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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)

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