$WEC
WEC ENERGY GROUP, INC. Stock $wec

$wec Overview Financials Valuation SEC Filings Company Website

2011 Form 10-K Financial Statement

#000010781512000039 Filed on February 28, 2012

Income Statement

Concept	2011	2010 Q4	2010
Revenue	$4.486B	$1.090B	$4.203B
YoY Change	6.76%	2.69%	2.48%
Cost Of Revenue	$728.7M	$232.5M	$751.5M
YoY Change	-3.03%	-4.75%	-17.6%
Gross Profit	$3.758B	$857.3M	$3.451B
YoY Change	8.89%	4.91%	8.22%
Gross Profit Margin	83.76%	78.67%	82.12%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$330.2M	$79.80M	$305.6M
YoY Change	8.05%	0.88%	-10.9%
% of Gross Profit	8.79%	9.31%	8.86%
Operating Expenses	$2.870B	$688.2M	$2.839B
YoY Change	1.11%	2.0%	2.89%
Operating Profit	$887.3M	$169.1M	$810.4M
YoY Change	9.49%	18.67%	22.73%
Interest Expense	$235.8M	-$36.90M	$206.4M
YoY Change	14.24%	66.22%	31.72%
% of Operating Profit	26.58%	-21.82%	25.47%
Other Income/Expense, Net	$62.70M	$14.70M	$40.20M
YoY Change	55.97%	226.67%	41.05%
Pretax Income	$776.7M	$193.5M	$704.3M
YoY Change	10.28%	8.52%	19.13%
Income Tax	$263.9M	$67.90M	$249.9M
% Of Pretax Income	33.98%	35.09%	35.48%
Net Earnings	$526.2M	$125.9M	$456.5M
YoY Change	15.27%	6.07%	19.38%
Net Earnings / Revenue	11.73%	11.55%	10.86%
Basic Earnings Per Share	$2.26		$1.95
Diluted Earnings Per Share	$2.24	$0.53	$1.93
COMMON SHARES
Basic Shares Outstanding	232.6M shares		233.8M shares
Diluted Shares Outstanding	235.4M shares		236.7M shares

Balance Sheet

Concept	2011	2010 Q4	2010
SHORT-TERM ASSETS
Cash & Short-Term Investments	$14.00M	$25.00M	$25.00M
YoY Change	-44.0%	25.0%	25.0%
Cash & Equivalents	$14.00M	$24.50M	$25.00M
Short-Term Investments
Other Short-Term Assets	$273.0M	$85.00M	$219.0M
YoY Change	24.66%	-84.35%	-59.67%
Inventory	$382.0M	$379.0M	$379.0M
Prepaid Expenses		$125.6M
Receivables	$602.0M	$344.6M	$625.0M
Other Receivables	$155.0M	$84.00M	$84.00M
Total Short-Term Assets	$1.426B	$1.331B	$1.331B
YoY Change	7.14%	-12.94%	-12.95%
LONG-TERM ASSETS
Property, Plant & Equipment	$10.16B	$9.602B	$9.602B
YoY Change	5.82%	6.49%	6.5%
Goodwill		$441.9M
YoY Change
Intangibles
YoY Change
Long-Term Investments	$393.0M	$376.0M	$376.0M
YoY Change	4.52%	4.74%	4.74%
Other Assets	$1.440B	$218.9M	$1.309B
YoY Change	10.01%	-83.81%	-3.18%
Total Long-Term Assets	$12.44B	$11.73B	$11.73B
YoY Change	6.03%	5.01%	5.01%
TOTAL ASSETS
Total Short-Term Assets	$1.426B	$1.331B	$1.331B
Total Long-Term Assets	$12.44B	$11.73B	$11.73B
Total Assets	$13.86B	$13.06B	$13.06B
YoY Change	6.14%	2.85%	2.85%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$326.0M	$315.4M	$315.0M
YoY Change	3.49%	8.38%	8.25%
Accrued Expenses	$106.0M	$88.00M	$88.00M
YoY Change	20.45%
Deferred Revenue
YoY Change
Short-Term Debt	$670.0M	$658.0M	$658.0M
YoY Change	1.82%	-20.24%	-20.24%
Long-Term Debt Due	$33.00M	$473.4M	$473.0M
YoY Change	-93.02%	59.93%	59.8%
Total Short-Term Liabilities	$1.365B	$1.721B	$1.721B
YoY Change	-20.69%	-9.13%	-9.13%
LONG-TERM LIABILITIES
Long-Term Debt	$4.614B	$3.932B	$3.932B
YoY Change	17.34%	1.44%	1.44%
Other Long-Term Liabilities	$2.194B	$376.9M	$2.419B
YoY Change	-9.3%	-83.43%	6.33%
Total Long-Term Liabilities	$6.808B	$4.309B	$6.351B
YoY Change	7.2%	-29.95%	3.25%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.365B	$1.721B	$1.721B
Total Long-Term Liabilities	$6.808B	$4.309B	$6.351B
Total Liabilities	$9.868B	$6.030B	$9.227B
YoY Change	6.95%	-33.74%	1.38%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock		$3.802B
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.994B	$3.802B	$3.833B
YoY Change
Total Liabilities & Shareholders Equity	$13.86B	$13.06B	$13.06B
YoY Change	6.14%	2.85%	2.85%

Cashflow Statement

Concept	2011	2010 Q4	2010
OPERATING ACTIVITIES
Net Income	$526.2M	$125.9M	$456.5M
YoY Change	15.27%	6.07%	19.38%
Depreciation, Depletion And Amortization	$330.2M	$79.80M	$305.6M
YoY Change	8.05%	0.88%	-10.9%
Cash From Operating Activities	$993.4M	$156.7M	$810.4M
YoY Change	22.58%	-19.72%	28.86%
INVESTING ACTIVITIES
Capital Expenditures	$830.8M	$252.6M	$798.2M
YoY Change	4.08%	-3.4%	-2.01%
Acquisitions
YoY Change
Other Investing Activities	$42.50M	$29.10M	$85.00M
YoY Change	-50.0%	1978.57%	-18.58%
Cash From Investing Activities	-$892.5M	-$223.5M	-$633.5M
YoY Change	40.88%	-14.07%	-13.94%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$193.9M		$156.6M
YoY Change	23.82%		429.05%
Debt Paid & Issued, Net	$466.6M		$291.7M
YoY Change	59.96%		31.93%
Cash From Financing Activities	-$111.3M	80.10M	-$172.6M
YoY Change	-35.52%	6.23%	-280.36%
NET CHANGE
Cash From Operating Activities	$993.4M	156.7M	$810.4M
Cash From Investing Activities	-$892.5M	-223.5M	-$633.5M
Cash From Financing Activities	-$111.3M	80.10M	-$172.6M
Net Change In Cash	-$10.40M	13.30M	$4.300M
YoY Change	-341.86%	26.67%	-137.39%
FREE CASH FLOW
Cash From Operating Activities	$993.4M	$156.7M	$810.4M
Capital Expenditures	$830.8M	$252.6M	$798.2M
Free Cash Flow	$162.6M	-$95.90M	$12.20M
YoY Change	1232.79%	44.65%	-106.57%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2010Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	315400000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	325700000	USD
CY2010Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	344600000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	349400000	USD
CY2010Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3624000000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3797800000	USD
CY2011	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	830800000	USD
CY2009	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	814600000	USD
CY2010	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	798200000	USD
CY2009	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11300000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9100000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4400000	USD
CY2009	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	6300000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	11900000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	21900000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	28500000	USD
CY2009	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	25800000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	35100000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	58100000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	61700000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	52600000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	55500000	USD
