Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Trade accounts receivable:
VAT and other receivables	$ 43.6	$ 38.0
Refundable income taxes	2.7	4.5
Allowance for doubtful accounts	(4.8)	(2.0)
Total	386.4	403.7
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	304.0	326.3
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	19.2	15.6
Trade Accounts Receivable | BMI/LandWell
Trade accounts receivable:
Accounts receivable	2.1	2.8
Louisiana Pigment Company, L.P. ("LPC")
Trade accounts receivable:
Receivables from affiliates	16.7	15.8
Contran | Trade Items
Trade accounts receivable:
Receivables from affiliates	0.4	0.1
Other | Trade Items
Trade accounts receivable:
Receivables from affiliates	$ 2.5	$ 2.6