Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Trade accounts receivable:
VAT and other receivables	$ 17.5	$ 18.6
Refundable income taxes	2.3	1.0
Allowance for doubtful accounts	(2.1)	(1.1)
Total	383.7	272.2
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	326.9	224.8
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	11.8	10.4
Trade Accounts Receivable | Waste Control Specialists
Trade accounts receivable:
Accounts receivable	11.4	14.0
Trade Accounts Receivable | BMI and LandWell
Trade accounts receivable:
Accounts receivable	1.6	1.3
Trade Items | Contran
Trade accounts receivable:
Receivable from affiliates		0.4
Trade Items | LPC
Trade accounts receivable:
Receivable from affiliates	9.3
Trade Items | Other
Trade accounts receivable:
Receivable from affiliates	3.5	$ 2.8
Income Taxes | Contran
Trade accounts receivable:
Receivable from affiliates	$ 1.5