Derivative Instruments and Hedging Activities - Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Designated derivatives
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 1.4	$ 3.0	$ 2.3
Foreign currency forward contracts | Designated derivatives | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	4.1	3.1	3.8
Foreign currency forward contracts | Designated derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	1.4	3.0	2.0
Foreign currency forward contracts | Non-designated derivatives | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	2.2	0.7	1.0
Foreign currency forward contracts | Non-designated derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2.4	2.0	1.9
Interest rate swap agreements | Designated derivatives | Other non-current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0.0	$ 0.0	$ 0.3