.80M	$71.90M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$277.0M	$302.8M	$233.2M
YoY Change	15.56%	2.99%	0.43%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.983B	$1.902B	$1.861B
YoY Change	9.81%	9.15%	11.33%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$98.90M	$97.90M	$225.3M
YoY Change	6.0%	-56.76%	1.17%
Other Assets	$39.20M	$35.20M	$325.9M
YoY Change	14.29%	-88.86%	1.46%
Total Long-Term Assets	$2.599B	$2.452B	$2.412B
YoY Change	9.69%	7.29%	8.88%
TOTAL ASSETS
Total Short-Term Assets	$277.0M	$302.8M	$233.2M
Total Long-Term Assets	$2.599B	$2.452B	$2.412B
Total Assets	$2.876B	$2.754B	$2.646B
YoY Change	10.23%	6.8%	8.08%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$71.80M	$44.10M	$44.40M
YoY Change	-4.77%	-33.68%	-20.71%
Accrued Expenses	$12.80M	$13.00M	$12.80M
YoY Change	-4.48%	5.69%	0.79%
Deferred Revenue
YoY Change
Short-Term Debt	$6.500M	$5.600M	$2.500M
YoY Change	-54.86%	460.0%	78.57%
Long-Term Debt Due	$5.400M	$12.80M	$12.90M
YoY Change	-59.7%	700.0%	706.25%
Total Short-Term Liabilities	$163.1M	$122.0M	$116.0M
YoY Change	2.64%	-6.87%	-2.68%
LONG-TERM LIABILITIES
Long-Term Debt	$857.9M	$844.4M	$770.7M
YoY Change	11.18%	7.68%	8.61%
Other Long-Term Liabilities	$105.1M	$101.9M	$367.2M
YoY Change	12.53%	-71.6%	-0.89%
Total Long-Term Liabilities	$963.0M	$946.3M	$1.138B
YoY Change	11.33%	-17.21%	5.35%
TOTAL LIABILITIES
Total Short-Term Liabilities	$163.1M	$122.0M	$116.0M
Total Long-Term Liabilities	$963.0M	$946.3M	$1.138B
Total Liabilities	$1.797B	$1.703B	$1.617B
YoY Change	10.63%	6.16%	8.82%
SHAREHOLDERS EQUITY
Retained Earnings	$431.6M	$427.7M
YoY Change	7.93%
Common Stock	$705.6M	$676.7M
YoY Change	10.93%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.079B	$1.051B	$1.029B
YoY Change
Total Liabilities & Shareholders Equity	$2.876B	$2.754B	$2.646B
YoY Change	10.23%	6.8%	8.08%

Cashflow Statement

Concept	2011 Q4	2011 Q3	2011 Q2
OPERATING ACTIVITIES
Net Income	$19.10M	$20.50M	$17.00M
YoY Change	43.61%	4.59%	-12.37%
Depreciation, Depletion And Amortization	$23.30M	$22.70M	$22.10M
YoY Change	12.56%	13.5%	11.62%
Cash From Operating Activities	$56.60M	$55.10M	$60.90M
YoY Change	39.07%	-30.69%	17.57%
INVESTING ACTIVITIES
Capital Expenditures	-$82.40M	-$65.20M	-$40.10M
YoY Change	8.14%	-30.04%	27.71%
Acquisitions
YoY Change
Other Investing Activities	-$3.600M	-$2.700M	-$1.200M
YoY Change	-220.0%	17.39%	-233.33%
Cash From Investing Activities	-$86.00M	-$67.90M	-$41.30M
YoY Change	17.49%	-28.9%	35.41%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-4.600M	68.50M	7.100M
YoY Change	-69.13%	8.73%	-183.53%
NET CHANGE
Cash From Operating Activities	56.60M	55.10M	60.90M
Cash From Investing Activities	-86.00M	-67.90M	-41.30M
Cash From Financing Activities	-4.600M	68.50M	7.100M
Net Change In Cash	-34.00M	55.70M	26.70M
YoY Change	-28.27%	18.51%	108.59%
FREE CASH FLOW
Cash From Operating Activities	$56.60M	$55.10M	$60.90M
Capital Expenditures	-$82.40M	-$65.20M	-$40.10M
Free Cash Flow	$139.0M	$120.3M	$101.0M
YoY Change	18.91%	-30.34%	21.39%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	71800000	USD
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	90500000	USD
CY2012Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	70400000	USD
CY2011Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	63700000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	79700000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	7800000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	600000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2012	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
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	-1100000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	89000000	USD
CY2011Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	12800000	USD
CY2012Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	11900000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-28900000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-22000000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2100000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1600000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2200000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	900000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1000000	USD
CY2011Q4	us-gaap	Allowance For Notes And Loans Receivable Noncurrent AllowanceForNotesAndLoansReceivableNoncurrent	600000	USD
CY2012Q4	us-gaap	Allowance For Notes And Loans Receivable Noncurrent AllowanceForNotesAndLoansReceivableNoncurrent	600000	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	900000	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	900000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1000000	USD
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2011	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1700000	USD
CY2010	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	57000000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	77900000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	50300000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	6400000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3800000	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2800000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	300000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	17100000	USD
CY2012Q4	us-gaap	Assets Assets	3253400000	USD
CY2011Q4	us-gaap	Assets Assets	2876000000	USD
CY2010Q4	us-gaap	Assets Assets	2609100000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	277000000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	273200000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	27300000	USD
CY2010Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	27400000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	27400000	USD
CY2012Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	26800000	USD
CY2010Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	25200000	USD
CY2011Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	24700000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	1500000	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
CY2011Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	24700000	USD
CY2012Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	26800000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-500000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	500000	USD
