$WEC
WEC ENERGY GROUP, INC. Stock $wec

$wec Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-K Financial Statement

#000010781514000041 Filed on February 27, 2014

Income Statement

Concept	2012 Q4	2011 Q4	2011
Revenue	$1.071B	$1.113B	$4.486B
YoY Change	-3.77%	2.15%	6.76%
Cost Of Revenue	$177.8M	$195.3M	$728.7M
YoY Change	-8.96%	-16.0%	-3.03%
Gross Profit	$893.4M	$917.9M	$3.758B
YoY Change	-2.67%	7.07%	8.89%
Gross Profit Margin	83.4%	82.46%	83.76%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$93.50M	$87.50M	$330.2M
YoY Change	6.86%	9.65%	8.05%
% of Gross Profit	10.47%	9.53%	8.79%
Operating Expenses	$692.0M	$724.9M	$2.870B
YoY Change	-4.54%	5.33%	1.11%
Operating Profit	$201.4M	$193.0M	$887.3M
YoY Change	4.35%	14.13%	9.49%
Interest Expense	-$50.10M	-$42.10M	$235.8M
YoY Change	19.0%	14.09%	14.24%
% of Operating Profit	-24.88%	-21.81%	26.58%
Other Income/Expense, Net	$1.200M	$19.60M	$62.70M
YoY Change	-93.88%	33.33%	55.97%
Pretax Income	$152.5M	$170.5M	$776.7M
YoY Change	-10.56%	-11.89%	10.28%
Income Tax	$53.70M	$56.40M	$263.9M
% Of Pretax Income	35.21%	33.08%	33.98%
Net Earnings	$98.80M	$116.0M	$526.2M
YoY Change	-14.83%	-7.86%	15.27%
Net Earnings / Revenue	9.22%	10.42%	11.73%
Basic Earnings Per Share			$2.26
Diluted Earnings Per Share	$0.43	$0.50	$2.24
COMMON SHARES
Basic Shares Outstanding			232.6M shares
Diluted Shares Outstanding			235.4M shares

Balance Sheet

Concept	2012 Q4	2011 Q4	2011
SHORT-TERM ASSETS
Cash & Short-Term Investments	$36.00M	$14.00M	$14.00M
YoY Change	157.14%	-44.0%	-44.0%
Cash & Equivalents	$35.60M	$14.10M	$14.00M
Short-Term Investments
Other Short-Term Assets	$62.10M	$87.10M	$273.0M
YoY Change	-28.7%	2.47%	24.66%
Inventory	$361.0M	$382.0M	$382.0M
Prepaid Expenses	$145.5M	$140.3M
Receivables	$285.3M	$349.4M	$602.0M
Other Receivables	$0.00	$155.0M	$155.0M
Total Short-Term Assets	$1.273B	$1.426B	$1.426B
YoY Change	-10.77%	7.14%	7.14%
LONG-TERM ASSETS
Property, Plant & Equipment	$10.57B	$10.16B	$10.16B
YoY Change	4.05%	5.82%	5.82%
Goodwill	$441.9M	$441.9M
YoY Change	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$414.0M	$393.0M	$393.0M
YoY Change	5.34%	4.52%	4.52%
Other Assets	$204.2M	$201.6M	$1.440B
YoY Change	1.29%	-7.9%	10.01%
Total Long-Term Assets	$13.01B	$12.44B	$12.44B
YoY Change	4.64%	6.03%	6.03%
TOTAL ASSETS
Total Short-Term Assets	$1.273B	$1.426B	$1.426B
Total Long-Term Assets	$13.01B	$12.44B	$12.44B
Total Assets	$14.29B	$13.86B	$13.86B
YoY Change	3.05%	6.14%	6.14%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$368.4M	$325.7M	$326.0M
YoY Change	13.11%	3.27%	3.49%
Accrued Expenses	$101.0M	$106.0M	$106.0M
YoY Change	-4.72%	20.45%	20.45%
Deferred Revenue
YoY Change
Short-Term Debt	$395.0M	$670.0M	$670.0M
YoY Change	-41.04%	1.82%	1.82%
Long-Term Debt Due	$412.1M	$32.60M	$33.00M
YoY Change	1164.11%	-93.11%	-93.02%
Total Short-Term Liabilities	$1.441B	$1.365B	$1.365B
YoY Change	5.64%	-20.72%	-20.69%
LONG-TERM LIABILITIES
Long-Term Debt	$4.454B	$4.614B	$4.614B
YoY Change	-3.48%	17.35%	17.34%
Other Long-Term Liabilities	$285.2M	$314.3M	$2.194B
YoY Change	-9.26%	-16.61%	-9.3%
Total Long-Term Liabilities	$4.739B	$4.929B	$6.808B
YoY Change	-3.85%	14.38%	7.2%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.441B	$1.365B	$1.365B
Total Long-Term Liabilities	$4.739B	$4.929B	$6.808B
Total Liabilities	$6.180B	$6.293B	$9.868B
YoY Change	-1.79%	4.36%	6.95%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock	$4.135B	$3.963B
YoY Change	4.33%	4.24%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.166B	$3.963B	$3.994B
YoY Change
Total Liabilities & Shareholders Equity	$14.29B	$13.86B	$13.86B
YoY Change	3.05%	6.14%	6.14%

Cashflow Statement

Concept	2012 Q4	2011 Q4	2011
OPERATING ACTIVITIES
Net Income	$98.80M	$116.0M	$526.2M
YoY Change	-14.83%	-7.86%	15.27%
Depreciation, Depletion And Amortization	$93.50M	$87.50M	$330.2M
YoY Change	6.86%	9.65%	8.05%
Cash From Operating Activities	$181.5M	$165.8M	$993.4M
YoY Change	9.47%	5.81%	22.58%
INVESTING ACTIVITIES
Capital Expenditures	$229.5M	$218.6M	$830.8M
YoY Change	4.99%	-13.46%	4.08%
Acquisitions
YoY Change
Other Investing Activities	-$8.700M	-$23.60M	$42.50M
YoY Change	-63.14%	-181.1%	-50.0%
Cash From Investing Activities	-$238.2M	-$242.2M	-$892.5M
YoY Change	-1.65%	8.37%	40.88%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$193.9M
YoY Change			23.82%
Debt Paid & Issued, Net			$466.6M
YoY Change			59.96%
Cash From Financing Activities	79.30M	75.40M	-$111.3M
YoY Change	5.17%	-5.87%	-35.52%
NET CHANGE
Cash From Operating Activities	181.5M	165.8M	$993.4M
Cash From Investing Activities	-238.2M	-242.2M	-$892.5M
Cash From Financing Activities	79.30M	75.40M	-$111.3M
Net Change In Cash	22.60M	-1.000M	-$10.40M
YoY Change	-2360.0%	-107.52%	-341.86%
FREE CASH FLOW
Cash From Operating Activities	$181.5M	$165.8M	$993.4M
Capital Expenditures	$229.5M	$218.6M	$830.8M
Free Cash Flow	-$48.00M	-$52.80M	$162.6M
YoY Change	-9.09%	-44.94%	1232.79%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	368400000	USD
CY2013Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	342600000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	285300000	USD
CY2013Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	406000000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	4036000000	USD
