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Fair Value Measurements (Debt) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]      
Long-term debt $ 240.4us-gaap_LongTermDebt $ 240.4us-gaap_LongTermDebt  
Long-term debt, fair value 121.2us-gaap_LongTermDebtFairValue    
Convertible senior notes (Predecessor)     530.0us-gaap_ShortTermBankLoansAndNotesPayable
Convertible senior notes, fair value     $ 184.1us-gaap_ConvertibleDebtFairValueDisclosures