Income Taxes - Component of Income Taxes Expenses (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Currently payable:
U.S. federal and state	$ 29.7	$ 13.3	$ 4.3
Non-U.S.	21.5	14.9	22.0
Total	51.2	28.2	26.3
Deferred income taxes (benefit):
U.S. federal and state	(1.7)	(10.3)	(4.1)
Non-U.S.	10.6	(2.0)	4.3
Total	8.9	(12.3)	0.2
Income tax expense (benefit)	$ 60.1	$ 15.9	$ 26.5