Accounts and Other Receivables - Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts	$ (1.1)	$ (1.1)
Total	252.9	220.8
Trade receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	213.7	194.8
Other
Accounts Notes And Loans Receivable [Line Items]
Receivable from affiliates	2.5	2.5
Recoverable VAT and other receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	19.6	17.8
Refundable income taxes
Accounts Notes And Loans Receivable [Line Items]
Refundable income taxes	7.5	$ 6.8
Louisiana Pigment Company, L.P.
Accounts Notes And Loans Receivable [Line Items]
Receivable from affiliates	10.1
Valhi | Income taxes, net
Accounts Notes And Loans Receivable [Line Items]
Receivable from affiliates	$ 0.6