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Noncontrolling Interest in Subsidiaries - Noncontrolling Interest in Net Income (Loss) of Subsidiaries (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income (loss) of subsidiaries $ (28.9) $ 62.3 $ 77.5
Kronos Worldwide, Inc.
      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income (loss) of subsidiaries (20.3) 42.6 62.6
NL
      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income (loss) of subsidiaries (9.4) 15.2 13.9
CompX
      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income (loss) of subsidiaries $ 0.8 $ 4.5 $ 1.0