Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income (loss) before income taxes:
U.S.	$ 109.3	$ (0.7)	$ (73.6)
International	(13.3)	(62.2)	(16.7)
Income (loss) before income taxes	96.0	(62.9)	(90.3)
Current:
U.S.	7.4	4.5	0.9
State and local	4.0	1.9	0.4
International	25.7	5.8	22.3
Total current income tax expense	37.1	12.2	23.6
Deferred:
U.S.	12.3	7.8	(22.3)
State and local	(4.6)	(2.1)	(5.0)
International	(3.6)	(7.4)	(11.2)
Total deferred income tax expense (benefit)	4.1	(1.7)	(38.5)
Total income tax expense (benefit)	$ 41.2	$ 10.5	$ (14.9)