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Noncontrolling Interest in Subsidiaries (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Noncontrolling Interest In Subsidiaries    
Noncontrolling interest in subsidiaries $ 353.1 $ 335.8
Kronos [Member]
   
Noncontrolling Interest In Subsidiaries    
Noncontrolling interest in subsidiaries 265.4 240.2
NL Industries Inc [Member]
   
Noncontrolling Interest In Subsidiaries    
Noncontrolling interest in subsidiaries 76.6 84.6
CompX [Member]
   
Noncontrolling Interest In Subsidiaries    
Noncontrolling interest in subsidiaries $ 11.1 $ 11.0