Income Taxes - Schedule of Sources of Income Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
U.S.	$ 751.6	$ 790.5	$ 831.0
Foreign	106.1	85.6	206.0
Income before income taxes	$ 857.7	$ 876.1	$ 1,037.0