CY2009Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	57900000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3000000	USD
CY2010	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3100000	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	600000	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	2500000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	2200000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	1500000	USD
CY2010	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-5900000	USD
CY2010Q4	us-gaap	Assets Assets	13059800000	USD
CY2011Q4	us-gaap	Assets Assets	13862100000	USD
CY2009Q4	us-gaap	Assets Assets	12697900000	USD
CY2010Q4	us-gaap	Assets Current AssetsCurrent	1331100000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	1426200000	USD
CY2011Q4	us-gaap	Assets Held For Sale Long Lived AssetsHeldForSaleLongLived	0	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	16700000	USD
CY2010	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	18200000	USD
CY2009	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	14700000	USD
CY2010Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	141900000	USD
CY2011Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	132400000	USD
CY2011Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	12400000	USD
CY2011Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	120000000	USD
CY2010Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	140300000	USD
CY2011Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	140300000	USD
CY2010Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	64800000	USD
CY2011Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	59200000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	295200000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	38900000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	45100000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	43500000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	41900000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	40400000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	85400000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Executory Costs CapitalLeasesFutureMinimumPaymentsExecutoryCosts	74900000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	87900000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Net Minimum Payments CapitalLeasesFutureMinimumPaymentsNetMinimumPayments	220300000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	132400000	USD
CY2011Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	81100000	USD
CY2010Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	75500000	USD
CY2010Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	7764500000	USD
CY2011Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	8608000000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	14100000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	24500000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	20200000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	31700000	USD
CY2009	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-11500000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	4300000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-10400000	USD
CY2011	us-gaap	Debt Instrument Restrictive Covenants DebtInstrumentRestrictiveCovenants	The RCC provides that we may not redeem, defease or purchase and our subsidiaries may not purchase any Junior Notes on or before May 15, 2037, unless, subject to certain limitations described in the RCC, during the 180 days prior to the date of redemption, defeasance or purchase, we have received a specified amount of proceeds from the sale of qualifying securities.
CY2011	us-gaap	Cash Flow Hedge Gain Loss Reclassified To Interest Expense Net CashFlowHedgeGainLossReclassifiedToInterestExpenseNet	200000	USD
CY2009	us-gaap	Cash Flow Hedge Gain Loss Reclassified To Interest Expense Net CashFlowHedgeGainLossReclassifiedToInterestExpenseNet	400000	USD
CY2010	us-gaap	Cash Flow Hedge Gain Loss Reclassified To Interest Expense Net CashFlowHedgeGainLossReclassifiedToInterestExpenseNet	400000	USD
CY2011	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	100000	USD
CY2011Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	11900000	USD
CY2010Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	11700000	USD
CY2010Q4	us-gaap	Commercial Paper CommercialPaper	657900000	USD
CY2011Q4	us-gaap	Commercial Paper CommercialPaper	669900000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2010Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	325000000	shares
CY2010Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	325000000	shares
CY2010Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	233771194	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	230486804	shares
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	3963300000	USD
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	3802100000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	456900000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	382800000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	526400000	USD
CY2011Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	921300000	USD
CY2010Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	1569900000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	144900000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-166700000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	28100000	USD
CY2011Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	4541400000	USD
CY2011Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	5179900000	USD
CY2010Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	4578000000	USD
CY2011	us-gaap	Debt Instrument Interest Rate Terms DebtInstrumentInterestRateTerms	We have the option to defer interest payments on the Junior Notes, from time to time, for one or more periods of up to 10 consecutive years per period. During any period in which we defer interest payments, we may not declare or pay any dividends or distributions on, or redeem, repurchase or acquire, our common stock.
