Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Trade accounts receivable:
VAT and other receivables	$ 35.6	$ 35.4
Refundable income taxes	4.3	8.0
Allowance for doubtful accounts	(4.9)	(4.9)
Total	328.8	281.9
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	261.2	220.3
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	18.8	17.9
Trade Accounts Receivable | BMI/LandWell
Trade accounts receivable:
Accounts receivable	1.7	2.3
Louisiana Pigment Company, L.P. ("LPC")
Trade accounts receivable:
Receivables from affiliates	10.4
Contran | Trade Items
Trade accounts receivable:
Receivables from affiliates	0.6	0.2
Other | Trade Items
Trade accounts receivable:
Receivables from affiliates	$ 1.1	$ 2.7