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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Aug. 31, 2019	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Holiday [Line Items]
U.S. tax on foreign earnings										$ 29.3	$ 55.0	$ 43.7
Deferred tax remeasurement due to Swiss Tax Reform	$ 51.3									0.0	51.3	0.0
Valuation allowance		$ (81.4)				$ (57.2)				(81.4)	(57.2)
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount		21.3	$ 47.9	$ 31.6	$ 65.4	33.7	$ 28.8	$ 11.3	$ 72.7	166.2	146.5	116.2
Total gross unrecognized tax benefits		176.3				96.7				176.3	96.7	78.8	$ 65.4
Net increase in gross unrecognized tax benefits										39.3
Interest and penalties related to unrecognized tax benefits accrued		11.0				$ 2.9				11.0	$ 2.9	$ 2.6
Swiss Federal Tax Administration (FTA)
Income Tax Holiday [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign		253.0								253.0
State and Local Jurisdiction [Member]
Income Tax Holiday [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign		$ 534.0								$ 534.0

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