CY2010Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	200000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	100000	USD
CY2012Q4	us-gaap	Bankruptcy Claims Amount Of Claims Settled BankruptcyClaimsAmountOfClaimsSettled	3200000	USD
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	20200000	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	5900000	USD
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
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	80800000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	25700000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	44900000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	56200000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	19200000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-20300000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.84
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.78
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.76
CY2012Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2011Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2012Q4	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
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	39400000	shares
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	705600000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	784700000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	104000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	88100000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	76100000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-200000	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
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	104000000	USD
CY2012	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	308700000	USD
CY2010	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	325100000	USD
CY2011	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	306600000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-23000000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1400000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-200000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	500000	USD
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CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	500000	USD
CY2012Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	28800000	USD
CY2011Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	16300000	USD
CY2011Q4	us-gaap	Debt Current DebtCurrent	6500000	USD
CY2012Q4	us-gaap	Debt Current DebtCurrent	84500000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	61400000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	27300000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	38100000	USD
CY2011Q4	us-gaap	Deferred Fuel Cost DeferredFuelCost	17500000	USD
CY2012Q4	us-gaap	Deferred Fuel Cost DeferredFuelCost	22500000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	35800000	USD
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CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	61700000	USD
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CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	20400000	USD
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CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	12200000	USD
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CY2012Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	6900000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	373600000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	423800000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	24000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	30100000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	577100000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	482700000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	104300000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	117900000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Number Of Shares Of Equity Securities Issued By Employer And Related Parties Included In Plan Assets DefinedBenefitPlanNumberOfSharesOfEquitySecuritiesIssuedByEmployerAndRelatedPartiesIncludedInPlanAssets	500000	shares
CY2010	us-gaap	Depreciation Depreciation	80500000	USD
CY2011	us-gaap	Depreciation Depreciation	90400000	USD
CY2012	us-gaap	Depreciation Depreciation	100200000	USD
CY2010	us-gaap	Dividends Common Stock DividendsCommonStock	-60800000	USD
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2012	us-gaap	Dividends Common Stock DividendsCommonStock	-69100000	USD
CY2011	us-gaap	Dividends Common Stock DividendsCommonStock	-62100000	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.66
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.20
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.59
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.07
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.78
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.49
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.39
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.66
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.76
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.65
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.58
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.19
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.53
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.07
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.75
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.372
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.281
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
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2012	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 Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
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
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	900000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	700000	USD
CY2010	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	7100000	USD
CY2012	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	7700000	USD
CY2011	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	7400000	USD
CY2012	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.
