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Statements of Consolidated Comprehensive Income (Loss) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]                      
Net income $ 15.6us-gaap_NetIncomeLoss $ 15.9us-gaap_NetIncomeLoss $ 24.5us-gaap_NetIncomeLoss $ 15.8us-gaap_NetIncomeLoss $ 27.3us-gaap_NetIncomeLoss $ 25.4us-gaap_NetIncomeLoss $ 18.6us-gaap_NetIncomeLoss $ 33.5us-gaap_NetIncomeLoss $ 71.8us-gaap_NetIncomeLoss $ 104.8us-gaap_NetIncomeLoss $ 85.8us-gaap_NetIncomeLoss
Defined benefit pension plan and VEBAs:                      
Total actuarial (loss) gain and prior service costs                 (39.0)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 87.0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax [1]  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax                 129.5us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax (2.2)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax [1] (87.8)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax
Reclassification adjustments:                      
Amortization of net actuarial (gain) loss                 (1.8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [2] 1.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [1],[2] 3.1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [2]
Amortization of prior service cost                 10.6us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax [2] 4.2us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax [1],[2] 4.2us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax [2]
Other comprehensive (loss) income relating to defined benefit pension plan and VEBAs                 (120.7)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 7.9us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax [1] 95.1us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Available for sale securities:                      
Unrealized (loss) gain on available for sale securities                 (0.2)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax 1.0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax [1] 0.6us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Reclassification adjustments:                      
Reclassification of unrealized loss upon sale of available for sale securities                 (0.1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (1.0)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1],[3] 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Other comprehensive (loss) income relating to available for sale securities                 (0.3)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax [1] 0.6us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Foreign currency translation adjustment                 0.4us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax 0.2us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax [1] (0.2)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Other comprehensive (loss) income, before tax                 (120.6)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent 8.1us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent [1] 95.5us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Income tax benefit (expense) related to items of other comprehensive income (loss)                 45.2us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 [4] (2.8)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 [4] (36.5)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 [4]
Other comprehensive (loss) income, net of tax                 (75.4)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 5.3us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 59.0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive (loss) income                 $ (3.6)us-gaap_ComprehensiveIncomeNetOfTax $ 110.1us-gaap_ComprehensiveIncomeNetOfTax $ 144.8us-gaap_ComprehensiveIncomeNetOfTax
[1] The presentation of other comprehensive income in the table above has been revised from the prior year presentation to reflect separate amounts for actuarial gains and losses and prior service costs related to plan amendments. The 2013 balances were adjusted to reflect this reclassification. The impacts to the prospective amortization of Prior service cost and Accumulated net actuarial (losses) gains were not material.
[2] Amounts reclassified out of Accumulated other comprehensive income relating to VEBA adjustments were included as a component of Net periodic pension benefit income relating to VEBAs.
[3] Amounts reclassified out of Accumulated other comprehensive income relating to sales of available for sale securities were included as a component of Other income (expense), net. The Company uses the specific identification method to determine the amount reclassified out of Accumulated other comprehensive income.
[4] Income tax amounts reclassified out of Accumulated other comprehensive income relating to VEBA adjustments and sales of available for sale securities were included as a component of Income tax provision.