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Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Trade accounts receivable:    
VAT and other receivables $ 26.2 $ 27.2
Refundable income taxes 6.2 5.7
Allowance for doubtful accounts (2.1) (1.9)
Total 374.2 342.3
Trade Accounts Receivable | Kronos Worldwide, Inc.    
Trade accounts receivable:    
Accounts receivable 321.6 294.8
Trade Accounts Receivable | CompX    
Trade accounts receivable:    
Accounts receivable 16.7 10.8
Trade Accounts Receivable | BMI and LandWell    
Trade accounts receivable:    
Accounts receivable 2.7 1.2
Contran | Trade Items    
Trade accounts receivable:    
Receivable from affiliates 0.4 1.7
Other | Trade Items    
Trade accounts receivable:    
Receivable from affiliates $ 2.5 $ 2.8