CY2013Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	4257100000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4600000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6200000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5200000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	11900000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	18100000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	22000000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	19000000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	28500000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	58000000	USD
CY2013Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	61000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	55500000	USD
CY2013Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	42300000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	44300000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	2800000	USD
CY2013	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	2400000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	14000000	USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	4400000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	915300000	USD
CY2012Q4	us-gaap	Assets Assets	14285000000	USD
CY2013Q4	us-gaap	Assets Assets	14769400000	USD
CY2011Q4	us-gaap	Assets Assets	13862100000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	1272600000	USD
CY2013Q4	us-gaap	Assets Current AssetsCurrent	1551100000	USD
CY2013Q4	us-gaap	Assets Held For Sale Long Lived AssetsHeldForSaleLongLived	0	USD
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	15700000	USD
CY2013	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	4700000	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	16700000	USD
CY2013Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	104300000	USD
CY2012Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	120000000	USD
CY2013Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	19800000	USD
CY2013Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	84500000	USD
CY2012Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	140300000	USD
CY2013Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	140300000	USD
CY2012Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	53500000	USD
CY2013Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	47800000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	215900000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	41900000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	14700000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	13900000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	45100000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	43500000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	56800000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Executory Costs CapitalLeasesFutureMinimumPaymentsExecutoryCosts	61700000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	49900000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	104300000	USD
CY2013Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	92500000	USD
CY2012Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	86800000	USD
CY2013Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	8626600000	USD
CY2012Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	8619300000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	26000000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	35600000	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
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	21500000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-10400000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-9600000	USD
CY2013Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2012Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	2900000	USD
CY2012Q4	us-gaap	Commercial Paper CommercialPaper	394600000	USD
CY2013Q4	us-gaap	Commercial Paper CommercialPaper	537400000	USD
CY2013Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2013Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	325000000	shares
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	325000000	shares
CY2013Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	225962959	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	229039456	shares
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	4135100000	USD
CY2013Q4	us-gaap	Common Stock Value CommonStockValue	4233000000	USD
CY2012Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	315900000	USD
CY2013Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	149600000	USD
CY2013	us-gaap	Cost Of Domestic Regulated Gas Revenue CostOfDomesticRegulatedGasRevenue	674100000	USD
CY2012	us-gaap	Cost Of Domestic Regulated Gas Revenue CostOfDomesticRegulatedGasRevenue	545800000	USD
CY2011	us-gaap	Cost Of Domestic Regulated Gas Revenue CostOfDomesticRegulatedGasRevenue	728700000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	13100000	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	25200000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-166700000	USD
CY2013Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	4626700000	USD
CY2013Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	4911800000	USD
CY2012Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	5447300000	USD
CY2013	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.
CY2013	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.
