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Accounts and Other Receivables - Accounts and Other Receivables (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]    
Allowance for doubtful accounts $ (2.0) $ (1.2)
Total 400.6 312.5
Trade receivables    
Accounts Notes And Loans Receivable [Line Items]    
Accounts and other receivables 372.5 273.3
Recoverable VAT and other receivables    
Accounts Notes And Loans Receivable [Line Items]    
Accounts and other receivables 15.7 23.8
Other    
Accounts Notes And Loans Receivable [Line Items]    
Receivables from affiliates 2.1 2.8
Refundable income taxes    
Accounts Notes And Loans Receivable [Line Items]    
Refundable income taxes 2.2 3.6
Louisiana Pigment Company, L.P. ("LPC'')    
Accounts Notes And Loans Receivable [Line Items]    
Receivables from affiliates $ 10.1 $ 10.2