CY2010Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	24500000	USD
CY2011Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	26900000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	434800000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	108600000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	191200000	USD
CY2011	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	430600000	USD
CY2010	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	104900000	USD
CY2009	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	187400000	USD
CY2010Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	805500000	USD
CY2011Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	754500000	USD
CY2009	us-gaap	Deferred Revenue Period Increase Decrease DeferredRevenuePeriodIncreaseDecrease	-8000000	USD
CY2010	us-gaap	Deferred Revenue Period Increase Decrease DeferredRevenuePeriodIncreaseDecrease	-34600000	USD
CY2011	us-gaap	Deferred Revenue Period Increase Decrease DeferredRevenuePeriodIncreaseDecrease	-54400000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	279700000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	305900000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	900000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	21600000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	-1696100000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	-1154800000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	645900000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	872200000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	47800000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	71700000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	800500000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	598100000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	303500000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2546700000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1799800000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	50100000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	46900000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	1752900000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2496600000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1346800000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2020700000	USD
CY2009	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0825
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation	-26800000	USD
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents	-3100000	USD
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	31900000	USD
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	3800000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	1222500000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	1329400000	USD
CY2011	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	336400000	USD
CY2009	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	346900000	USD
CY2010	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	317400000	USD
CY2010	us-gaap	Depreciation And Amortization DepreciationAndAmortization	305600000	USD
CY2011	us-gaap	Depreciation And Amortization DepreciationAndAmortization	330200000	USD
CY2009	us-gaap	Depreciation And Amortization DepreciationAndAmortization	343000000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	330200000	USD
CY2009	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	343000000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	305600000	USD
CY2010Q4	us-gaap	Derivative Assets DerivativeAssets	15700000	USD
CY2011Q4	us-gaap	Derivative Assets DerivativeAssets	20600000	USD
CY2010Q4	us-gaap	Derivative Financial Instruments Liabilities Fair Value Disclosure DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure	11600000	USD
CY2011Q4	us-gaap	Derivative Financial Instruments Liabilities Fair Value Disclosure DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure	9200000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Recognized In Income Net DerivativeInstrumentsGainLossRecognizedInIncomeNet	-25600000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Recognized In Income Net DerivativeInstrumentsGainLossRecognizedInIncomeNet	-14000000	USD
CY2011	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;">RECENT ACCOUNTING PRONOUNCEMENTS</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-style:italic;font-weight:bold;">Presentation of Comprehensive Income:   </font><font style="font-family:Arial;font-size:10pt;">In June 2011, the Financial Accounting Standards Board (FASB) issued guidance on the presentation of comprehensive income. This guidance eliminates the option of presenting components of other comprehensive income as part of the statement of changes in stockholders' equity. The guidance gives entities the option to present the total of comprehensive income, the components of net income and the components of other comprehensive income in either a single continuous statement of comprehensive income or in two separate but consecutive statements. In December 2011, the FASB issued an amendment to indefinitely defer one of the requirements contained in its June 2011 final standard. That requirement called for reclassification adjustments from accumulated other comprehensive income to be measured and presented by income statement line item in net income and also in other comprehensive income. This guidance, including the related deferral, is effective for fiscal years and interim periods beginning after December 15, 2011 and must be applied retrospectively. We are currently assessing the effects this guidance may have on our consolidated financial statements.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-style:italic;font-weight:bold;">Fair Value Measurement:   </font><font style="font-family:Arial;font-size:10pt;">In May 2011, the FASB issued guidance amending existing guidance for measuring fair value and for disclosing information about fair value measurements. Under the new guidance, required disclosures are expanded, particularly for fair value measurements that are categorized within Level 3 of the fair value hierarchy, for which quantitative information about the unobservable inputs, the valuation processes used by the entity, and the sensitivity of the measurement to the unobservable inputs will be required. Entities will also be required to disclose the categorization, by level of the fair value hierarchy, of items that are not measured at fair value in the balance sheets but for which the fair value is required to be disclosed. This guidance is effective for fiscal years and interim periods beginning after December 15, 2011 and must be applied prospectively. We are currently assessing the effects this guidance may have on our consolidated financial statements.</font></div></div>
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	187000000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	242000000	USD
CY2009	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	157800000	USD
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.95
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.26
CY2009	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.64
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.93
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.24
CY2009	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.62
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2009	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2011	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	62500000	USD
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.018
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.016
CY2009	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.014
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2009	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.002
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.005
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.005
CY2009	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.006
CY2009	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	-0.012
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	-0.010
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	-0.011
CY2010Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	88300000	USD
CY2011Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	105900000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	11400000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	14100000	USD
CY2009	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	10300000	USD
CY2010Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	379100000	USD
CY2011Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	382000000	USD
CY2010Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	91500000	USD
CY2011Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	98700000	USD
CY2010Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	182400000	USD
CY2011Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	169200000	USD
CY2011Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.500
CY2011Q4	us-gaap	Equity Method Investment Underlying Equity In Net Assets EquityMethodInvestmentUnderlyingEquityInNetAssets	3500000000	USD
CY2009	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	1700000	USD
CY2010	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	4400000	USD
CY2011	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	2400000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.06
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.03
CY2009	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-11700000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.06
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.03
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1000000	USD
CY2009	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	34600000	USD
CY2010	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	25900000	USD
CY2011	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	25900000	USD
CY2009	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	46200000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	441900000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	441900000	USD
CY2011	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2011Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	0	USD
CY2011Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	2700000	USD
CY2010	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	454400000	USD
CY2009	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	375700000	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	512800000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	776700000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	704300000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	591200000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.20
CY2009	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.61
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.94
CY2009	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.59
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.92
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.18
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	2100000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	13400000	USD
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	6700000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2011	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	27000000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	44100000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	61600000	USD
CY2009	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	58900000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	59900000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	60100000	USD
CY2009	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	59100000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3600000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	4200000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3800000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	8700000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	7100000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	7200000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-109100000	USD
CY2009	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-27900000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	263900000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	249900000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	215500000	USD
CY2010	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	12600000	USD
