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Accounts and Other Receivables, Net - Accounts and Other Receivables, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]    
Allowance for doubtful accounts $ (2.0) $ (1.9)
Total 384.0 323.0
Trade receivables    
Accounts Notes And Loans Receivable [Line Items]    
Accounts and other receivables 346.6 294.8
Recoverable VAT and other receivables    
Accounts Notes And Loans Receivable [Line Items]    
Accounts and other receivables 19.9 21.3
Other    
Accounts Notes And Loans Receivable [Line Items]    
Receivables from affiliates 2.4 3.5
Refundable income taxes    
Accounts Notes And Loans Receivable [Line Items]    
Refundable income taxes 3.7 $ 5.3
Louisiana Pigment Company, L.P. ("LPC'')    
Accounts Notes And Loans Receivable [Line Items]    
Receivables from affiliates $ 13.4