Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Trade accounts receivable:
VAT and other receivables	$ 16.5	$ 20.1
Refundable income taxes	4.9	7.4
Allowance for doubtful accounts	(1.3)	(1.2)
Total	302.1	246.6
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	238.8	194.8
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	13.1	8.8
Trade Accounts Receivable | WCS
Trade accounts receivable:
Accounts receivable	10.9	5.2
Trade Accounts Receivable | BMI and LandWell
Trade accounts receivable:
Accounts receivable	1.3	1.2
Trade Items | Contran
Trade accounts receivable:
Receivable from affiliates	0.3	0.2
Trade Items | Other
Trade accounts receivable:
Receivable from affiliates	11.7	2.5
Income Taxes | Contran
Trade accounts receivable:
Receivable from affiliates	$ 5.9	$ 7.6