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Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Trade accounts receivable:    
VAT and other receivables $ 40.4 $ 42.2
Refundable income taxes 6.1 18.3
Allowance for doubtful accounts (1.4) (1.5)
Total 352.0 302.5
Contran | trade items
    
Trade accounts receivable:    
Receivable from affiliates: Contran - trade items 0.2 0.3
Kronos Worldwide, Inc.
    
Trade accounts receivable:    
Accounts receivable 276.5 229.7
CompX
    
Trade accounts receivable:    
Accounts receivable 10.8 8.7
WCS
    
Trade accounts receivable:    
Accounts receivable 1.3 4.8
Lpc | trade items
    
Trade accounts receivable:    
Receivable from affiliates: LPC - trade items $ 18.1