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Income Taxes - Schedule Of Income Tax Difference From Statutory Rate (Detail) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal tax at statutory rate					$ 383.8	$ 343.3	$ 265.5
State taxes, net of federal benefits					16.0	14.0	8.9
Foreign rate differential					(107.3)	(86.2)	(67.4)
Research and development credit					(15.3)	(7.8)	(6.4)
Share-based compensation not benefited					10.8	3.6	6.9
Domestic production activities deduction					(7.9)	(8.0)	(5.3)
Reversal of unrecognized tax benefits					(62.4)	(15.8)	(6.4)
Reversal of share-based compensation from intercompany charges					0.0	0.0	(25.0)
Tax Cuts and Jobs Act impact					317.8	0.0	0.0
Excess tax benefits	$ (19.9)	$ (19.7)	$ (30.6)	$ (32.6)	(102.8)	0.0	0.0
Other					3.8	1.8	(1.1)
Total income tax expense					$ 436.5	$ 244.9	$ 169.7

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