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Segment Reporting and Geographical Area Data - Segment Reporting (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 1,476.9 | $ 1,306.8 | $ 883.4
Gross profit | 435.0 | 403.3 | 332.3
Restructuring charge | 7.1 | 0.0 | 0.0
Adjustment to fair value of contingent consideration | 0.0 | 0.0 | 9.4
Loss on disposal of subsidiary | 0.0 | (0.9) | (1.4)
Foreign exchange loss on liquidation of subsidiary | 0.0 | (1.8) | 0.0
Operating income | 133.5 | 125.0 | 98.2
Identifiable assets at year end | 1,473.4 | 1,410.2 | 1,181.4
Operating Segments [Member] | Fuel Specialties [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 574.5 | 523.8 | 509.6
Gross profit | 195.0 | 188.2 | 186.4
Operating income | 116.3 | 107.7 | 111.1
Identifiable assets at year end | 470.5 | 437.0 | 397.2
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 432.1 | 397.0 | 388.9
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 142.4 | 126.8 | 120.7
Operating Segments [Member] | Performance Chemicals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 468.1 | 419.5 | 138.7
Gross profit | 97.5 | 75.8 | 43.4
Operating income | 44.7 | 32.6 | 16.0
Identifiable assets at year end | 463.9 | 480.8 | 340.0
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 241.4 | 206.5 | 126.8
Operating Segments [Member] | Performance Chemicals [Member] | Home Care [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 109.1 | 103.4 | 2.0
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 117.6 | 109.6 | 9.9
Operating Segments [Member] | Oilfield Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 400.6 | 304.4 | 191.7
Gross profit | 130.4 | 109.3 | 76.4
Operating income | 22.1 | 9.5 | (4.7)
Identifiable assets at year end | 296.1 | 256.6 | 240.0
Operating Segments [Member] | Octane Additives [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 33.7 | 59.1 | 43.4
Gross profit | 12.1 | 30.0 | 26.1
Operating income | 9.9 | 26.7 | 22.7
Identifiable assets at year end | 39.6 | 41.7 | 38.1
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Corporate costs | (52.4) | (48.8) | (54.9)
Restructuring charge | (7.1) | 0.0 | 0.0
Identifiable assets at year end | 203.3 | 194.1 | 166.1
Segment Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on disposal of subsidiary | $ 0.0 | $ (0.9) | $ (1.4)

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