CY2009	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	8300000	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	12600000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	246500000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	271800000	USD
CY2009	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	206900000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1700000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2400000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1600000	USD
CY2009	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	31800000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	35800000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	40100000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	166700000	USD
CY2011Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	155100000	USD
CY2010Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	83700000	USD
CY2009	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-119100000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	21300000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	11800000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-30100000	USD
CY2009	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-111100000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	50400000	USD
CY2009	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	43400000	USD
CY2011	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-87400000	USD
CY2010	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-42700000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2900000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-14100000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	20500000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-24800000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	29600000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-40000000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	22000000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	37200000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-186200000	USD
CY2009	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-192000000	USD
CY2011	us-gaap	Interest Expense InterestExpense	235800000	USD
CY2010	us-gaap	Interest Expense InterestExpense	206400000	USD
CY2009	us-gaap	Interest Expense InterestExpense	156700000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	234000000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	198000000	USD
CY2009	us-gaap	Interest Paid Net InterestPaidNet	152300000	USD
CY2011Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	114100000	USD
CY2010Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	105200000	USD
CY2011Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	349700000	USD
CY2010Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	330500000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	13059800000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	13862100000	USD
CY2010Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1721100000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1364500000	USD
CY2010Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	3932000000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	4614300000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	32600000	USD
CY2010Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	473400000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	3375500000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	669900000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	1200000000	USD
CY2011	us-gaap	Long Term Contract For Purchase Of Electric Power Amount Of Long Term Debt Or Lease Obligation Outstanding LongTermContractForPurchaseOfElectricPowerAmountOfLongTermDebtOrLeaseObligationOutstanding	309500000	USD
CY2010	us-gaap	Long Term Contract For Purchase Of Electric Power Annual Minimum Debt Service Payment Required LongTermContractForPurchaseOfElectricPowerAnnualMinimumDebtServicePaymentRequired	64200000	USD
CY2011	us-gaap	Long Term Contract For Purchase Of Electric Power Annual Minimum Debt Service Payment Required LongTermContractForPurchaseOfElectricPowerAnnualMinimumDebtServicePaymentRequired	65900000	USD
CY2009	us-gaap	Long Term Contract For Purchase Of Electric Power Annual Minimum Debt Service Payment Required LongTermContractForPurchaseOfElectricPowerAnnualMinimumDebtServicePaymentRequired	62200000	USD
CY2010Q4	us-gaap	Long Term Debt LongTermDebt	4288000000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	4541400000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	20300000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	27400000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	399500000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	322400000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	396300000	USD
CY2010Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3932000000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4614300000	USD
CY2011Q4	us-gaap	Long Term Investments LongTermInvestments	393300000	USD
CY2010Q4	us-gaap	Long Term Investments LongTermInvestments	376300000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-172600000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-111300000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	95700000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-633500000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-892500000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-736100000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	628900000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	993400000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	810400000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	456500000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	526200000	USD
CY2009	us-gaap	Net Income Loss NetIncomeLoss	382400000	USD
CY2009	us-gaap	Operating Income Loss OperatingIncomeLoss	660300000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	810400000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	887300000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	63400000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	16300000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3700000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	4000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	3900000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	6500000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	29000000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	87100000	USD
CY2010Q4	us-gaap	Other Assets Current OtherAssetsCurrent	85000000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	201600000	USD
CY2010Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	218900000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	400000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	200000	USD
CY2009	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	400000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	222700000	USD
CY2010Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	353200000	USD
CY2011Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	867100000	USD
CY2009	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	-230700000	USD
CY2011	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	0	USD
CY2010	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	-198400000	USD
CY2010Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	186100000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	230400000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	314300000	USD
CY2010Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	376900000	USD
CY2010Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	45800000	USD
CY2011Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	43600000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	62700000	USD
CY2009	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	28500000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	40200000	USD
CY2009	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	104400000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	85000000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	59400000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	193900000	USD
CY2009	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	29600000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	156600000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	242000000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	187000000	USD
CY2009	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	157800000	USD
CY2011	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	6600000	USD
CY2009	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	25900000	USD
CY2010	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	5200000	USD
CY2011	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	830800000	USD
CY2010	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	798200000	USD
CY2009	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	814600000	USD
CY2009	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	289300000	USD
CY2011	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	277400000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	0	USD
CY2011Q4	us-gaap	Postemployment Benefits Liability Current And Noncurrent PostemploymentBenefitsLiabilityCurrentAndNoncurrent	15300000	USD
CY2011Q4	us-gaap	Preferred Stock Value PreferredStockValue	30400000	USD
CY2010Q4	us-gaap	Preferred Stock Value PreferredStockValue	30400000	USD
CY2011Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	140300000	USD
CY2010Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	125600000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	530000000	USD
CY2009	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	261500000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	720000000	USD
CY2009	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	2900000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	9000000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	4800000	USD
CY2010	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-167200000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	12000000	USD
CY2009	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	222800000	USD
CY2010	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	68700000	USD
CY2011	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	41500000	USD
CY2009	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	16800000	USD
CY2009	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	17000000	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	90900000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	54400000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	526200000	USD
CY2009	us-gaap	Profit Loss ProfitLoss	382400000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	456500000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10160400000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	9601500000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	12977700000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	11590800000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	59400000	USD
CY2009	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	16000000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	32500000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	24700000	USD
CY2009	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	6700000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	13500000	USD
CY2011	us-gaap	Public Utilities Disclosure Of Rate Matters PublicUtilitiesDisclosureOfRateMatters	Our retail electric rates in Wisconsin are established by the PSCW and include base amounts for fuel and purchased power costs. Beginning in January 2011, the electric fuel rules in Wisconsin allow us to defer, for subsequent rate recovery or refund, any under-collection or over-collection of fuel costs that are outside of the symmetrical fuel cost tolerance, which the PSCW set at plus or minus 2% of the approved fuel cost plan. The deferred amounts are subject to an excess revenues test. Our retail gas rates include monthly adjustments which permit the recovery or refund of actual purchased gas costs. We defer any difference between actual gas costs incurred (adjusted for a sharing mechanism) and costs recovered through rates as a current asset or liability. The deferred balance is returned to or recovered from customers at intervals throughout the year. For information regarding revenue recognition for We Power, see Note E.
