Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Trade accounts receivable:
VAT and other receivables	$ 18.6	$ 20.1
Allowance for doubtful accounts	(1.1)	(1.2)
Total	268.0	228.9
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	224.8	194.8
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	10.4	8.8
Trade Accounts Receivable | WCS
Trade accounts receivable:
Accounts receivable	14.0	5.2
Trade Accounts Receivable | BMI and LandWell
Trade accounts receivable:
Accounts receivable	$ 1.3	$ 1.2