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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