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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

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