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Segmental Reporting (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Performance of segments based on operating income        
Net sales $ 178.5 $ 186.5 $ 379.3 $ 371.8
Gross profit 56.7 58.1 120.7 110.9
Pension credit/(charge) 0.1 (0.1) 0.2 (0.2)
Corporate costs (7.8) (6.5) (16.4) (14.0)
Restructuring charge 0 0 (0.1) 0
Impairment of Octane Additives segment goodwill (0.3) (0.5) (0.6) (1.1)
Total operating income 24.1 22.4 55.3 46.3
Fuel Specialties [Member]
        
Performance of segments based on operating income        
Net sales 114.5 113.3 245.2 240.4
Gross profit 34.7 31.1 73.4 67.5
Total operating income 16.9 12.3 38.6 34.6
Active Chemicals [Member]
        
Performance of segments based on operating income        
Net sales 44.9 48.7 91.4 95.2
Gross profit 12.1 13.7 23.2 25.4
Total operating income 7.2 9.1 13.2 16.7
Octane Additives [Member]
        
Performance of segments based on operating income        
Net sales 19.1 24.5 42.7 36.2
Gross profit 9.9 13.3 24.1 18.0
Impairment of Octane Additives segment goodwill     (0.6) (1.1)
Total operating income $ 8.0 $ 8.1 $ 20.4 $ 10.3