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Segment Reporting and Geographical Area Data - Segment Reporting (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 883.4 | $ 1,012.3 | $ 960.9
Gross profit | 332.3 | 346.0 | 302.0
Operating income | 105.4 | 156.3 | 112.5
Adjustment to fair value of contingent consideration | 9.4 | 40.7 | 1.9
Identifiable assets at year end | 1,181.4 | 1,028.6 | 999.9
(Loss)/profit on disposal of subsidiary | (1.4) | 1.6 | 0.0
Operating Segments [Member] | Fuel Specialties [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 509.6 | 532.8 | 566.8
Gross profit | 186.4 | 176.0 | 170.8
Operating income | 110.6 | 102.1 | 94.2
Identifiable assets at year end | 397.2 | 408.9 | 408.2
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 388.9 | 408.0 | 440.2
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 120.7 | 124.8 | 126.6
Operating Segments [Member] | Performance Chemicals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 138.7 | 155.0 | 177.6
Gross profit | 43.4 | 42.4 | 43.7
Operating income | 16.0 | 16.3 | 17.8
Identifiable assets at year end | 340.0 | 120.2 | 156.6
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 126.8 | 119.6 | 106.1
Operating Segments [Member] | Performance Chemicals [Member] | Fragrances [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0.1 | 23.0 | 56.2
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 11.8 | 12.4 | 15.3
Operating Segments [Member] | Oilfield Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 191.7 | 265.0 | 161.3
Gross profit | 76.4 | 99.1 | 58.9
Operating income | (4.7) | 9.0 | 18.0
Identifiable assets at year end | 240.0 | 240.9 | 293.1
Operating Segments [Member] | Octane Additives [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 43.4 | 59.5 | 55.2
Gross profit | 26.1 | 28.5 | 28.6
Operating income | 22.7 | 24.7 | 22.6
Identifiable assets at year end | 38.1 | 28.7 | 29.2
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Pension credit/(charge) | 6.7 | 0.2 | (3.3)
Corporate costs | (53.9) | (38.3) | (38.7)
Identifiable assets at year end | 166.1 | 229.9 | 112.8
Segment Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
(Loss)/profit on disposal of subsidiary | $ (1.4) | $ 1.6 | $ 0.0

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