Derivatives and Fair Value Measurements - Gains and Losses on Hedging Derivatives (Details) - Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Total (loss) gain recognized in income	$ (251.8)	$ 0.4	$ (296.0)	$ 24.3
Gain (loss) realized in income on derivatives	(14.0)	15.8	(24.5)	34.4
Unrealized (loss) gain recognized in income on derivatives	(237.8)	(15.4)	(271.5)	(10.1)
Foreign currency option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total (loss) gain recognized in income	(1.0)	3.9	(5.3)	5.2
Gain (loss) realized in income on derivatives	(1.6)	3.2	3.0	1.6
Unrealized (loss) gain recognized in income on derivatives	0.6	0.7	(8.3)	3.6
Derivative contracts related to forecasted sales
Derivative Instruments, Gain (Loss) [Line Items]
Total (loss) gain recognized in income	(251.5)	(3.3)	(292.1)	19.6
Gain (loss) realized in income on derivatives	(13.1)	12.8	(28.1)	30.9
Unrealized (loss) gain recognized in income on derivatives	(238.4)	(16.1)	(264.0)	(11.3)
Financial trading contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total (loss) gain recognized in income	0.7	(0.2)	1.4	(0.5)
Gain (loss) realized in income on derivatives	0.7	(0.2)	0.6	1.9
Unrealized (loss) gain recognized in income on derivatives	$ 0.0	$ 0.0	$ 0.8	$ (2.4)