Hedging Activities, Derivative Instruments and Fair Value Measurements - Derivative Instruments not Designated as Accounting Hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Total foreign currency transaction gains (losses), net	$ (3.4)	$ (4.9)	$ 14.7	$ (6.9)
Foreign currency forward contracts gains (losses)
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Total foreign currency transaction gains (losses), net	$ 0.7	$ 0.5	$ (0.1)	$ (2.1)