Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Trade accounts receivable:
VAT and other receivables	$ 30.3	$ 38.0
Refundable income taxes	4.0	4.5
Allowance for doubtful accounts	(3.2)	(2.0)
Total	443.3	403.7
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	374.1	326.3
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	17.8	15.6
Trade Accounts Receivable | BMI and LandWell
Trade accounts receivable:
Accounts receivable	2.0	2.8
Contran | Trade Items
Trade accounts receivable:
Receivables from affiliates	0.3	0.1
Louisiana Pigment Company, L.P. ("LPC")
Trade accounts receivable:
Receivables from affiliates	15.2	15.8
Other | Trade Items
Trade accounts receivable:
Receivables from affiliates	$ 2.8	$ 2.6