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Other Comprehensive (Loss) Income (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined benefit pension plan and VEBAs:      
Net actuarial (loss) gain arising during the period $ (39.0)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax $ 87.0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax [1]  
Prior service cost arising during the period (90.5)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax (84.8)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax [1]  
Total actuarial (loss) gain and prior service costs (129.5)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax 2.2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax [1] 87.8us-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) gain 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
Defined benefit pension plan and VEBAs:      
Net actuarial loss (gain) arising during the period 14.5us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax [4] (32.5)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax [4]  
Prior service cost arising during the period 33.8us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect [4] 31.8us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect [4]  
Total actuarial (loss) gain and prior service costs 48.3us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax [4] (0.7)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax [4] (33.5)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax [4]
Reclassification adjustments:      
Amortization of net actuarial loss (gain) 0.7us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax [2],[4] (0.5)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax [2],[4] (1.1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax [2],[4]
Amortization of prior service cost (3.9)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax [2],[4] (1.6)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax [2],[4] (1.7)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax [2],[4]
Other comprehensive income relating to defined benefit pension plan and VEBAs 45.1us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax [4] (2.8)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax [4] (36.3)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax [4]
Available for sale securities:      
Unrealized gain (loss) on available for sale securities 0.1us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax [4] (0.3)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax [4] (0.2)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax [4]
Reclassification adjustments:      
Reclassification of unrealized gain upon sale of available for sale securities 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax [3],[4] 0.3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax [3],[4]  
Other comprehensive income relating to available for sale securities 0.1us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax [4] 0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax [4]  
Foreign currency translation adjustment 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax [4] 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax [4] 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax [4]
Other comprehensive income (loss) 45.2us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 [4] (2.8)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 [4] (36.5)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 [4]
Defined benefit pension plan and VEBAs:      
Net actuarial (loss) gain arising during the period (24.5)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 54.5us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax  
Prior service cost arising during the period (56.7)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax (53.0)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax  
Total actuarial (loss) gain and prior service costs (81.2)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax 1.5us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax 54.3us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax
Reclassification adjustments:      
Amortization of net actuarial (gain) loss (1.1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [2] 1.0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [2] 2.0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [2]
Amortization of prior service cost 6.7us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [2] 2.6us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [2] 2.5us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [2]
Other comprehensive income relating to defined benefit pension plan and VEBAs (75.6)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 5.1us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 58.8us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Available for sale securities:      
Unrealized (loss) gain on available for sale securities (0.1)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 0.7us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 0.4us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustments:      
Reclassification of unrealized loss upon sale of available for sale securities (0.1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [3] (0.7)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [3]  
Other comprehensive loss relating to available for sale securities (0.2)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax  
Foreign currency translation adjustment 0.4us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 0.2us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (0.2)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Other comprehensive (loss) income, net of tax (75.4)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 5.3us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 59.0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
As Reported      
Defined benefit pension plan and VEBAs:      
Net actuarial (loss) gain arising during the period   2.2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Prior service cost arising during the period   0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Total actuarial (loss) gain and prior service costs   2.2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Reclassification adjustments:      
Amortization of net actuarial (gain) loss   1.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 [2]  
Amortization of prior service cost   4.2us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 [2]  
Other comprehensive (loss) income relating to defined benefit pension plan and VEBAs   7.9us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Available for sale securities:      
Unrealized (loss) gain on available for sale securities   1.0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Reclassification adjustments:      
Reclassification of unrealized (loss) gain upon sale of available for sale securities   (1.0)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 [3]  
Other comprehensive (loss) income relating to available for sale securities   0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Foreign currency translation adjustment   0.2us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Other comprehensive (loss) income, before tax   $ 8.1us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
[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.