CY2010Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	48400000	USD
CY2012Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	28700000	USD
CY2011Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	42000000	USD
CY2010Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	2200000	shares
CY2011Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	2200000	shares
CY2012Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	2200000	shares
CY2012Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	700000	shares
CY2011Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	1000000	shares
CY2010Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	1300000	shares
CY2011Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	3200000	shares
CY2012Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	2900000	shares
CY2010Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	3500000	shares
CY2012Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	28000000	USD
CY2011Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	28600000	USD
CY2012	us-gaap	Entity Wide Revenue Major Customer Percentage EntityWideRevenueMajorCustomerPercentage	0.123
CY2010	us-gaap	Entity Wide Revenue Major Customer Percentage EntityWideRevenueMajorCustomerPercentage	0.125
CY2011	us-gaap	Entity Wide Revenue Major Customer Percentage EntityWideRevenueMajorCustomerPercentage	0.128
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	-14800000	USD
CY2012	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	-15700000	USD
CY2012Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.08
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	3337800000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	3112400000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	63100000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	58700000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	298500000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	251500000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity EquityMethodInvestmentSummarizedFinancialInformationEquity	1440500000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity EquityMethodInvestmentSummarizedFinancialInformationEquity	1331300000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	3337800000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	3112400000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	223900000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	237400000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	219700000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	3053700000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	3274700000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	567200000	USD
CY2012Q4	us-gaap	Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService	435900000	USD
CY2012Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress	50400000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	603200000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	556700000	USD
CY2012Q4	us-gaap	Equity Method Investments EquityMethodInvestments	107300000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	98900000	USD
CY2010Q4	us-gaap	Equity Method Investments EquityMethodInvestments	93300000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38000000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35600000	USD
CY2012	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	200000	USD
CY2010	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	0	USD
CY2011	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-900000	USD
CY2012	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2011	us-gaap	Impairment Of Investments ImpairmentOfInvestments	-1700000	USD
CY2012	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
CY2011	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	-1700000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-54200000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	129200000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	119100000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	135100000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	19400000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	18400000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	17900000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-3700000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-3100000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-3200000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44300000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	47300000	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
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1000000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-700000	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
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4500000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1200000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	7600000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	1600000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	4300000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-11400000	USD
CY2010	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	4200000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2011Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	1300000	USD
CY2012Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	2200000	USD
CY2012	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-10100000	USD
CY2010	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	17900000	USD
CY2011	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	18600000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-9500000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	5800000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-1500000	USD
CY2011	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	2500000	USD
CY2010	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	4200000	USD
CY2012	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	5100000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-700000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-9100000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-3000000	USD
CY2010	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	5200000	USD
CY2011	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	15400000	USD
CY2012	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	21800000	USD
CY2011	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-7500000	USD
CY2012	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-20900000	USD
CY2010	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-400000	USD
CY2011	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	7900000	USD
CY2012	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	800000	USD
CY2010	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-39300000	USD
CY2012	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-8800000	USD
CY2011	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-24700000	USD
CY2012	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-6500000	USD
CY2011	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1500000	USD
CY2010	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-4300000	USD
CY2010	us-gaap	Interest Expense InterestExpense	39200000	USD
CY2012	us-gaap	Interest Expense InterestExpense	45500000	USD
CY2011	us-gaap	Interest Expense InterestExpense	43600000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	43200000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	42700000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	35700000	USD
CY2012Q4	us-gaap	Interest Payable Current InterestPayableCurrent	15600000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	12800000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	69100000	USD
CY2012Q4	us-gaap	Inventory Net InventoryNet	69800000	USD
CY2011Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	40500000	USD
CY2012Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	41800000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	241700000	USD
CY2012Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation	188500000	USD
CY2010Q4	us-gaap	Land Available For Sale LandAvailableForSale	86000000	USD
CY2011Q4	us-gaap	Land Available For Sale LandAvailableForSale	86000000	USD