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	7966800000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	9179900000	USD
CY2011	us-gaap	Recognition Of Deferred Revenue RecognitionOfDeferredRevenue	3500000	USD
CY2009	us-gaap	Recognition Of Deferred Revenue RecognitionOfDeferredRevenue	201700000	USD
CY2010	us-gaap	Recognition Of Deferred Revenue RecognitionOfDeferredRevenue	100800000	USD
CY2011Q4	us-gaap	Regulatory Assets RegulatoryAssets	1265700000	USD
CY2010Q4	us-gaap	Regulatory Assets RegulatoryAssets	1144500000	USD
CY2010Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1090100000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1238700000	USD
CY2011Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	915900000	USD
CY2010Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	899100000	USD
CY2010Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	883800000	USD
CY2011Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	902000000	USD
CY2011	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	31300000	USD
CY2010	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	30200000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	466600000	USD
CY2009	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	221100000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	291700000	USD
CY2010	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	281500000	USD
CY2010Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	8300000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	45500000	USD
CY2011	us-gaap	Sale Of Stock Percentage Of Ownership Before Transaction SaleOfStockPercentageOfOwnershipBeforeTransaction	0.25
CY2010	us-gaap	Sales Revenue Energy Services SalesRevenueEnergyServices	4202500000	USD
CY2009	us-gaap	Sales Revenue Energy Services SalesRevenueEnergyServices	4100900000	USD
CY2011	us-gaap	Sales Revenue Energy Services SalesRevenueEnergyServices	4486400000	USD
CY2011	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	193900000	USD
CY2010	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	156600000	USD
CY2009	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	29600000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	3963300000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	3802100000	USD
CY2011	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	4486400000	USD
CY2009	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	4100900000	USD
CY2010	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	4202500000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Expiration Dating ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardExpirationDating	no later than 10 years from grant date
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.039
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.030
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.037
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	6.2
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.5
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.9
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.190
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.259
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.203
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	7534980.0	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	21.14
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	12000000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	36100000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	62100000	USD
CY2012Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	938770	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.17
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	4.01
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.36
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	10638750.0	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	21.65
CY2009	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	17000000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	54400000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	90900000	USD
CY2010	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1327500000	USD
CY2009	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1246100000	USD
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	236700000	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	235900000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	235400000	shares
CY2008Q4	us-gaap	Stockholders Equity StockholdersEquity	3336900000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	3566900000	USD
CY2011	us-gaap	Tax Benefit From Stock Options Exercised TaxBenefitFromStockOptionsExercised	14300000	USD
CY2009	us-gaap	Tax Benefit From Stock Options Exercised TaxBenefitFromStockOptionsExercised	4800000	USD
CY2010	us-gaap	Tax Benefit From Stock Options Exercised TaxBenefitFromStockOptionsExercised	24100000	USD
CY2011Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	25000000	USD
CY2011Q4	us-gaap	Tax Credit Carryforward Deferred Tax Asset TaxCreditCarryforwardDeferredTaxAsset	25000000	USD
