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Fair Value on a Nonrecurring Basis (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Level 1  
Fair value assets and liabilities measured on recurring and nonrecurring basis  
Fair Value $ 0us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Level 2  
Fair value assets and liabilities measured on recurring and nonrecurring basis  
Fair Value 1,566.0us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Level 3  
Fair value assets and liabilities measured on recurring and nonrecurring basis  
Fair Value 80.4us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Total  
Fair value assets and liabilities measured on recurring and nonrecurring basis  
Fair Value $ 1,646.4us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember