Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current Tax Provision:
Federal	$ 132.8	$ 347.3	$ 495.8
State	95.4	38.3	65.3
Non-U.S.	162.7	125.4	99.3
Total	390.9	511.0	660.4
Deferred Tax Provision:
Federal	33.8	(96.4)	(159.0)
State	(13.8)	24.6	(18.9)
Non-U.S.	(9.5)	(4.3)	2.1
Total	10.5	(76.1)	(175.8)
Provision for Income Taxes	$ 401.4	$ 434.9	$ 484.6