Income Taxes - Schedule of Transactions Affecting Valuation Allowance on Deferred Tax Assets (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation Allowance [Line Items]
Balance, beginning of year	$ 195.7	$ 237.5	$ 255.9
Current year expense-net	13.3	(44.8)	34.5
Write-offs			(50.1)
Foreign exchange and other	(8.3)	3.0	(2.8)
Balance, end of year	$ 200.7	$ 195.7	$ 237.5