Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Trade accounts receivable:
VAT and other receivables	$ 29.9	$ 35.4
Refundable income taxes	3.0	8.0
Allowance for doubtful accounts	(5.5)	(4.9)
Total	332.5	281.9
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	282.2	220.3
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	19.8	17.9
Trade Accounts Receivable | BMI/LandWell
Trade accounts receivable:
Accounts receivable	2.4	2.3
Contran | Trade Items
Trade accounts receivable:
Receivables from affiliates	0.2	0.2
Other | Trade Items
Trade accounts receivable:
Receivables from affiliates	$ 0.5	$ 2.7