Accounts and Other Receivables, Net - Accounts and Other Receivables, Net (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Receivables from affiliates	$ 2.7	$ 3.5
Allowance for doubtful accounts	(2.0)	(1.9)
Total	338.3	323.0
Trade receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	314.7	294.8
Recoverable VAT and other receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	17.5	21.3
Refundable income taxes
Accounts Notes And Loans Receivable [Line Items]
Refundable income taxes	$ 5.4	$ 5.3