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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Notional amount of foreign currency derivatives $ 196.9invest_DerivativeNotionalAmount $ 238.7invest_DerivativeNotionalAmount
Cash flow hedges [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount of foreign currency derivatives 118.5invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 160.7invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Non-designated derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount of foreign currency derivatives $ 78.4invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ 78.0invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember