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Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Trade accounts receivable:    
VAT and other receivables $ 35.4 $ 38.0
Allowance for doubtful accounts (4.9) (2.0)
Total 271.0 380.7
Trade Accounts Receivable | Kronos Worldwide, Inc.    
Trade accounts receivable:    
Accounts receivable 220.3 326.3
Trade Accounts Receivable | CompX    
Trade accounts receivable:    
Accounts receivable 17.9 15.6
Trade Accounts Receivable | BMI/LandWell    
Trade accounts receivable:    
Accounts receivable $ 2.3 $ 2.8