Income Taxes - Component of Income Tax Provision (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 190.9	$ 190.0	$ 84.6
Foreign	60.8	43.5	44.9
State	72.7	72.5	50.8
Total	324.4	306.0	180.3
Deferred:
Federal	(64.6)	(97.7)	(50.7)
Foreign	4.0	(3.8)	(8.9)
State	(27.4)	(53.9)	(27.5)
Total	(88.0)	(155.4)	(87.1)
Provision for income taxes	$ 236.4	$ 150.6	$ 93.2