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Income Taxes - Schedule Of Income Tax Difference From Statutory Rate (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal tax at statutory rate									$ 268.7	$ 386.7	$ 344.9
State taxes, net of federal benefits									20.8	16.0	14.0
Foreign rate differential									(44.7)	(115.7)	(91.2)
U.S. tax on foreign earnings									43.7	8.4	5.0
Research and development credit									(25.2)	(15.3)	(7.8)
Share-based compensation not benefited									9.9	10.8	3.6
Domestic production activities deduction									0.0	(7.9)	(8.0)
Reversal of unrecognized tax benefits									(5.2)	(62.4)	(15.8)
Tax Cuts and Jobs Act impact									0.5	317.8	0.0
Excess tax benefits related to share-based compensation arrangements	$ (15.8)	$ (24.1)	$ (21.6)	$ (54.7)	$ (19.9)	$ (19.7)	$ (30.6)	$ (32.6)	(116.2)	(102.8)	0.0
Other									2.2	(1.7)	2.3
Total income tax expense									$ 154.5	$ 433.9	$ 247.0

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