CY2012Q4	us-gaap	Land Available For Sale LandAvailableForSale	86500000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	11500000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9400000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9400000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	1796700000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	2052400000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2876000000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3253400000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	283400000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	163100000	USD
CY2012Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	0	USD
CY2011Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	1100000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	863300000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	1018100000	USD
CY2012Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	84500000	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	5400000	USD
CY2011Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	966400000	USD
CY2012Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	1143700000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	748500000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	51200000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	21700000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	17400000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	94800000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	857900000	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	933600000	USD
CY2011Q4	us-gaap	Long Term Investments LongTermInvestments	132300000	USD
CY2012Q4	us-gaap	Long Term Investments LongTermInvestments	143500000	USD
CY2011Q3	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	8800000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	160200000	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
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-250900000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-420100000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-240900000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	228700000	USD
CY2012Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	33800000	USD
CY2012Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	45400000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	239600000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	75300000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	93800000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	97100000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	29400000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	19100000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	37200000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	17000000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	20500000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	14400000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	28900000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	24400000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-200000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-500000	USD
CY2011	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	93800000	USD
CY2012	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	97100000	USD
CY2010	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	75300000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-20100000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-16700000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-20800000	USD
CY2012Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	1400000	USD
CY2011Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	2000000	USD
CY2011Q4	us-gaap	Notes Payable Current NotesPayableCurrent	1100000	USD
CY2012Q4	us-gaap	Notes Payable Current NotesPayableCurrent	0	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	135800000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	150000000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	155200000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	26100000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	23300000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	38900000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	50800000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	34200000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	38400000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	45600000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	47900000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	11500000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	8500000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	9300000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	11400000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	11700000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	35000000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	29300000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	48100000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	9600000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	11100000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	39200000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	41500000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6900000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	800000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5700000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	5100000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-5900000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	3900000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-3600000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-300000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-200000	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
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-100000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	1200000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	800000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-300000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	1100000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-300000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	800000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1200000	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
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	800000	USD
CY2012	us-gaap	Other Income OtherIncome	900000	USD
CY2010	us-gaap	Other Income OtherIncome	400000	USD
CY2011	us-gaap	Other Income OtherIncome	1900000	USD
CY2012Q4	us-gaap	Other Investments OtherInvestments	25600000	USD
CY2011Q4	us-gaap	Other Investments OtherInvestments	16300000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	62600000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	45600000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	105100000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	123300000	USD
CY2011Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	132300000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	39100000	USD
CY2012Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	143500000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4600000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6000000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4400000	USD
CY2011Q4	us-gaap	Other Real Estate OtherRealEstate	3300000	USD
CY2012Q4	us-gaap	Other Real Estate OtherRealEstate	3200000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1300000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	9600000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	7400000	USD
CY2010	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1400000	USD
CY2011	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2012	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1300000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	69100000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	60800000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	62100000	USD
CY2012	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1800000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2300000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2300000	USD
CY2013Q1	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	400000	USD
CY2012	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	4700000	USD
