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Segmental Reporting and Geographical Area Data (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segmental reporting      
Net sales $ 776.4 $ 774.4 $ 683.2
Gross profit 236.4 226.4 214.1
Pension credit/(charge) 0.3 (0.5) (10.8)
Corporate costs (38.5) (29.2) (26.3)
Restructuring charge (0.2) (0.6) (8.7)
Impairment of Octane Additives segment goodwill (1.2) (2.0) (2.2)
Profit on disposal, net 0.1 0 0.1
Operating income 98.4 49.6 72.2
Identifiable assets at year end 579.4 568.8 549.4
Fuel Specialties [Member]
      
Segmental reporting      
Net sales 527.2 521.2 458.1
Gross profit 158.7 149.3 145.9
Impairment of Octane Additives segment goodwill 0 0  
Operating income 87.6 81.7 77.6
Identifiable assets at year end 356.6 281.5 260.4
Performance Chemicals [Member]
      
Segmental reporting      
Net sales 179.6 177.0 152.7
Gross profit 43.8 40.6 33.3
Impairment of Octane Additives segment goodwill 0 0  
Operating income 24.3 22.6 16.7
Identifiable assets at year end 113.4 106.7 104.8
Octane Additives [Member]
      
Segmental reporting      
Net sales 69.6 76.2 72.4
Gross profit 33.9 36.5 34.9
Impairment of Octane Additives segment goodwill (1.2) (2.0) (2.2)
Operating income 26.0 (22.4) 25.8
Identifiable assets at year end 48.9 51.5 65.9
Corporate [Member]
      
Segmental reporting      
Identifiable assets at year end $ 60.5 $ 129.1 $ 118.3