Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Trade accounts receivable:
VAT and other receivables	$ 38.0	$ 27.2
Allowance for doubtful accounts	(2.0)	(1.9)
Total	380.7	332.1
Trade Accounts Receivable | Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	326.3	294.8
Trade Accounts Receivable | CompX
Trade accounts receivable:
Accounts receivable	15.6	10.8
Trade Accounts Receivable | BMI and LandWell
Trade accounts receivable:
Accounts receivable	$ 2.8	$ 1.2