CY2011	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	2000000	USD
CY2011	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	2000000	USD
CY2010	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	1600000	USD
CY2012	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	4700000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	405800000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	239200000	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
CY2012	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	27500000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	18000000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	228200000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	253500000	USD
CY2012Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	33600000	USD
CY2011Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	27100000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	77000000	USD
CY2011	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	246800000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2347600000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1982700000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	20500000	USD
CY2012	us-gaap	Proceeds From Issuance Of First Mortgage Bond ProceedsFromIssuanceOfFirstMortgageBond	160000000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	180600000	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
CY2011	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	100000	USD
CY2010	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	-900000	USD
CY2012	us-gaap	Proceeds From Repayments Of Notes Payable ProceedsFromRepaymentsOfNotesPayable	-1100000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	7800000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1500000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	600000	USD
CY2012	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	300000	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
CY2012	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	100000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	97100000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	93600000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	74800000	USD
CY2012	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	432200000	USD
CY2010	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	260000000	USD
CY2011	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1200000	USD
CY2010	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1100000	USD
CY2012	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1000000	USD
CY2012Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	240000000	USD
CY2012	us-gaap	Real Estate Acquisitions Through Foreclosures RealEstateAcquisitionsThroughForeclosures	500000	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
CY2012	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	-200000	USD
CY2012Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	91100000	USD
CY2011Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	91300000	USD
CY2012	us-gaap	Real Estate Improvements RealEstateImprovements	200000	USD
CY2011	us-gaap	Real Estate Improvements RealEstateImprovements	200000	USD
CY2012	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	961200000	USD
CY2011	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	928200000	USD
CY2010	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	907000000	USD
CY2012Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	216400000	USD
CY2011Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	219900000	USD
CY2012Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	248800000	USD
CY2011Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	239200000	USD
CY2011Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	226900000	USD
CY2011Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	242200000	USD
CY2012Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	256000000	USD
CY2011Q4	us-gaap	Regulatory Assets RegulatoryAssets	363400000	USD
CY2012Q4	us-gaap	Regulatory Assets RegulatoryAssets	362800000	USD
CY2012Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	22500000	USD
CY2011Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	17500000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	345900000	USD
CY2012Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	340300000	USD
CY2012Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	60100000	USD
CY2011Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	43500000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	3100000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	71000000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	25900000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	459600000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	431600000	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	523491	shares
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	2100000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	460234	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	395678	shares
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	1600000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	2200000	USD
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	42.28
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	40.05
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	34.25
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	35.84
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	27.76
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	44.86
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	43.16
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	43.96
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CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	41.59
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	41.71
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	300000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	300000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	500000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	19855	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	15481	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	44579	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2010	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
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
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	395678	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	40.69
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	41.68
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2012Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	2500000	USD
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	40769	shares
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	80798	shares
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	49075	shares
CY2012	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0	USD
CY2011	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	-20000000	USD
CY2010	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0	USD
CY2012	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	7700000	USD
CY2011	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	7800000	USD
CY2010	us-gaap	Stock Issued During Period Value Employee Stock Ownership Plan StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	8500000	USD
CY2010	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	22700000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	79100000	USD
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	69500000	USD
CY2011Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	26400000	USD
CY2012Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	17400000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	976000000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	929500000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1079300000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	1201000000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1079300000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1201000000	USD
CY2012Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	30200000	USD
CY2011Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	15600000	USD
CY2011Q4	us-gaap	Unearned Esop Shares UnearnedESOPShares	29000000	USD
