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Accounts and other receivables, net - Components of Accounts and Other Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Trade accounts receivable:    
VAT and other receivables $ 33.4 $ 35.4
Allowance for doubtful accounts (4.2) (4.9)
Total 321.1 271.0
Trade Accounts Receivable | Kronos    
Trade accounts receivable:    
Trade Accounts receivable 273.6 220.3
Trade Accounts Receivable | CompX    
Trade accounts receivable:    
Trade Accounts receivable 17.1 17.9
Trade Accounts Receivable | BMI/LandWell    
Trade accounts receivable:    
Trade Accounts receivable $ 1.2 $ 2.3