Derivative Instruments and Hedging Activities - Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Designated derivatives
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 20.0	$ 27.3
Foreign currency forward contracts | Designated derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	13.2	1.0
Foreign currency forward contracts | Designated derivatives | Other non-current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0.5	0.0
Foreign currency forward contracts | Designated derivatives | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	5.8	4.7
Foreign currency forward contracts | Non-designated derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	7.8	3.3
Foreign currency forward contracts | Non-designated derivatives | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2.4	3.7
Cross-currency swap | Designated derivatives | Other non-current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 6.3	$ 26.3