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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

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