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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Notional amount of foreign currency derivative $ 238.7invest_DerivativeNotionalAmount $ 282.0invest_DerivativeNotionalAmount
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount of foreign currency derivative 160.7invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 137.6invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount of foreign currency derivative $ 78.0invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ 144.4invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember