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Condensed Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]    
Net income $ 13.1us-gaap_NetIncomeLoss $ 29.5us-gaap_NetIncomeLoss
Other comprehensive income, net of tax:    
Foreign currency translation adjustments (1.4)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 0.7us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Unrealized losses on derivative contracts (0.3)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (3.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Amortization of prior service costs and actuarial losses 5.1us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 4.0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Total other comprehensive income, net of tax 3.4us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 1.6us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 16.5us-gaap_ComprehensiveIncomeNetOfTax $ 31.1us-gaap_ComprehensiveIncomeNetOfTax