CY2013Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	25600000	USD
CY2012Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	27000000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	313800000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	294400000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	434800000	USD
CY2013	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	312700000	USD
CY2012	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	293200000	USD
CY2011	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	430600000	USD
CY2013Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	664200000	USD
CY2012Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	709700000	USD
CY2012	us-gaap	Deferred Revenue Revenue Recognized DeferredRevenueRevenueRecognized	54900000	USD
CY2011	us-gaap	Deferred Revenue Revenue Recognized DeferredRevenueRevenueRecognized	54400000	USD
CY2013	us-gaap	Deferred Revenue Revenue Recognized DeferredRevenueRevenueRecognized	56500000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	250000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	237000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	310000000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	105300000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	-2634000000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	-2117000000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	903500000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	854000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	379500000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	155000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	474500000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	748500000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	352500000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	283600000	USD
CY2012	us-gaap	Deferred Tax Expense From Stock Options Exercised DeferredTaxExpenseFromStockOptionsExercised	0	USD
CY2011	us-gaap	Deferred Tax Expense From Stock Options Exercised DeferredTaxExpenseFromStockOptionsExercised	14300000	USD
CY2013	us-gaap	Deferred Tax Expense From Stock Options Exercised DeferredTaxExpenseFromStockOptionsExercised	17800000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2915200000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3178000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	69500000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	49700000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3108500000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2865500000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2574400000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2339400000	USD
CY2013	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	-22300000	USD
CY2013	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	-2600000	USD
CY2013	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	26400000	USD
CY2013	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	3200000	USD
CY2011	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	336400000	USD
CY2012	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	371700000	USD
CY2013	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	400200000	USD
CY2013	us-gaap	Depreciation And Amortization DepreciationAndAmortization	388100000	USD
CY2012	us-gaap	Depreciation And Amortization DepreciationAndAmortization	364200000	USD
CY2011	us-gaap	Depreciation And Amortization DepreciationAndAmortization	330200000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	364200000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	388100000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	330200000	USD
CY2012Q4	us-gaap	Derivative Assets DerivativeAssets	19200000	USD
CY2013Q4	us-gaap	Derivative Assets DerivativeAssets	11800000	USD
CY2013	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	6900000	USD
CY2012	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-28400000	USD
CY2012Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	1900000	USD
CY2013Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	300000	USD
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	328900000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	242000000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	276300000	USD
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.54
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.37
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.26
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.35
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.51
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.24
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.015
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.000
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.016
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.007
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.000
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.001
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.005
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.001
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	-0.018
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	-0.011
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	-0.019
CY2012Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	100900000	USD
CY2013Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	96900000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7600000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	11400000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8800000	USD
CY2012Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	360700000	USD
CY2013Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	329400000	USD
CY2012Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	73300000	USD
CY2013Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	77800000	USD
CY2012Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	165500000	USD
CY2013Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	117700000	USD
CY2013Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.50
CY2013Q4	us-gaap	Equity Method Investment Underlying Equity In Net Assets EquityMethodInvestmentUnderlyingEquityInNetAssets	3600000000	USD
CY2013Q4	us-gaap	Goodwill Goodwill	441900000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	441900000	USD
CY2013	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2013Q4	us-gaap	Grants Receivable Current GrantsReceivableCurrent	82600000	USD
CY2013	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	577400000	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	512800000	USD
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	546300000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	852600000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	776700000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.37
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.20
CY2013	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.54
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.35
CY2013	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.51
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.18
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	13400000	USD
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.06
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.06
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	65500000	USD
CY2013	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	68400000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	61600000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	263900000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	306300000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	337900000	USD
CY2012	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	12600000	USD
CY2013	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	0	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	12600000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	271800000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	320300000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	298400000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1700000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	200000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	6600000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	49000000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	40100000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	43300000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	4200000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	1100000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	1200000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	16700000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	8700000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	15900000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	11800000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-14800000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	43800000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-30100000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-38300000	USD
CY2013	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	162900000	USD
CY2012	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	116900000	USD
CY2011	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-87400000	USD
CY2013	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	36600000	USD
CY2013	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-31300000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2900000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-21300000	USD
CY2013	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	-8700000	USD
CY2012	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	9200000	USD
CY2011	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	25900000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-12100000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2800000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	20500000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	164000000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-49200000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	23500000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	44100000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	7200000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-14900000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	37200000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-42800000	USD
CY2013	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-2700000	USD
CY2011	us-gaap	Interest Expense InterestExpense	235800000	USD
CY2013	us-gaap	Interest Expense InterestExpense	252100000	USD
CY2012	us-gaap	Interest Expense InterestExpense	248200000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	234000000	USD
CY2013	us-gaap	Interest Paid Net InterestPaidNet	250400000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	241200000	USD
CY2013Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	133900000	USD
CY2012Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	121900000	USD
CY2012Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	378300000	USD
CY2013Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	402700000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	14285000000	USD
CY2013Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	14769400000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1441400000	USD
CY2013Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1496400000	USD
CY2013Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	537400000	USD
CY2013Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	1200000000	USD
CY2013	us-gaap	Long Term Contract For Purchase Of Electric Power Amount Of Long Term Debt Or Lease Obligation Outstanding LongTermContractForPurchaseOfElectricPowerAmountOfLongTermDebtOrLeaseObligationOutstanding	215900000	USD
CY2012	us-gaap	Long Term Contract For Purchase Of Electric Power Annual Minimum Debt Service Payment Required LongTermContractForPurchaseOfElectricPowerAnnualMinimumDebtServicePaymentRequired	45800000	USD
CY2013	us-gaap	Long Term Contract For Purchase Of Electric Power Annual Minimum Debt Service Payment Required LongTermContractForPurchaseOfElectricPowerAnnualMinimumDebtServicePaymentRequired	50300000	USD
CY2011	us-gaap	Long Term Contract For Purchase Of Electric Power Annual Minimum Debt Service Payment Required LongTermContractForPurchaseOfElectricPowerAnnualMinimumDebtServicePaymentRequired	65900000	USD
CY2013	us-gaap	Long Term Contract For Purchase Of Electric Power Date Of Contract Expiration LongTermContractForPurchaseOfElectricPowerDateOfContractExpiration	2022-12-31
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	4772900000	USD
CY2013Q4	us-gaap	Long Term Debt LongTermDebt	4626700000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	4453800000	USD
CY2013Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	4363200000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	412100000	USD
CY2013Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	342200000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	3566800000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	322400000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	281100000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	29500000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	27400000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	399500000	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4453800000	USD
CY2013Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4363200000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	165400000	USD
CY2013Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	177300000	USD
CY2013Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	295900000	USD
CY2013Q4	us-gaap	Long Term Investments LongTermInvestments	438800000	USD
CY2012Q4	us-gaap	Long Term Investments LongTermInvestments	413800000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-111300000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-422800000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-494800000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-729600000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-745800000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-892500000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1173900000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	993400000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1231000000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	577400000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	546300000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	526200000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	1000300000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	887300000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	1080100000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	40500000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	3900000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3200000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	3100000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	3700000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	3900000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	22700000	USD
CY2012Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	1007100000	USD
CY2013Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	810300000	USD
CY2013Q4	us-gaap	Other Assets Current OtherAssetsCurrent	12900000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	62100000	USD
CY2013Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	322500000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	204200000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	285200000	USD
CY2012Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	35500000	USD
CY2013Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	36100000	USD
CY2013	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	18800000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	34800000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	62700000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	20100000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	42500000	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	15300000	USD
CY2012	us-gaap	Payments For Proceeds From Removal Costs PaymentsForProceedsFromRemovalCosts	38300000	USD
CY2011	us-gaap	Payments For Proceeds From Removal Costs PaymentsForProceedsFromRemovalCosts	16900000	USD
CY2013	us-gaap	Payments For Proceeds From Removal Costs PaymentsForProceedsFromRemovalCosts	37800000	USD
CY2013	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	223400000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	153200000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	193900000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	328900000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	276300000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	242000000	USD
CY2013	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	10500000	USD
CY2011	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	6600000	USD
CY2012	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	15700000	USD
CY2013	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	687400000	USD
CY2011	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	830800000	USD
CY2012	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	707000000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	707000000	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	687400000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	830800000	USD
CY2013	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	0	USD
CY2011	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	277400000	USD
CY2012	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	100000000	USD
CY2013Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	173200000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	244000000	USD
CY2012Q4	us-gaap	Postemployment Benefits Liability Current And Noncurrent PostemploymentBenefitsLiabilityCurrentAndNoncurrent	4000000	USD
CY2013Q4	us-gaap	Postemployment Benefits Liability Current And Noncurrent PostemploymentBenefitsLiabilityCurrentAndNoncurrent	4200000	USD
CY2012	us-gaap	Revenue From Grants RevenueFromGrants	0	USD
CY2011	us-gaap	Revenue From Grants RevenueFromGrants	0	USD
CY2013	us-gaap	Revenue From Grants RevenueFromGrants	48000000	USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue	30400000	USD
CY2013Q4	us-gaap	Preferred Stock Value PreferredStockValue	30400000	USD
CY2012Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	145500000	USD
CY2013Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	145700000	USD
CY2013	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	39600000	USD
CY2012	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	107000000	USD
CY2011	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	109100000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	251800000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	251000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	720000000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	4800000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	700000	USD
CY2013	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	12400000	USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	142800000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	12000000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-275300000	USD
CY2011	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	41500000	USD
CY2012	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	8700000	USD
CY2013	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	2500000	USD
CY2013	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	48500000	USD
CY2012	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	49800000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	54400000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	546300000	USD
CY2013	us-gaap	Profit Loss ProfitLoss	577400000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	526200000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10906600000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10572200000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	14966300000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	14238800000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	35300000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	59400000	USD
CY2013	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	18300000	USD
CY2013	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	7700000	USD
CY2012	us-gaap	Revenues Revenues	4246400000	USD
CY2013	us-gaap	Revenues Revenues	4519000000	USD
CY2011	us-gaap	Revenues Revenues	4486400000	USD
CY2011	us-gaap	Sale Of Stock Percentage Of Ownership Before Transaction SaleOfStockPercentageOfOwnershipBeforeTransaction	0.25
CY2013	us-gaap	Sales Revenue Energy Services SalesRevenueEnergyServices	4519000000	USD
CY2011	us-gaap	Sales Revenue Energy Services SalesRevenueEnergyServices	4486400000	USD
CY2012	us-gaap	Sales Revenue Energy Services SalesRevenueEnergyServices	4246400000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	24700000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	14700000	USD
CY2013	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. 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 under-collected 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.
