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Accounts and other receivables, net - Components of Accounts and Other Receivables (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Trade accounts receivable:    
VAT and other receivables $ 42.2 $ 23.9
Allowance for doubtful accounts (1.5) (1.7)
Total 283.9 284.3
Kronos Worldwide, Inc. [Member]
   
Trade accounts receivable:    
Accounts receivable 229.7 247.2
CompX [Member]
   
Trade accounts receivable:    
Accounts receivable 8.7 14.6
WCS [Member]
   
Trade accounts receivable:    
Accounts receivable $ 4.8 $ 0.3