Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Aggregate notional amount	$ 871.7	$ 1,103.0
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Aggregate notional amount	902.1	721.0
Foreign Exchange Contract | Other current assets | Designated as Hedging Instrument
Summary of derivatives designated as hedging instruments
Asset derivatives	50.4	16.6
Foreign Exchange Contract | Other current assets | Not Designated as Hedging Instrument
Summary of derivatives designated as hedging instruments
Asset derivatives	4.0	10.3
Foreign Exchange Contract | Investments and other assets | Designated as Hedging Instrument
Summary of derivatives designated as hedging instruments
Asset derivatives	6.6	0.3
Foreign Exchange Contract | Accrued expenses and other | Designated as Hedging Instrument
Summary of derivatives designated as hedging instruments
Liability derivatives		10.2
Foreign Exchange Contract | Accrued expenses and other | Not Designated as Hedging Instrument
Summary of derivatives designated as hedging instruments
Liability derivatives	9.0	2.0
Foreign Exchange Contract | Other long-term liabilities | Designated as Hedging Instrument
Summary of derivatives designated as hedging instruments
Liability derivatives	4.6	2.5
Euro | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Aggregate notional amount	871.7	945.5
Swiss francs | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Aggregate notional amount	0.0	80.8
Canadian dollar | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Aggregate notional amount	$ 0.0	$ 76.7