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Income Taxes - Schedule Of Income Tax Difference From Statutory Rate (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
Income Tax Disclosure [Abstract]
Federal tax at statutory rate										$ 253.5	$ 315.5	$ 268.7
State taxes, net of federal benefits										23.1	29.7	20.8
Foreign rate differential										(19.3)	(56.2)	(44.7)
U.S. tax on foreign earnings										29.3	55.0	43.7
Research and development credit										(37.1)	(32.7)	(25.2)
Share-based compensation not benefited										14.3	13.5	9.9
Unrecognized tax benefit related to share-based compensation										39.3	0.0	0.0
Reversal of unrecognized tax benefits										(4.0)	(8.4)	(5.2)
Excess tax benefits related to share-based compensation		$ (21.3)	$ (47.9)	$ (31.6)	$ (65.4)	$ (33.7)	$ (28.8)	$ (11.3)	$ (72.7)	(166.2)	(146.5)	(116.2)
Deferred tax remeasurement due to Swiss Tax Reform	$ (51.3)									0.0	(51.3)	0.0
Other										7.3	1.8	2.7
Total income tax expense										$ 140.2	$ 120.4	$ 154.5

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