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Segmental Reporting and Geographical Area Data - Segment Reporting (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Net sales $ 818.8 $ 776.4 $ 774.4
Gross profit 255.2 236.4 226.4
Operating income 90.6 96.5 47.2
Identifiable assets at year end 794.7 579.4 568.8
Restructuring charge (0.2) (0.2) (0.6)
Impairment of Octane Additives segment goodwill (1.3) (1.2) (2.0)
Profit on disposal, net 0 0.1 0
Fuel Specialties [Member]
      
Segment Reporting Information [Line Items]      
Identifiable assets at year end 446.4 356.6 281.5
Impairment of Octane Additives segment goodwill 0 0  
Performance Chemicals [Member]
      
Segment Reporting Information [Line Items]      
Identifiable assets at year end 176.8 113.4 106.7
Impairment of Octane Additives segment goodwill 0 0  
Octane Additives [Member]
      
Segment Reporting Information [Line Items]      
Identifiable assets at year end 42.0 48.9 51.5
Impairment of Octane Additives segment goodwill (1.3) (1.2) (2.0)
Operating Segments [Member] | Fuel Specialties [Member]
      
Segment Reporting Information [Line Items]      
Net sales 567.4 527.2 521.2
Gross profit 181.1 158.7 149.3
Operating income 92.7 87.6 81.7
Operating Segments [Member] | Performance Chemicals [Member]
      
Segment Reporting Information [Line Items]      
Net sales 192.4 179.6 177.0
Gross profit 46.3 43.8 40.6
Operating income 23.6 24.3 22.6
Operating Segments [Member] | Octane Additives [Member]
      
Segment Reporting Information [Line Items]      
Net sales 59.0 69.6 76.2
Gross profit 27.8 33.9 36.5
Operating income 21.5 26.0 (22.4)
Segment Reconciling Items [Member]
      
Segment Reporting Information [Line Items]      
Pension credit/(charge) (2.3) (1.6) (2.9)
Restructuring charge (0.2) (0.2) (0.6)
Impairment of Octane Additives segment goodwill (1.3) (1.2) (2.0)
Profit on disposal, net 0 0.1 0
Corporate, Non-Segment [Member]
      
Segment Reporting Information [Line Items]      
Identifiable assets at year end 128.8 60.5 129.1
Corporate costs $ (43.4) $ (38.5) $ (29.2)