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Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Trade accounts receivable:    
VAT and other receivables $ 18.7 $ 32.7
Refundable income taxes 3.3 5.7
Accrued insurance recovery related to litigation 15.6 15.0
Allowance for doubtful accounts (2.1) (1.3)
Total 420.9 352.6
Trade Accounts Receivable | Kronos Worldwide, Inc.    
Trade accounts receivable:    
Accounts receivable 372.5 273.3
Trade Accounts Receivable | CompX    
Trade accounts receivable:    
Accounts receivable 15.0 12.2
Trade Accounts Receivable | BMI and LandWell    
Trade accounts receivable:    
Accounts receivable 0.8 1.5
Contran | Trade Items    
Trade accounts receivable:    
Receivable from affiliates 0.5 0.5
LPC | Trade Items    
Trade accounts receivable:    
Receivable from affiliates 10.2 10.2
Other | Trade Items    
Trade accounts receivable:    
Receivable from affiliates $ 2.0 $ 2.8