Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current Tax Provision:
Federal	$ 203.0	$ 216.4	$ 132.8
State	57.2	50.7	95.4
Non-U.S.	141.7	150.5	162.7
Total	401.9	417.6	390.9
Deferred Tax Provision:
Federal	8.8	16.5	33.8
State	5.4	16.5	(13.8)
Non-U.S.	2.2	1.3	(9.5)
Total	16.4	34.3	10.5
Effective Tax Rate	$ 418.3	$ 451.9	$ 401.4