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Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Trade accounts receivable:    
VAT and other receivables $ 28.9 $ 38.0
Refundable income taxes 5.0 4.5
Allowance for doubtful accounts (3.4) (2.0)
Total 432.3 403.7
Trade Accounts Receivable | Kronos Worldwide, Inc.    
Trade accounts receivable:    
Accounts receivable 372.1 326.3
Trade Accounts Receivable | CompX    
Trade accounts receivable:    
Accounts receivable 17.6 15.6
Trade Accounts Receivable | BMI/LandWell    
Trade accounts receivable:    
Accounts receivable 1.7 2.8
Louisiana Pigment Company, L.P. ("LPC")    
Trade accounts receivable:    
Receivables from affiliates 6.7 15.8
Contran | Trade Items    
Trade accounts receivable:    
Receivables from affiliates 0.4 0.1
Other | Trade Items    
Trade accounts receivable:    
Receivables from affiliates $ 3.3 $ 2.6