Allowance for Doubtful Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 15.0	$ 17.2
Charged to operations	12.8	7.6
Write-offs	(10.2)	(9.8)
Ending Balance	$ 17.6	$ 15.0