CY2010	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	29500000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11100000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	35400000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2500000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	13900000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	14300000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	2000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	300000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	300000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	800000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	10400000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	2000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	8200000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	4100000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	700000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	2000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2500000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	300000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2300000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	100000	USD
CY2011	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	3599100000	USD
CY2010	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	3590500000	USD
CY2009	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	3671300000	USD
CY2011	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1256800000	USD
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	232600000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	233800000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	233800000	shares
CY2011	wec	Ability To Declare Common Dividends Limited To Percentage Of Net Income AbilityToDeclareCommonDividendsLimitedToPercentageOfNetIncome	limited to 75% or 50%
CY2011Q4	wec	Accrued Revenues AccruedRevenues	252700000	USD
CY2010Q4	wec	Accrued Revenues AccruedRevenues	280300000	USD
CY2011	wec	Allowance For Funds Used During Construction Biomass Project Percent AllowanceForFundsUsedDuringConstructionBiomassProjectPercent	1.00
CY2011	wec	Capital Lease Agreement With Vie Remaining Term In Years CapitalLeaseAgreementWithVieRemainingTermInYears	11
CY2011	wec	Capital Lease Obligation At End Of Life Of Contract CapitalLeaseObligationAtEndOfLifeOfContract	0	USD
CY2010Q4	wec	Deferred Tax Assets Other Current DeferredTaxAssetsOtherCurrent	33500000	USD
CY2011Q4	wec	Deferred Tax Assets Other Non Current DeferredTaxAssetsOtherNonCurrent	34000000	USD
CY2010	wec	Cost Of Gas Sold CostOfGasSold	751500000	USD
CY2009	wec	Cost Of Gas Sold CostOfGasSold	912000000	USD
CY2011	wec	Cost Of Gas Sold CostOfGasSold	728700000	USD
CY2011Q4	wec	Current Pension Plan Asset Allocation In Equity Investments CurrentPensionPlanAssetAllocationInEquityInvestments	0.450
CY2011Q4	wec	Current Pension Plan Asset Allocation In Fixed Income Investments CurrentPensionPlanAssetAllocationInFixedIncomeInvestments	0.550
CY2011	wec	Current Rates Amounts As Percent Of Capital Expenditures CurrentRatesAmountsAsPercentOfCapitalExpenditures	0.14
CY2011Q4	wec	Deferred Tax Assets Construction Advances Non Current DeferredTaxAssetsConstructionAdvancesNonCurrent	25400000	USD
CY2010Q4	wec	Deferred Tax Assets Construction Advances Non Current DeferredTaxAssetsConstructionAdvancesNonCurrent	118300000	USD
CY2011Q4	wec	Deferred Tax Assets Emission Allowances Non Current DeferredTaxAssetsEmissionAllowancesNonCurrent	1000000	USD
CY2010Q4	wec	Deferred Tax Assets Emission Allowances Non Current DeferredTaxAssetsEmissionAllowancesNonCurrent	2600000	USD
CY2010Q4	wec	Deferred Tax Assets Employee Benefits And Compensation Current DeferredTaxAssetsEmployeeBenefitsAndCompensationCurrent	14300000	USD
CY2011Q4	wec	Deferred Tax Assets Employee Benefits And Compensation Current DeferredTaxAssetsEmployeeBenefitsAndCompensationCurrent	14600000	USD
CY2011Q4	wec	Deferred Tax Assets Employee Benefits And Compensation Non Current DeferredTaxAssetsEmployeeBenefitsAndCompensationNonCurrent	103600000	USD
CY2010Q4	wec	Deferred Tax Assets Employee Benefits And Compensation Non Current DeferredTaxAssetsEmployeeBenefitsAndCompensationNonCurrent	110200000	USD
CY2010Q4	wec	Deferred Tax Assets Future Federal Tax Benefits DeferredTaxAssetsFutureFederalTaxBenefits	0	USD
CY2011Q4	wec	Deferred Tax Assets Future Federal Tax Benefits DeferredTaxAssetsFutureFederalTaxBenefits	328500000	USD
CY2011Q4	wec	Deferred Tax Assets Other Current DeferredTaxAssetsOtherCurrent	57100000	USD
CY2010Q4	wec	Deferred Tax Assets Other Non Current DeferredTaxAssetsOtherNonCurrent	30800000	USD
CY2011Q4	wec	Deferred Tax Assets Uncertainty In Income Taxes DeferredTaxAssetsUncertaintyInIncomeTaxes	11000000	USD
CY2010Q4	wec	Deferred Tax Assets Uncertainty In Income Taxes DeferredTaxAssetsUncertaintyInIncomeTaxes	16900000	USD
CY2010Q4	wec	Deferred Tax Liabilities Deferred Transmission Costs Non Current DeferredTaxLiabilitiesDeferredTransmissionCostsNonCurrent	53100000	USD
CY2011Q4	wec	Deferred Tax Liabilities Deferred Transmission Costs Non Current DeferredTaxLiabilitiesDeferredTransmissionCostsNonCurrent	47400000	USD
CY2010Q4	wec	Deferred Tax Liabilities Employee Benefits And Compensation Non Current DeferredTaxLiabilitiesEmployeeBenefitsAndCompensationNonCurrent	179500000	USD
CY2011Q4	wec	Deferred Tax Liabilities Employee Benefits And Compensation Non Current DeferredTaxLiabilitiesEmployeeBenefitsAndCompensationNonCurrent	232800000	USD
CY2011Q4	wec	Deferred Tax Liabilities Investment In Transmission Affiliate Non Current DeferredTaxLiabilitiesInvestmentInTransmissionAffiliateNonCurrent	129200000	USD
CY2010Q4	wec	Deferred Tax Liabilities Investment In Transmission Affiliate Non Current DeferredTaxLiabilitiesInvestmentInTransmissionAffiliateNonCurrent	112400000	USD
CY2010Q4	wec	Deferred Tax Liabilities Other Non Current DeferredTaxLiabilitiesOtherNonCurrent	61100000	USD
CY2011Q4	wec	Deferred Tax Liabilities Other Non Current DeferredTaxLiabilitiesOtherNonCurrent	66500000	USD
CY2011Q4	wec	Deferred Tax Liabilities Prepaid Items Current DeferredTaxLiabilitiesPrepaidItemsCurrent	50100000	USD
