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Inventories (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Inventories [Line Items]    
Reserve for obsolete and slow moving inventory $ 2,000,000 $ 3,000,000
Foreign inventories 203,000,000 178,000,000
U.S. inventories, LIFO basis 98,000,000 83,000,000
LIFO inventories below replacement cost 65,000,000 49,000,000
Increase in net income due to effect of liquidation 300,000  
Petroleum Additives [Member]
    
Inventories [Line Items]    
Increase in net income due to effect of liquidation 200,000  
Tetraethyl Lead (TEL) [Member]
    
Inventories [Line Items]    
Increase in net income due to effect of liquidation $ 100,000 $ 200,000