Receivables, Net - Rollforward of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Total allowance for credit losses – January 1	$ 11.3
Impact of adoption of ASU 2016-13 (See Note 2)	1.7	$ 0.0	$ 0.0
Charges to income	6.2	3.5	3.6
Write-offs	(5.5)	(9.2)	(0.8)
Foreign currency and other	0.4	0.2	(0.6)
Total allowance for credit losses – December 31	15.1	11.3
Total allowance for credit losses	$ 15.6	$ 12.8	$ 18.3	$ 16.1