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Segment Reporting - Segment Reporting (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 435.0 | $ 480.4 | $ 935.2 | $ 990.0
Adjustment to fair value of contingent consideration | (0.6) | 0.0 | (1.4) | 0.0
Profit on disposal of property, plant and equipment | 0.0 | 0.0 | 0.1 | 0.0
Operating income/(loss) | 40.7 | 34.2 | 91.2 | 75.2
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjustment to fair value of contingent consideration | (0.6) | 0.0 | (1.4) | 0.0
Profit on disposal of property, plant and equipment | 0.0 | 0.0 | 0.1 | 0.0
Operating Segments [Member] | Performance Chemicals [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 160.1 | 127.8 | 320.9 | 279.2
Operating income/(loss) | 21.2 | 9.2 | 42.3 | 19.6
Operating Segments [Member] | Fuel Specialties [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 166.6 | 154.2 | 343.5 | 344.5
Operating income/(loss) | 30.4 | 17.1 | 63.8 | 49.5
Operating Segments [Member] | Oilfield Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 108.3 | 198.4 | 270.8 | 366.3
Operating income/(loss) | 7.3 | 28.0 | 24.2 | 43.9
Operating Segments [Member] | Personal Care [Member] | Performance Chemicals [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 97.7 | 78.6 | 192.5 | 166.8
Operating Segments [Member] | Home Care [Member] | Performance Chemicals [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 24.3 | 19.7 | 50.7 | 43.4
Operating Segments [Member] | Other [Member] | Performance Chemicals [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 38.1 | 29.5 | 77.7 | 69.0
Operating Segments [Member] | Refinery and Performance [Member] | Fuel Specialties [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 109.1 | 119.1 | 254.2 | 268.6
Operating Segments [Member] | Other [Member] | Fuel Specialties [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 57.5 | 35.1 | 89.3 | 75.9
Corporate, Non-Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Corporate costs | $ (17.6) | $ (20.1) | $ (37.8) | $ (37.8)

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