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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income (loss) $ (15.4)us-gaap_NetIncomeLoss $ (50.8)us-gaap_NetIncomeLoss
Predecessor [Member]    
Net income (loss)   (50.8)us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Amortization of actuarial (gains) losses, net   0.3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Amortization of prior service costs (credits)   (0.1)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Other comprehensive income (loss), before tax   0.2us-gaap_OtherComprehensiveIncomeLossBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Income tax expense related to items of other comprehensive income   (0.1)us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Other comprehensive income (loss), net of tax   0.1us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Comprehensive income (loss)   (50.7)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Successor [Member]    
Net income (loss) (15.4)us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Amortization of actuarial (gains) losses, net 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Amortization of prior service costs (credits) (0.1)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Other comprehensive income (loss), before tax (0.1)us-gaap_OtherComprehensiveIncomeLossBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Income tax expense related to items of other comprehensive income 0us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Other comprehensive income (loss), net of tax (0.1)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Comprehensive income (loss) $ (15.5)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember