Basis of Presentation and Summary of Significant Accounting Policies - Allowance for Credit Losses (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of year	$ 15.9	$ 14.3
Credit loss expense	(3.9)	5.7
Write-offs and other	(3.3)	(4.4)
Balance, end of year	$ 8.7	15.9
Trade Receivables | ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Additional allowance recognized due to adoption of Topic ASC 326		$ 0.3