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Accounts and Other Receivables - Accounts and Other Receivables (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]    
Allowance for doubtful accounts $ (1.7) $ (1.2)
Total 354.0 312.5
Trade receivables    
Accounts Notes And Loans Receivable [Line Items]    
Accounts and other receivables 317.9 273.3
Recoverable VAT and other receivables    
Accounts Notes And Loans Receivable [Line Items]    
Accounts and other receivables 21.5 23.8
Other    
Accounts Notes And Loans Receivable [Line Items]    
Receivables from affiliates 2.7 2.8
Refundable income taxes    
Accounts Notes And Loans Receivable [Line Items]    
Refundable income taxes 3.4 3.6
Louisiana Pigment Company, L.P. ("LPC'')    
Accounts Notes And Loans Receivable [Line Items]    
Receivables from affiliates $ 10.2 $ 10.2