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Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Changes In Accumulated Other Comprehensive Income [Roll Forward]    
Pension and postretirement plans, Beginning balance $ 44.4us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Amounts reclassified from accumulated other comprehensive income, net of tax (0.5)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax  
Pension and postretirement plans, Ending balance 43.9us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Amortization of defined benefit pension items reclassified to net periodic pension cost:    
Net loss 1.1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [1] 1.9us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [1]
Prior service credit (0.3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax [1] (0.3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax [1]
Total before income tax 0.8us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 1.6us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Income taxes (0.3)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent (0.6)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
Other Comprehensive Income $ 0.5us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 1.0us-gaap_OtherComprehensiveIncomeLossNetOfTax
[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 9 for additional details).