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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)