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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

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