CY2010Q4	wec	Deferred Tax Liabilities Prepaid Items Current DeferredTaxLiabilitiesPrepaidItemsCurrent	46900000	USD
CY2009	wec	Depreciation Percentage Of Average Depreciable Utility Plant DepreciationPercentageOfAverageDepreciableUtilityPlant	0.037
CY2011	wec	Depreciation Percentage Of Average Depreciable Utility Plant DepreciationPercentageOfAverageDepreciableUtilityPlant	0.028
CY2010	wec	Depreciation Percentage Of Average Depreciable Utility Plant DepreciationPercentageOfAverageDepreciableUtilityPlant	0.028
CY2009	wec	Distributions From Transmission Affiliate DistributionsFromTransmissionAffiliate	46600000	USD
CY2011	wec	Distributions From Transmission Affiliate DistributionsFromTransmissionAffiliate	49700000	USD
CY2010	wec	Distributions From Transmission Affiliate DistributionsFromTransmissionAffiliate	49300000	USD
CY2009	wec	Effective Income Tax Rate Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity EffectiveIncomeTaxRateReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	-0.009
CY2010	wec	Effective Income Tax Rate Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity EffectiveIncomeTaxRateReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	-0.016
CY2011	wec	Effective Income Tax Rate Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity EffectiveIncomeTaxRateReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	-0.027
CY2011	wec	Effective Income Tax Rate Reconciliation State And Local Income Taxes Net Of Federal Tax Benefit EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesNetOfFederalTaxBenefit	0.052
CY2010	wec	Effective Income Tax Rate Reconciliation State And Local Income Taxes Net Of Federal Tax Benefit EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesNetOfFederalTaxBenefit	0.051
CY2009	wec	Effective Income Tax Rate Reconciliation State And Local Income Taxes Net Of Federal Tax Benefit EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesNetOfFederalTaxBenefit	0.054
CY2011	wec	Income Tax Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity IncomeTaxReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	20800000	USD
CY2011	wec	Exercise Price Of Stock Option On Grant Date ExercisePriceOfStockOptionOnGrantDate	no less than 100% of the common stock's fair market value
CY2010Q4	wec	Fair Value Assets Measured On Recurring Basis Total Assets FairValueAssetsMeasuredOnRecurringBasisTotalAssets	24000000	USD
CY2011Q4	wec	Fair Value Assets Measured On Recurring Basis Total Assets FairValueAssetsMeasuredOnRecurringBasisTotalAssets	66100000	USD
CY2010Q4	wec	Fair Value Liabilities Measured On Recurring Basis Total Liabilities FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities	11600000	USD
CY2011Q4	wec	Fair Value Liabilities Measured On Recurring Basis Total Liabilities FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities	9200000	USD
CY2009	wec	Fuel And Purchased Power FuelAndPurchasedPower	1059700000	USD
CY2010	wec	Fuel And Purchased Power FuelAndPurchasedPower	1099900000	USD
CY2011	wec	Fuel And Purchased Power FuelAndPurchasedPower	1169700000	USD
CY2011	wec	Fuel Cost Tolerance Range Set By Regulators Percent FuelCostToleranceRangeSetByRegulatorsPercent	0.02
CY2011Q4	wec	Guarantee Obligations Current Outstanding GuaranteeObligationsCurrentOutstanding	100000	USD
CY2011	wec	Health Care Cost Trend Rate Post Specified Age HealthCareCostTrendRatePostSpecifiedAge	65
CY2011	wec	Health Care Cost Trend Rate Up To Specified Age HealthCareCostTrendRateUpToSpecifiedAge	65
CY2010	wec	Income Tax Expense Benefit Effective Tax Rate IncomeTaxExpenseBenefitEffectiveTaxRate	0.355
CY2011	wec	Income Tax Expense Benefit Effective Tax Rate IncomeTaxExpenseBenefitEffectiveTaxRate	0.340
CY2009	wec	Income Tax Expense Benefit Effective Tax Rate IncomeTaxExpenseBenefitEffectiveTaxRate	0.365
CY2009	wec	Income Tax Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity IncomeTaxReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	5600000	USD
CY2010	wec	Income Tax Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity IncomeTaxReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	11400000	USD
CY2009	wec	Increase In Regulatory Asset Due To Minimum Lease Payment IncreaseInRegulatoryAssetDueToMinimumLeasePayment	78500000	USD
CY2011	wec	Matching Contributions Under Savings Plans MatchingContributionsUnderSavingsPlans	14100000	USD
CY2009	wec	Matching Contributions Under Savings Plans MatchingContributionsUnderSavingsPlans	14100000	USD
CY2010	wec	Matching Contributions Under Savings Plans MatchingContributionsUnderSavingsPlans	13800000	USD
CY2011	wec	Maximum Duration To Recover Outstanding Regulatory Assets MaximumDurationToRecoverOutstandingRegulatoryAssets	20
CY2011	wec	Maximum Percentage Award Based On Performance Unit MaximumPercentageAwardBasedOnPerformanceUnit	1.75
CY2011	wec	Maximum Regulatory Current Assets And Current Liabilities Amortization Period MaximumRegulatoryCurrentAssetsAndCurrentLiabilitiesAmortizationPeriod	1
CY2011	wec	Minimum Percentage Award Based On Performance Unit MinimumPercentageAwardBasedOnPerformanceUnit	0.00
CY2010Q4	wec	Net Regulatory Assets Not Earning Return NetRegulatoryAssetsNotEarningReturn	16500000	USD
CY2011Q4	wec	Net Regulatory Assets Not Earning Return NetRegulatoryAssetsNotEarningReturn	11000000	USD
CY2011Q4	wec	Net Regulatory Assets Not Earning Return Period Of Recovery NetRegulatoryAssetsNotEarningReturnPeriodOfRecovery	one to five years
CY2011	wec	New Generating Units Build NewGeneratingUnitsBuild	4
CY2011Q4	wec	Number Of Agreements With Vies NumberOfAgreementsWithVies	2
CY2011Q4	wec	Number Of Operating Leases With Vies NumberOfOperatingLeasesWithVies	1
