Income Taxes - Components of Income Tax Expense (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. Federal, Current	$ 6.5	$ (4.8)	$ 7.7
U.S. Federal, Deferred	7.0	(5.3)	6.3
State, Current	(2.3)	(0.7)	0.4
State, Deferred	2.4	(5.2)	7.6
Foreign, Current	27.8	27.3	24.4
Foreign, Deferred	3.5	(1.3)	8.5
Total	$ 44.9	$ 10.0	$ 54.9