Income Taxes - Component of Income Tax Provision (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 194.4	$ 185.6	$ 190.9
Foreign	63.7	45.5	60.8
State	73.9	73.0	72.7
Total	332.0	304.1	324.4
Deferred:
Federal	(53.9)	(51.9)	(64.6)
Foreign	(20.8)	(14.9)	4.0
State	(8.2)	(10.2)	(27.4)
Total	(82.9)	(77.0)	(88.0)
Provision for income taxes	$ 249.1	$ 227.1	$ 236.4