Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Trade accounts receivable:
VAT and other receivables	$ 21.4	$ 20.1
Refundable income taxes	8.3	7.4
Allowance for doubtful accounts	(1.2)	(1.2)
Total	279.1	246.6
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	213.7	194.8
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	12.0	8.8
Trade Accounts Receivable | WCS
Trade accounts receivable:
Accounts receivable	3.4	5.2
Trade Accounts Receivable | BMI and LandWell
Trade accounts receivable:
Accounts receivable	1.3	1.2
Trade Items | LPC
Trade accounts receivable:
Receivable from affiliates	10.1
Trade Items | Contran
Trade accounts receivable:
Receivable from affiliates	0.2	0.2
Trade Items | Other
Trade accounts receivable:
Receivable from affiliates	2.6	2.5
Income Taxes | Contran
Trade accounts receivable:
Receivable from affiliates	$ 7.3	$ 7.6