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Fair Value Measurement (Fair Value of Financial Instrument) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Long-term Debt $ 2,022.5us-gaap_LongTermDebt
Carrying (Reported) Amount, Fair Value Disclosure  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Long-term Debt 2,022.5us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Obligations under capital lease 20.3us-gaap_CapitalLeaseObligations
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value, Fair Value Disclosure  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Long-term Debt, Fair Value 2,026.1us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Obligations under capital lease $ 19.8us-gaap_CapitalLeaseObligations
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember