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Derivative Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Derivative Instruments, Gain (Loss)    
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 2.6us-gaap_DerivativeGainLossOnDerivativeNet $ 1.8us-gaap_DerivativeGainLossOnDerivativeNet
Designated as Hedging Instrument [Member] | Interest-rate swap    
Derivative Instruments, Gain (Loss)    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 2.0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 2.1us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Derivatives not designated as hedging instruments | Forward exchange contracts    
Derivative Instruments, Gain (Loss)    
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 0.6us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ (0.3)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember