Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Trade accounts receivable:
VAT and other receivables	$ 20.1	$ 24.3
Allowance for doubtful accounts	(1.2)	(1.8)
Total	228.9	271.3
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	194.8	230.9
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	8.8	8.8
Trade Accounts Receivable | WCS
Trade accounts receivable:
Accounts receivable	5.2	7.7
Trade Accounts Receivable | BMI and LandWell
Trade accounts receivable:
Accounts receivable	$ 1.2	$ 1.4