Derivative Instruments and Hedging Activities - Balance Sheet Location (Details) - Foreign currency forward contracts - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Designated derivatives: | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 4.6	$ 3.1
Designated derivatives: | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2.6	3.0
Non-designated derivatives: | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	8.5	0.7
Non-designated derivatives: | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0.7	$ 2.0