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Fair Value Measurements - Long-term Debt (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt, Carrying value $ 330.4us-gaap_DebtInstrumentCarryingAmount $ 148.0us-gaap_DebtInstrumentCarryingAmount
Long-term debt, Estimated fair value 330.9us-gaap_LongTermDebtFairValue  
Senior Loans [Member]    
Debt Instrument [Line Items]    
Long-term debt, Carrying value 298.9us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorLoansMember		 132.0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorLoansMember
Senior Loans [Member] | Level 3 [Member]    
Debt Instrument [Line Items]    
Long-term debt, Estimated fair value 298.9us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Junior Loans [Member]    
Debt Instrument [Line Items]    
Long-term debt, Carrying value 31.5us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_JuniorLoansMember		 16.0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_JuniorLoansMember
Junior Loans [Member] | Level 3 [Member]    
Debt Instrument [Line Items]    
Long-term debt, Estimated fair value $ 32.0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= us-gaap_JuniorLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member