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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of Goodwill      
At January 1, Gross cost $ 375.5 $ 375.6  
At January 1, Accumulated impairment losses (234.0) (232.0)  
At January 1, Net book amount 141.5 143.6  
Exchange effect 0 (0.1)  
Acquisitions 8.7    
Impairment of Octane Additives segment goodwill (1.2) (2.0) (2.2)
At December 31, Gross cost 384.2 375.5 375.6
At December 31, Accumulated impairment losses (235.2) (234.0) (232.0)
At December 31, Net book amount 149.0 141.5 143.6
Fuel Specialties [Member]
      
Summary of Goodwill      
At January 1, Gross cost 108.8 108.9  
At January 1, Accumulated impairment losses 0 0  
At January 1, Net book amount 108.8 108.9  
Exchange effect 0.1 (0.1)  
Acquisitions 8.7    
Impairment of Octane Additives segment goodwill 0 0  
At December 31, Gross cost 117.6 108.8  
At December 31, Accumulated impairment losses 0 0  
At December 31, Net book amount 117.6 108.8  
Performance Chemicals [Member]
      
Summary of Goodwill      
At January 1, Gross cost 30.1 30.1  
At January 1, Accumulated impairment losses 0 0  
At January 1, Net book amount 30.1 30.1  
Exchange effect 0 0  
Acquisitions 0    
Impairment of Octane Additives segment goodwill 0 0  
At December 31, Gross cost 30.1 30.1  
At December 31, Accumulated impairment losses 0 0  
At December 31, Net book amount 30.1 30.1  
Octane Additives [Member]
      
Summary of Goodwill      
At January 1, Gross cost 236.6 236.6  
At January 1, Accumulated impairment losses (234.0) (232.0)  
At January 1, Net book amount 2.6 4.6  
Exchange effect (0.1) 0  
Acquisitions 0    
Impairment of Octane Additives segment goodwill (1.2) (2.0) (2.2)
At December 31, Gross cost 236.5 236.6 236.6
At December 31, Accumulated impairment losses (235.2) (234.0) (232.0)
At December 31, Net book amount $ 1.3 $ 2.6 $ 4.6