Derivatives and Hedging Activities - Effect of Derivative Instruments on Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments Gain Loss [Line Items]
Amount of (Loss) Gain Recognized in Earnings on Derivatives	$ 2.7	$ 0.5	$ 1.5	$ 0.8
Derivatives designated as hedging instruments | Cash Flow Hedge
Derivative Instruments Gain Loss [Line Items]
Amount of (Loss) Gain Recognized in Earnings on Derivatives	(0.7)	2.1	(4.1)	3.2
Derivatives designated as hedging instruments | Cash Flow Hedge | Foreign currency forward and option contracts
Derivative Instruments Gain Loss [Line Items]
Amount of (Loss) Gain Recognized in Earnings on Derivatives	(0.8)	2.0	(4.2)	3.1
Derivatives designated as hedging instruments | Cash Flow Hedge | Treasury locks
Derivative Instruments Gain Loss [Line Items]
Amount of (Loss) Gain Recognized in Earnings on Derivatives	0.1	0.1	0.1	0.1
Derivatives not designated as hedging instruments | Foreign currency forward and option contracts
Derivative Instruments Gain Loss [Line Items]
Amount of (Loss) Gain Recognized in Earnings on Derivatives	$ 3.4	$ (1.6)	$ 5.6	$ (2.4)