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Accounts and other receivables, net - Components of Accounts and Other Receivables (Detail) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Trade accounts receivable:    
VAT and other receivables $ 30.1 $ 33.4
Refundable income taxes 2.1 1.8
Allowance for doubtful accounts (4.1) (4.2)
Total 377.8 340.4
Trade Accounts Receivable | Kronos    
Trade accounts receivable:    
Trade Accounts receivable 330.8 273.6
Trade Accounts Receivable | CompX    
Trade accounts receivable:    
Trade Accounts receivable 17.4 17.1
Trade Accounts Receivable | BMI/LandWell    
Trade accounts receivable:    
Trade Accounts receivable 1.0 1.2
Louisiana Pigment Company, L.P. (LPC)    
Trade accounts receivable:    
Receivables from affiliates   16.9
Contran | Trade Items    
Trade accounts receivable:    
Receivables from affiliates 0.1 0.2
Other | Trade Items    
Trade accounts receivable:    
Receivables from affiliates $ 0.4 $ 0.4