CY2011	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.028
CY2013	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.029
CY2012	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.029
CY2013Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	10709200000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	10202800000	USD
CY2013	us-gaap	Reclassifications Reclassifications	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:10pt;font-style:italic;font-weight:bold;">Reclassifications and Adjustments:</font><font style="font-family:inherit;font-size:11pt;">  </font><font style="font-family:Arial;font-size:10pt;">As of </font><font style="font-family:Arial;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2013</font><font style="font-family:Arial;font-size:10pt;">, we have presented the tax effect of net operating loss carryforwards within current deferred tax assets, net on the consolidated balance sheets. As of </font><font style="font-family:Arial;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:Arial;font-size:10pt;">, </font><font style="font-family:Arial;font-size:10pt;">$59.0 million</font><font style="font-family:Arial;font-size:10pt;"> representing the tax effect of net operating loss carryforwards were included in income taxes receivable, which is a line item that has now been condensed within other current assets on the consolidated balance sheets. This </font><font style="font-family:Arial;font-size:10pt;">$59.0 million</font><font style="font-family:Arial;font-size:10pt;"> amount has been adjusted in the consolidated balance sheets as of </font><font style="font-family:Arial;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:Arial;font-size:10pt;"> to conform to the </font><font style="font-family:Arial;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2013</font><font style="font-family:Arial;font-size:10pt;"> presentation, and conforming changes have been made in the consolidated statements of cash flows and in the notes to the consolidated financial statements. For additional information related to our deferred tax assets, see Note G. </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%;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">In addition, we have adjusted the presentation of regulatory assets and liabilities to present amounts as noncurrent assets and liabilities on the consolidated balance sheets. Prior period amounts recorded within other current assets and liabilities have been reclassified to conform to the current presentation. For additional information related to regulatory assets and liabilities, see Note C.</font></div></div>
CY2013Q4	us-gaap	Regulatory Assets RegulatoryAssets	1108500000	USD
CY2012Q4	us-gaap	Regulatory Assets RegulatoryAssets	1380300000	USD
CY2013Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1108500000	USD
CY2012Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1380300000	USD
CY2013Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	879100000	USD
CY2012Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	868300000	USD
CY2013Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	879100000	USD
CY2012Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	868400000	USD
CY2013Q4	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	10100000	USD
CY2013	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	33700000	USD
CY2012	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	32500000	USD
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	397200000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	466600000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	20300000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	2700000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.037
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.039
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.039
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.180
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.190
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.190
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	5708920	shares
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	23.16
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	44500000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	36100000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	47500000	USD
CY2014Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	899500	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
CY2012	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11100000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11300000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.34
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.45
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	8089710	shares
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	26.84
CY2014Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	41.03
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y11M
CY2013	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y11M
CY2011	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y6M
CY2013	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2	P4Y1M
CY2013	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P5Y5M
CY2013	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	48500000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	54400000	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	49800000	USD
CY2011	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	6200000	shares
CY2013	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	5400000	shares
CY2012	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	4300000	shares
CY2013	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	223400000	USD
CY2012	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	153200000	USD
CY2011	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	193900000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	3963300000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	4233000000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	3802100000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	4135100000	USD
CY2013Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	58600000	USD
CY2012Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	41200000	USD
CY2013Q4	us-gaap	Tax Credit Carryforward Deferred Tax Asset TaxCreditCarryforwardDeferredTaxAsset	58600000	USD
CY2012Q4	us-gaap	Tax Credit Carryforward Deferred Tax Asset TaxCreditCarryforwardDeferredTaxAsset	41200000	USD
CY2012	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	121400000	USD
CY2011	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	113700000	USD
CY2013	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	116700000	USD
CY2013	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8400000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	10600000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2900000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2013	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
CY2012	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	10800000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	400000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	300000	USD
CY2013	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	700000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	200000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1000000	USD
CY2013	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	3486900000	USD
CY2011	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	3599100000	USD
CY2012	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	3246100000	USD
CY2013	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1155000000	USD
CY2011	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1256800000	USD
CY2012	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1116100000	USD
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	232800000	shares
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	229700000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	235400000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	232600000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	227600000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	230200000	shares
CY2013	wec	Ability To Declare Common Dividends Limited To Percentage Of Net Income AbilityToDeclareCommonDividendsLimitedToPercentageOfNetIncome	limited to 75% or 50%
CY2013Q4	wec	Accrued Revenues AccruedRevenues	321100000	USD
CY2012Q4	wec	Accrued Revenues AccruedRevenues	278100000	USD
CY2013	wec	Capital Lease Agreements With Vie Remaining Term In Years CapitalLeaseAgreementsWithVIERemainingTermInYears	P9Y
CY2013	wec	Capital Lease Obligation At End Of Life Of Contract CapitalLeaseObligationAtEndOfLifeOfContract	0	USD
CY2013Q4	wec	Capital Leases Future Minimum Payments Due Less Executory Costs CapitalLeasesFutureMinimumPaymentsDueLessExecutoryCosts	154200000	USD
CY2013Q4	wec	Current Pension Plan Asset Allocation In Equity Investments CurrentPensionPlanAssetAllocationInEquityInvestments	0.45
CY2013Q4	wec	Current Pension Plan Asset Allocation In Fixed Income Investments CurrentPensionPlanAssetAllocationInFixedIncomeInvestments	0.55
CY2012Q4	wec	Deferred Tax Assets Employee Benefits And Compensation Non Current DeferredTaxAssetsEmployeeBenefitsAndCompensationNonCurrent	97000000	USD
CY2013Q4	wec	Deferred Tax Assets Employee Benefits And Compensation Non Current DeferredTaxAssetsEmployeeBenefitsAndCompensationNonCurrent	95600000	USD
CY2012Q4	wec	Deferred Tax Assets Future Federal Tax Benefits Current DeferredTaxAssetsFutureFederalTaxBenefitsCurrent	59000000	USD
CY2013Q4	wec	Deferred Tax Assets Future Federal Tax Benefits Current DeferredTaxAssetsFutureFederalTaxBenefitsCurrent	309700000	USD
CY2012Q4	wec	Deferred Tax Assets Future Federal Tax Benefits Non Current DeferredTaxAssetsFutureFederalTaxBenefitsNonCurrent	334700000	USD
CY2013Q4	wec	Deferred Tax Assets Future Federal Tax Benefits Non Current DeferredTaxAssetsFutureFederalTaxBenefitsNonCurrent	32500000	USD
CY2012Q4	wec	Deferred Tax Assets Other Current DeferredTaxAssetsOtherCurrent	81100000	USD
CY2013Q4	wec	Deferred Tax Assets Other Current DeferredTaxAssetsOtherCurrent	56000000	USD
CY2013Q4	wec	Deferred Tax Assets Other Non Current DeferredTaxAssetsOtherNonCurrent	62900000	USD
CY2012Q4	wec	Deferred Tax Assets Other Non Current DeferredTaxAssetsOtherNonCurrent	16300000	USD
CY2013Q4	wec	Deferred Tax Assets Uncertainty In Income Taxes DeferredTaxAssetsUncertaintyInIncomeTaxes	8400000	USD
CY2013	wec	Debt Securities In Cash Equivalents Maximum Period Until Maturity DebtSecuritiesInCashEquivalentsMaximumPeriodUntilMaturity	P0Y3M
CY2012Q4	wec	Deferred Tax Assets Construction Advances Non Current DeferredTaxAssetsConstructionAdvancesNonCurrent	22200000	USD
CY2013Q4	wec	Deferred Tax Assets Construction Advances Non Current DeferredTaxAssetsConstructionAdvancesNonCurrent	18300000	USD
CY2013Q4	wec	Deferred Tax Assets Employee Benefits And Compensation Current DeferredTaxAssetsEmployeeBenefitsAndCompensationCurrent	13800000	USD
CY2012Q4	wec	Deferred Tax Assets Employee Benefits And Compensation Current DeferredTaxAssetsEmployeeBenefitsAndCompensationCurrent	14900000	USD
CY2012Q4	wec	Deferred Tax Assets Uncertainty In Income Taxes DeferredTaxAssetsUncertaintyInIncomeTaxes	10200000	USD
CY2012Q4	wec	Deferred Tax Liabilities Deferred Transmission Costs Non Current DeferredTaxLiabilitiesDeferredTransmissionCostsNonCurrent	45700000	USD
CY2013Q4	wec	Deferred Tax Liabilities Deferred Transmission Costs Non Current DeferredTaxLiabilitiesDeferredTransmissionCostsNonCurrent	50800000	USD
CY2013Q4	wec	Deferred Tax Liabilities Employee Benefits And Compensation Non Current DeferredTaxLiabilitiesEmployeeBenefitsAndCompensationNonCurrent	238500000	USD
CY2012Q4	wec	Deferred Tax Liabilities Employee Benefits And Compensation Non Current DeferredTaxLiabilitiesEmployeeBenefitsAndCompensationNonCurrent	244300000	USD
CY2013Q4	wec	Deferred Tax Liabilities Investment In Transmission Affiliate Non Current DeferredTaxLiabilitiesInvestmentInTransmissionAffiliateNonCurrent	169900000	USD
CY2012Q4	wec	Deferred Tax Liabilities Investment In Transmission Affiliate Non Current DeferredTaxLiabilitiesInvestmentInTransmissionAffiliateNonCurrent	144900000	USD
CY2013Q4	wec	Deferred Tax Liabilities Other Non Current DeferredTaxLiabilitiesOtherNonCurrent	74900000	USD
CY2012Q4	wec	Deferred Tax Liabilities Other Non Current DeferredTaxLiabilitiesOtherNonCurrent	91200000	USD
CY2012Q4	wec	Deferred Tax Liabilities Prepaid Items Current DeferredTaxLiabilitiesPrepaidItemsCurrent	49700000	USD
CY2013Q4	wec	Deferred Tax Liabilities Prepaid Items Current DeferredTaxLiabilitiesPrepaidItemsCurrent	69500000	USD
CY2013	wec	Effective Income Tax Rate Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity EffectiveIncomeTaxRateReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	-0.007
CY2011	wec	Effective Income Tax Rate Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity EffectiveIncomeTaxRateReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	-0.027
CY2012	wec	Effective Income Tax Rate Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity EffectiveIncomeTaxRateReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	-0.014
CY2012	wec	Effective Income Tax Rate Reconciliation State And Local Income Taxes Net Of Federal Tax Benefit EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesNetOfFederalTaxBenefit	0.051
CY2011	wec	Effective Income Tax Rate Reconciliation State And Local Income Taxes Net Of Federal Tax Benefit EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesNetOfFederalTaxBenefit	0.052
CY2013	wec	Effective Income Tax Rate Reconciliation State And Local Income Taxes Net Of Federal Tax Benefit EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesNetOfFederalTaxBenefit	0.053
CY2011	wec	Effective Tax Rate Reconciliation1603 Grant Amount EffectiveTaxRateReconciliation1603GrantAmount	0	USD
CY2012	wec	Effective Tax Rate Reconciliation1603 Grant Amount EffectiveTaxRateReconciliation1603GrantAmount	0	USD
CY2013	wec	Effective Tax Rate Reconciliation1603 Grant Amount EffectiveTaxRateReconciliation1603GrantAmount	-7400000	USD
CY2011	wec	Effective Tax Rate Reconciliation1603 Grant Percent EffectiveTaxRateReconciliation1603GrantPercent	0.000
CY2012	wec	Effective Tax Rate Reconciliation1603 Grant Percent EffectiveTaxRateReconciliation1603GrantPercent	0.000
CY2013	wec	Effective Tax Rate Reconciliation1603 Grant Percent EffectiveTaxRateReconciliation1603GrantPercent	-0.008
CY2013	wec	Exercise Price Of Stock Option On Grant Date ExercisePriceOfStockOptionOnGrantDate	no less than 100% of the common stock's fair market value
CY2012Q4	wec	Fair Value Assets Measured On Recurring Basis Total Assets FairValueAssetsMeasuredOnRecurringBasisTotalAssets	21900000	USD
CY2013Q4	wec	Fair Value Assets Measured On Recurring Basis Total Assets FairValueAssetsMeasuredOnRecurringBasisTotalAssets	11800000	USD
CY2012Q4	wec	Fair Value Liabilities Measured On Recurring Basis Total Liabilities FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities	1900000	USD
CY2013Q4	wec	Fair Value Liabilities Measured On Recurring Basis Total Liabilities FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities	300000	USD
CY2011	wec	Fuel And Purchased Power FuelAndPurchasedPower	1169700000	USD
CY2012	wec	Fuel And Purchased Power FuelAndPurchasedPower	1098600000	USD
CY2013	wec	Fuel And Purchased Power FuelAndPurchasedPower	1153000000	USD
CY2013	wec	Fuel Cost Tolerance Range Set By Regulators Percent FuelCostToleranceRangeSetByRegulatorsPercent	0.02
CY2013	wec	Health Care Cost Trend Rate Post Specified Age HealthCareCostTrendRatePostSpecifiedAge	65
CY2013	wec	Health Care Cost Trend Rate Up To Specified Age HealthCareCostTrendRateUpToSpecifiedAge	65
CY2011	wec	Income Tax Expense Benefit Effective Tax Rate IncomeTaxExpenseBenefitEffectiveTaxRate	0.340
CY2013	wec	Income Tax Expense Benefit Effective Tax Rate IncomeTaxExpenseBenefitEffectiveTaxRate	0.369
CY2012	wec	Income Tax Expense Benefit Effective Tax Rate IncomeTaxExpenseBenefitEffectiveTaxRate	0.359
CY2012	wec	Income Tax Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity IncomeTaxReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	12300000	USD
CY2013	wec	Income Tax Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity IncomeTaxReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	6400000	USD
CY2011	wec	Income Tax Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity IncomeTaxReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	20800000	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
CY2013	wec	Matching Contributions Under Savings Plans MatchingContributionsUnderSavingsPlans	14200000	USD
CY2012	wec	Matching Contributions Under Savings Plans MatchingContributionsUnderSavingsPlans	13800000	USD
