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Accounts and Other Receivables - Accounts and Other Receivables (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for doubtful accounts | $ (1.5) | $ (1.4)
Total | 390.2 | 346.5
Trade receivables |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Accounts and other receivables | 347.3 | 301.4
Recoverable VAT and other receivables |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Accounts and other receivables | 17.1 | 19.0
Other |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Receivable from affiliates | 3.4 | 3.2
Refundable income taxes |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Refundable income taxes | 0.2 | 0.1
Valhi | Income taxes, net |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Receivable from affiliates | 14.3 | 15.3
Louisiana Pigment Company, L.P. ("LPC'') |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Receivable from affiliates | $ 9.4 | $ 8.9

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