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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income $ 279.9us-gaap_ProfitLoss $ 354.8us-gaap_ProfitLoss $ 284.3us-gaap_ProfitLoss
Cash flow hedges      
Unrealized net gains (losses) arising during period, net of tax of an insignificant amount for all periods presented 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0.7us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (0.2)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of net losses (gains) to net income, net of tax of $1.2 million, $3.6 million, and $2.0 million, respectively (0.1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 1.4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 6.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Cash flow hedges, net (0.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 2.1us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 6.3us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Defined benefit plans      
Pension and other postretirement benefit adjustments arising during period, net of tax of $(3.0) million, $8.9 million, and $(4.4) million, respectively (6.0)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax 13.2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax (6.1)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax
Amortization of pension and other postretirement benefit costs included in net periodic benefit cost, net of tax of $0.8 million, $1.7 million, and $1.0 million, respectively 1.7us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 2.4us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 1.4us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Defined benefit plans, net (4.3)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 15.6us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (4.7)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive income (loss), net of tax (4.4)us-gaap_OtherComprehensiveIncomeLossNetOfTax 17.7us-gaap_OtherComprehensiveIncomeLossNetOfTax 1.6us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income 275.5us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 372.5us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 285.9us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Preferred stock dividends of subsidiary (3.1)us-gaap_DividendsPreferredStockCash (3.1)us-gaap_DividendsPreferredStockCash (3.1)us-gaap_DividendsPreferredStockCash
Noncontrolling interest in subsidiaries 0.1us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 0.1us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 0.2us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Comprehensive income attributed to common shareholders $ 272.5us-gaap_ComprehensiveIncomeNetOfTax $ 369.5us-gaap_ComprehensiveIncomeNetOfTax $ 283.0us-gaap_ComprehensiveIncomeNetOfTax