Financial Instruments and Fair Value Measurements - Gains and Losses Recognized on Foreign Exchange Forward Contracts (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other (expense), net | Foreign Exchange Forward Contract
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Amount of gain (loss) recognized	$ 4.5	$ 3.9	$ (4.3)	$ (24.6)