Income Taxes - Components of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
U.S.	$ (75.8)	$ (123.8)	$ (65.1)
Foreign	124.5	107.9	115.7
Income (loss) from continuing operations before income taxes	$ 48.7	$ (15.9)	$ 50.6