CY2012Q4	us-gaap	Unearned Esop Shares UnearnedESOPShares	21300000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	12300000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11400000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2700000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9500000	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 Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-900000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-8700000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	-300000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2012	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4400000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2010	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	80500000	USD
CY2011	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	90400000	USD
CY2012	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	397100000	USD
CY2011	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	381200000	USD
CY2010	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	365600000	USD
CY2011	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	100000	USD
CY2012	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-2000000	USD
CY2010	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-200000	USD
CY2012	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
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
CY2010Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	700000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	500000	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
CY2012	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-600000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	-1100000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	500000	USD
CY2010	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	771200000	USD
CY2012	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	806000000	USD
CY2011	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	778200000	USD
CY2012	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	100200000	USD
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	34300000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	37600000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	35400000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	35300000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	37600000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	34200000	shares
CY2012Q4	ale	Accounts Receivable Current Net Net Of Income Taxes Receivable AccountsReceivableCurrentNetNetOfIncomeTaxesReceivable	86800000	USD
CY2011Q4	ale	Accounts Receivable Current Net Net Of Income Taxes Receivable AccountsReceivableCurrentNetNetOfIncomeTaxesReceivable	78400000	USD
CY2011Q1	ale	Available For Sale Securities Issued By States Of United States Ars AvailableForSaleSecuritiesIssuedByStatesOfUnitedStatesArs	6700000	USD
CY2012Q4	ale	Debt Instrument Actual Indebtedness To Total Capital Ratio DebtInstrumentActualIndebtednessToTotalCapitalRatio	0.46
CY2012	ale	Debt Instrument Required Indebtedness To Total Capital Ratio DebtInstrumentRequiredIndebtednessToTotalCapitalRatio	0.65
CY2012Q4	ale	Deferred Tax Liabilty Partnership Basis Differences DeferredTaxLiabiltyPartnershipBasisDifferences	28600000	USD
CY2011Q4	ale	Deferred Tax Liabilty Partnership Basis Differences DeferredTaxLiabiltyPartnershipBasisDifferences	24400000	USD
CY2012	ale	Defined Contribution Plan Employer Matching Contribution Amount DefinedContributionPlanEmployerMatchingContributionAmount	7700000	USD
CY2011	ale	Defined Contribution Plan Employer Matching Contribution Amount DefinedContributionPlanEmployerMatchingContributionAmount	7300000	USD
CY2010	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-2000000	USD
CY2012	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-2200000	USD
CY2011	ale	Effective Income Tax Rate Reconciliation Regulatory Differences EffectiveIncomeTaxRateReconciliationRegulatoryDifferences	-1200000	USD
CY2012Q4	ale	Equity Method Investment Approved Return On Common Equity EquityMethodInvestmentApprovedReturnOnCommonEquity	0.122
CY2012Q4	ale	Equity Method Investment Expected Future Investment EquityMethodInvestmentExpectedFutureInvestment	2000000	USD
CY2012Q4	ale	Equity Method Investment Summarized Financial Information Long Term Debt EquityMethodInvestmentSummarizedFinancialInformationLongTermDebt	1550000000	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
CY2012	ale	Equity Method Investment Summarized Financial Information Operating Expense EquityMethodInvestmentSummarizedFinancialInformationOperatingExpense	281000000	USD
CY2010	ale	Equity Method Investment Summarized Financial Information Operating Expense EquityMethodInvestmentSummarizedFinancialInformationOperatingExpense	251100000	USD
CY2010	ale	Equity Method Investment Summarized Financial Information Other Expense EquityMethodInvestmentSummarizedFinancialInformationOtherExpense	85900000	USD
CY2012	ale	Equity Method Investment Summarized Financial Information Other Expense EquityMethodInvestmentSummarizedFinancialInformationOtherExpense	84800000	USD
CY2011	ale	Equity Method Investment Summarized Financial Information Other Expense EquityMethodInvestmentSummarizedFinancialInformationOtherExpense	81700000	USD
CY2011Q4	ale	Equity Method Investment Summarized Financial Information Other Non Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationOtherNonCurrentLiabilities	82600000	USD
CY2012Q4	ale	Equity Method Investment Summarized Financial Information Other Non Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationOtherNonCurrentLiabilities	95800000	USD
CY2012	ale	Fair Value Activity In Level3 FairValueActivityInLevel3	0	USD
CY2012	ale	Fair Value Hierarchy Transfers All Levels FairValueHierarchyTransfersAllLevels	0	USD
CY2011	ale	Fair Value Hierarchy Transfers All Levels FairValueHierarchyTransfersAllLevels	0	USD
CY2011	ale	Gain On Real Estate Foreclosure GainOnRealEstateForeclosure	-500000	USD
CY2012	ale	Gain On Real Estate Foreclosure GainOnRealEstateForeclosure	0	USD
CY2010	ale	Gain On Real Estate Foreclosure GainOnRealEstateForeclosure	-700000	USD
CY2012Q4	ale	Letter Of Credit Maximum Issuances LetterOfCreditMaximumIssuances	50000000	USD
CY2012	ale	Morelikelythannotdefined Morelikelythannotdefined	0.50
CY2012	ale	Real Estate Sales Revenue Recognition Minimum Contract Price Cash Collections Requirement RealEstateSalesRevenueRecognitionMinimumContractPriceCashCollectionsRequirement	0.20
CY2011Q3	ale	Stock Issued During Period Shares Purchase Of Non Controlling Interest StockIssuedDuringPeriodSharesPurchaseOfNonControllingInterest	200000	shares
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0000066756
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	39468463	shares
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	1591836880	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	ALLETE INC
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0000066756-13-000030-index-headers.html	Edgar Link	pending
0000066756-13-000030-index.html	Edgar Link	pending
0000066756-13-000030.txt	Edgar Link	pending
0000066756-13-000030-xbrl.zip	Edgar Link	pending
ale-20121231.xml	Edgar Link	completed
ale-20121231.xsd	Edgar Link	pending
ale-20121231_cal.xml	Edgar Link	unprocessable
ale-20121231_def.xml	Edgar Link	unprocessable
ale-20121231_lab.xml	Edgar Link	unprocessable
ale-20121231_pre.xml	Edgar Link	unprocessable
ale12312012-10k.htm	Edgar Link	pending
ex10f512-31x2012.htm	Edgar Link	pending
ex10k1512-31x2012.htm	Edgar Link	pending
ex10n512-31x2012.htm	Edgar Link	pending
ex10o212-31x2012.htm	Edgar Link	pending
ex10p212-31x2012.htm	Edgar Link	pending
exhibit10j12-31x2012.htm	Edgar Link	pending
exhibit10k1412-31x2012.htm	Edgar Link	pending
exhibit1212-31x2012.htm	Edgar Link	pending
exhibit2112-31x2012.htm	Edgar Link	pending
exhibit2312-31x2012.htm	Edgar Link	pending
exhibit31a12-31x2012.htm	Edgar Link	pending
exhibit31b12-31x2012.htm	Edgar Link	pending
exhibit3212-31x2012.htm	Edgar Link	pending
exhibit9512-31x2012.htm	Edgar Link	pending
exhibit9912-31x2012.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

#000006675613000030 Filed on February 15, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALE ALLETE INC Stock $ale

2011 Q4 Form 10-K Financial Statement

#000006675613000030 Filed on February 15, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ALE
ALLETE INC Stock $ale