Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Trade accounts receivable:
VAT and other receivables	$ 16.7	$ 18.6
Refundable income taxes	0.7	1.0
Allowance for doubtful accounts	(1.2)	(1.1)
Total	303.0	272.2
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	255.9	224.8
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	13.1	10.4
Trade Accounts Receivable | WCS
Trade accounts receivable:
Accounts receivable	12.4	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	0.5	0.4
Trade Items | Other
Trade accounts receivable:
Receivable from affiliates	$ 3.3	$ 2.8