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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

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