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Marketable Securities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Classification of Marketable Securities    
Marketable securities $ 69.6 $ 98.4
Current marketable securities (See Note 2)   20.9
Cost Basis 89.3 89.3
Unrealized gains (losses) (19.7) 9.1
TIMET Common Stock [Member]
   
Classification of Marketable Securities    
Marketable securities 48.0 63.6
Cost Basis 73.9 73.9
Unrealized gains (losses) (25.9) (10.3)
NL and CompX Common Stocks [Member]
   
Classification of Marketable Securities    
Marketable securities 0.1 0.1
Cost Basis 0.1 0.1
Valhi Common Stock [Member]
   
Classification of Marketable Securities    
Marketable securities 21.5 34.7
Cost Basis 15.3 15.3
Unrealized gains (losses) 6.2 19.4
Mutual Funds [Member]
   
Classification of Marketable Securities    
Current marketable securities (See Note 2)   20.9
Cost Basis   21.1
Unrealized gains (losses)   $ (0.2)