Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Aggregate notional amount	$ 273.3	$ 243.2
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Aggregate notional amount	742.6	524.0
Foreign Exchange Contract | Other Current Assets | Designated as Hedging Instrument
Summary of derivatives designated as hedging instruments
Asset derivatives	0.6	0.6
Foreign Exchange Contract | Other Current Assets | Not Designated as Hedging Instrument [Member]
Summary of derivatives designated as hedging instruments
Asset derivatives	3.2	1.2
Foreign Exchange Contract | Accrued Liabilities | Designated as Hedging Instrument
Summary of derivatives designated as hedging instruments
Liability derivatives	23.4	11.5
Foreign Exchange Contract | Accrued Liabilities | Not Designated as Hedging Instrument [Member]
Summary of derivatives designated as hedging instruments
Liability derivatives	0.1	2.9
Euro | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Aggregate notional amount	636.3	492.2
Canadian Dollar | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Aggregate notional amount	34.0	31.8
British pound sterling | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Aggregate notional amount	$ 72.3	$ 0