CY2013	wec	Maximum Duration To Recover Outstanding Regulatory Assets MaximumDurationToRecoverOutstandingRegulatoryAssets	P8Y
CY2013	wec	Maximum Percentage Award Based On Performance Unit MaximumPercentageAwardBasedOnPerformanceUnit	1.75
CY2013	wec	Minimum Duration To Recover Outstanding Regulatory Assets MinimumDurationToRecoverOutstandingRegulatoryAssets	P1Y
CY2013	wec	Minimum Energy Requirement In Gas Fired Cogeneration Facility MinimumEnergyRequirementInGasFiredCogenerationFacility	0
CY2013	wec	Minimum Percentage Award Based On Performance Unit MinimumPercentageAwardBasedOnPerformanceUnit	0.00
CY2013Q4	wec	Number Of Series Of Tax Exempt Pollution Control Refunding Bonds NumberOfSeriesOfTaxExemptPollutionControlRefundingBonds	2
CY2011	wec	Other Income And Deductions Net Other OtherIncomeAndDeductionsNetOther	3300000	USD
CY2012	wec	Other Income And Deductions Net Other OtherIncomeAndDeductionsNetOther	-500000	USD
CY2013	wec	Other Income And Deductions Net Other OtherIncomeAndDeductionsNetOther	500000	USD
CY2013Q4	wec	Other Post Retirement Employee Benefits Asset Allocation In Equity Investments OtherPostRetirementEmployeeBenefitsAssetAllocationInEquityInvestments	0.60
CY2013Q4	wec	Other Post Retirement Employee Benefits Asset Allocation In Fixed Income Investments OtherPostRetirementEmployeeBenefitsAssetAllocationInFixedIncomeInvestments	0.40
CY2013Q4	wec	Percentage Of Equity Method Investment Exceeding Consolidated Net Assets PercentageOfEquityMethodInvestmentExceedingConsolidatedNetAssets	0.25
CY2013	wec	Power Capacity Under Capital Lease PowerCapacityUnderCapitalLease	236
CY2013	wec	Power Purchase Contract Expected Future Renewable Period PowerPurchaseContractExpectedFutureRenewablePeriod	P10Y
CY2013	wec	Power Purchase Contract Period PowerPurchaseContractPeriod	P25Y
CY2013	wec	Preferred Interest Rate PreferredInterestRate	0.0360
CY2011	wec	Proceeds From Sale Of Interest In Unit ProceedsFromSaleOfInterestInUnit	38000000	USD
CY2012Q4	wec	Property Related Deferred Tax Assets Non Current PropertyRelatedDeferredTaxAssetsNonCurrent	28300000	USD
CY2013Q4	wec	Property Related Deferred Tax Assets Non Current PropertyRelatedDeferredTaxAssetsNonCurrent	28200000	USD
CY2013Q4	wec	Reclassificationofdeferredtaxassets Reclassificationofdeferredtaxassets	59000000	USD
CY2013	wec	Regulatory Asset Value At End Of Life Of Contract RegulatoryAssetValueAtEndOfLifeOfContract	0	USD
CY2013Q4	wec	Regulatoryassetsearningareturnbasedonshorttermrates Regulatoryassetsearningareturnbasedonshorttermrates	82700000	USD
CY2012	wec	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate	0.020
CY2013	wec	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate	0.020
CY2011	wec	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate	0.020
CY2013	wec	Stock Equity To Total Capitalization StockEquityToTotalCapitalization	is less than 25% and 20%
CY2013Q4	wec	Total Capitalization TotalCapitalization	8626600000	USD
CY2012Q4	wec	Total Capitalization TotalCapitalization	8619300000	USD
CY2012Q4	wec	Total Deferred Charges And Other Assets TotalDeferredChargesAndOtherAssets	2026400000	USD
CY2013Q4	wec	Total Deferred Charges And Other Assets TotalDeferredChargesAndOtherAssets	1872900000	USD
CY2013Q4	wec	Total Deferred Credits And Other Liabilities TotalDeferredCreditsAndOtherLiabilities	4646400000	USD
CY2012Q4	wec	Total Deferred Credits And Other Liabilities TotalDeferredCreditsAndOtherLiabilities	4224300000	USD
CY2013	dei	Amendment Flag AmendmentFlag	false
CY2013	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2013	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2013	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013	dei	Document Period End Date DocumentPeriodEndDate	2013-12-31
CY2013	dei	Document Type DocumentType	10-K
CY2013	dei	Entity Central Index Key EntityCentralIndexKey	0000783325
CY2014Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	225946296	shares
CY2013	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013Q2	dei	Entity Public Float EntityPublicFloat	9300000000	USD
CY2013	dei	Entity Registrant Name EntityRegistrantName	WISCONSIN ENERGY CORP
CY2013	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2013	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0000107815-14-000041-index-headers.html	Edgar Link	pending
0000107815-14-000041-index.html	Edgar Link	pending
0000107815-14-000041.txt	Edgar Link	pending
0000107815-14-000041-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
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report.css	Edgar Link	pending
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wec-20131231.xml	Edgar Link	completed
wec-20131231.xsd	Edgar Link	pending
wec-20131231_cal.xml	Edgar Link	unprocessable
wec-20131231_def.xml	Edgar Link	unprocessable
wec-20131231_lab.xml	Edgar Link	unprocessable
wec-20131231_pre.xml	Edgar Link	unprocessable
wec1231201310-k.htm	Edgar Link	pending
wec12312013ex211.htm	Edgar Link	pending
wec12312013ex231.htm	Edgar Link	pending
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wec12312013ex312.htm	Edgar Link	pending
wec12312013ex321.htm	Edgar Link	pending
wec12312013ex322.htm	Edgar Link	pending
weclogo.jpg	Edgar Link	pending

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$WEC
WEC ENERGY GROUP, INC. Stock $wec

2012 Q4 Form 10-K Financial Statement

#000010781514000041 Filed on February 27, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WEC WEC ENERGY GROUP, INC. Stock $wec

2012 Q4 Form 10-K Financial Statement

#000010781514000041 Filed on February 27, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WEC
WEC ENERGY GROUP, INC. Stock $wec