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Consolidated Income Statements (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Revenues $ 4,997.1us-gaap_SalesRevenueEnergyServices $ 4,519.0us-gaap_SalesRevenueEnergyServices $ 4,246.4us-gaap_SalesRevenueEnergyServices
Operating Expenses      
Fuel and purchased power 1,223.3us-gaap_CostOfPurchasedPower 1,153.0us-gaap_CostOfPurchasedPower 1,098.6us-gaap_CostOfPurchasedPower
Cost of gas sold 1,036.1us-gaap_CostOfDomesticRegulatedGasRevenue 674.1us-gaap_CostOfDomesticRegulatedGasRevenue 545.8us-gaap_CostOfDomesticRegulatedGasRevenue
Other operation and maintenance 1,112.4us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations 1,155.0us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations 1,116.1us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations
Depreciation and amortization 408.8us-gaap_DepreciationAndAmortization 388.1us-gaap_DepreciationAndAmortization 364.2us-gaap_DepreciationAndAmortization
Property and revenue taxes 121.8us-gaap_TaxesExcludingIncomeAndExciseTaxes 116.7us-gaap_TaxesExcludingIncomeAndExciseTaxes 121.4us-gaap_TaxesExcludingIncomeAndExciseTaxes
Total Operating Expenses 3,902.4us-gaap_UtilitiesOperatingExpense 3,486.9us-gaap_UtilitiesOperatingExpense 3,246.1us-gaap_UtilitiesOperatingExpense
Treasury Grant 17.4us-gaap_RevenueFromGrants 48.0us-gaap_RevenueFromGrants 0us-gaap_RevenueFromGrants
Operating Income 1,112.1us-gaap_OperatingIncomeLoss 1,080.1us-gaap_OperatingIncomeLoss 1,000.3us-gaap_OperatingIncomeLoss
Income (Loss) from Equity Method Investments 65.9us-gaap_IncomeLossFromEquityMethodInvestments 68.4us-gaap_IncomeLossFromEquityMethodInvestments 65.5us-gaap_IncomeLossFromEquityMethodInvestments
Other Income and Deductions, net 13.4us-gaap_OtherNonoperatingIncomeExpense 18.8us-gaap_OtherNonoperatingIncomeExpense 34.8us-gaap_OtherNonoperatingIncomeExpense
Interest Expense, net 241.5us-gaap_InterestExpense 252.1us-gaap_InterestExpense 248.2us-gaap_InterestExpense
Income (Loss) from Continuing Operations Before Income Taxes 950.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 915.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 852.6us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Total Income Tax Expense, Amount 361.7us-gaap_IncomeTaxExpenseBenefit 337.9us-gaap_IncomeTaxExpenseBenefit 306.3us-gaap_IncomeTaxExpenseBenefit
Net Income 588.3us-gaap_NetIncomeLoss 577.4us-gaap_NetIncomeLoss 546.3us-gaap_NetIncomeLoss
Earnings Per Share (Basic)      
Earnings Per Share, Basic $ 2.61us-gaap_EarningsPerShareBasic $ 2.54us-gaap_EarningsPerShareBasic $ 2.37us-gaap_EarningsPerShareBasic
Earnings Per Share (Diluted)      
Total Earnings Per Share (Diluted) $ 2.59us-gaap_EarningsPerShareDiluted $ 2.51us-gaap_EarningsPerShareDiluted $ 2.35us-gaap_EarningsPerShareDiluted
Weighted Average Common Shares Outstanding (Millions)      
Basic 225.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 227.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 230.2us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 227.5us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 229.7us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 232.8us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Transmission Affiliate [Member]      
Operating Expenses      
Income (Loss) from Equity Method Investments $ 66.0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wec_TransmissionAffiliateMember
$ 68.5us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wec_TransmissionAffiliateMember
$ 65.7us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wec_TransmissionAffiliateMember