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Accounts and Other Receivables, Net - Accounts and Other Receivables, Net (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]    
Allowance for doubtful accounts $ (1.4) $ (1.1)
Total 320.5 309.4
Trade receivables    
Accounts Notes And Loans Receivable [Line Items]    
Accounts and other receivables 287.4 270.5
Recoverable VAT and other receivables    
Accounts Notes And Loans Receivable [Line Items]    
Accounts and other receivables 17.0 25.4
Other    
Accounts Notes And Loans Receivable [Line Items]    
Receivables from affiliates 2.5 2.2
Refundable income taxes    
Accounts Notes And Loans Receivable [Line Items]    
Refundable income taxes 4.1 7.7
Louisiana Pigment Company, L.P. ("LPC'')    
Accounts Notes And Loans Receivable [Line Items]    
Receivables from affiliates $ 10.9 $ 4.7