CY2011	wec	Operating Lease Agreements With Vie Remaining Term In Years OperatingLeaseAgreementsWithVieRemainingTermInYears	1.5	Years
CY2009	wec	Other Income And Deductions Net Other OtherIncomeAndDeductionsNetOther	10800000	USD
CY2011	wec	Other Income And Deductions Net Other OtherIncomeAndDeductionsNetOther	900000	USD
CY2010	wec	Other Income And Deductions Net Other OtherIncomeAndDeductionsNetOther	3300000	USD
CY2011Q4	wec	Other Post Retirement Employee Benefits Asset Allocation In Equity Investments OtherPostRetirementEmployeeBenefitsAssetAllocationInEquityInvestments	0.600
CY2011Q4	wec	Other Post Retirement Employee Benefits Asset Allocation In Fixed Income Investments OtherPostRetirementEmployeeBenefitsAssetAllocationInFixedIncomeInvestments	0.400
CY2011Q4	wec	Percentage Of Equity Method Investment Exceeding Consolidated Net Assets PercentageOfEquityMethodInvestmentExceedingConsolidatedNetAssets	0.250
CY2011	wec	Power Capacity Under Capital Lease PowerCapacityUnderCapitalLease	236
CY2011	wec	Preferred Interest Rate PreferredInterestRate	0.0360
CY2011	wec	Proceeds From Sale Of Interest In Unit ProceedsFromSaleOfInterestInUnit	38000000	USD
CY2009	wec	Property And Revenue Taxes PropertyAndRevenueTaxes	110500000	USD
CY2011	wec	Property And Revenue Taxes PropertyAndRevenueTaxes	113700000	USD
CY2010	wec	Property And Revenue Taxes PropertyAndRevenueTaxes	106000000	USD
CY2010Q4	wec	Property Related Deferred Tax Assets Non Current PropertyRelatedDeferredTaxAssetsNonCurrent	30300000	USD
CY2011Q4	wec	Property Related Deferred Tax Assets Non Current PropertyRelatedDeferredTaxAssetsNonCurrent	28300000	USD
CY2011	wec	Recovery Period Of Specific Regulatory Assets Under Rate Order RecoveryPeriodOfSpecificRegulatoryAssetsUnderRateOrder	8
CY2011	wec	Regulatory Asset Value At End Of Life Of Contract RegulatoryAssetValueAtEndOfLifeOfContract	0	USD
CY2011	wec	Regulatory Current Assets And Liabilities Amortization Period RegulatoryCurrentAssetsAndLiabilitiesAmortizationPeriod	within one year
CY2011	wec	Regulatory Current Liability Amortization Period RegulatoryCurrentLiabilityAmortizationPeriod	within one year
CY2010Q4	wec	Restricted Cash RestrictedCash	8300000	USD
CY2011Q4	wec	Restricted Cash RestrictedCash	45500000	USD
CY2011	wec	Return On Equity After Tax ReturnOnEquityAfterTax	0.127
CY2011	wec	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate	0.020
CY2010	wec	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate	0.020
CY2009	wec	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate	0.020
CY2012Q1	wec	Share Based Compensation Arrangement By Share Based Payment Award Options Grant In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantInPeriodWeightedAverageExercisePrice	34.88
CY2011Q4	wec	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Remaining Contractual Period ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualPeriod	4.5
CY2011Q4	wec	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Period ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualPeriod	5.4
CY2011	wec	Stock Equity To Total Capitalization StockEquityToTotalCapitalization	is less than 25% and 20%
CY2010Q4	wec	Total Capitalization TotalCapitalization	7764500000	USD
CY2011Q4	wec	Total Capitalization TotalCapitalization	8608000000	USD
CY2010Q4	wec	Total Deferred Charges And Other Assets TotalDeferredChargesAndOtherAssets	1750900000	USD
CY2011Q4	wec	Total Deferred Charges And Other Assets TotalDeferredChargesAndOtherAssets	1882200000	USD
CY2011Q4	wec	Total Deferred Credits And Other Liabilities TotalDeferredCreditsAndOtherLiabilities	3889600000	USD
CY2010Q4	wec	Total Deferred Credits And Other Liabilities TotalDeferredCreditsAndOtherLiabilities	3574200000	USD
CY2010	wec	Weighted Average Pre Tax Cost Of Interest WeightedAveragePreTaxCostOfInterest	0.05
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
CY2011	dei	Entity Central Index Key EntityCentralIndexKey	0000783325
CY2012Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	230461537	shares
CY2011	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2011	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2011Q2	dei	Entity Public Float EntityPublicFloat	7300000000	USD
CY2011	dei	Entity Registrant Name EntityRegistrantName	WISCONSIN ENERGY CORP
CY2011	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2011	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0000107815-12-000039-index-headers.html	Edgar Link	pending
0000107815-12-000039-index.html	Edgar Link	pending
0000107815-12-000039.txt	Edgar Link	pending
0000107815-12-000039-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
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wec-20111231.xml	Edgar Link	completed
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wec-20111231_cal.xml	Edgar Link	unprocessable
wec-20111231_def.xml	Edgar Link	unprocessable
wec-20111231_lab.xml	Edgar Link	unprocessable
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wec1231201110-k.htm	Edgar Link	pending
wec12312011ex109.htm	Edgar Link	pending
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wec12312011ex321.htm	Edgar Link	pending
wec12312011ex322.htm	Edgar Link	pending
weclogo.jpg	Edgar Link	pending

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$WEC
WEC ENERGY GROUP, INC. Stock $wec

2011 Form 10-K Financial Statement

#000010781512000039 Filed on February 28, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WEC WEC ENERGY GROUP, INC. Stock $wec

2011 Form 10-K Financial Statement

#000010781512000039 Filed on February 28, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WEC
WEC ENERGY GROUP, INC. Stock $wec