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Segment Reporting and Geographical Area Data - Segment Reporting (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 1,193.1 | $ 1,513.3 | $ 1,476.9
Gross profit/(loss) | 342.7 | 466.2 | 435.0
Restructuring charge | (21.3) | (0.0) | (7.1)
Impairment of intangible assets | (19.8) | (0.0) | (0.0)
Operating income/(expense) | 33.7 | 149.9 | 133.5
Identifiable assets at year end | 1,397.4 | 1,468.8 | 1,473.4
Operating Segments [Member] | Fuel Specialties [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 512.7 | 583.7 | 574.5
Gross profit/(loss) | 160.3 | 204.5 | 195.0
Operating income/(expense) | 84.5 | 116.6 | 116.3
Identifiable assets at year end | 509.7 | 499.7 | 470.5
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 372.9 | 427.9 | 432.1
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 139.8 | 155.8 | 142.4
Operating Segments [Member] | Performance Chemicals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 425.4 | 428.7 | 468.1
Gross profit/(loss) | 103.8 | 100.1 | 97.5
Operating income/(expense) | 54.8 | 48.7 | 44.7
Identifiable assets at year end | 391.5 | 383.3 | 463.9
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 231.4 | 228.0 | 241.4
Operating Segments [Member] | Performance Chemicals [Member] | Home Care [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 87.0 | 93.4 | 109.1
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 107.0 | 107.3 | 117.6
Operating Segments [Member] | Oilfield Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 255.0 | 479.9 | 400.6
Gross profit/(loss) | 80.8 | 159.9 | 130.4
Operating income/(expense) | (9.5) | 39.7 | 22.1
Identifiable assets at year end | 210.8 | 316.8 | 296.1
Operating Segments [Member] | Octane Additives [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0.0 | 21.0 | 33.7
Gross profit/(loss) | (2.2) | 1.7 | 12.1
Operating income/(expense) | (2.8) | (0.7) | 9.9
Identifiable assets at year end | 0.0 | 24.2 | 39.6
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Corporate costs | (52.2) | (54.4) | (52.4)
Restructuring charge | (21.3) | (0.0) | (7.1)
Impairment of intangible assets | (19.8) | (0.0) | (0.0)
Identifiable assets at year end | $ 285.4 | $ 244.8 | $ 203.3

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