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Segment Reporting - Segment Reporting (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Net sales $ 441.9 $ 443.4 $ 1,322.4 $ 1,378.6
Gross profit 116.7 124.1 365.0 406.7
Adjustment to fair value of contingent consideration 17.7 (0.7) 16.2 (2.1)
Restructuring charge 0.9 0.0 0.9 0.0
Impairment of property, plant and equipment 22.9 0.0 22.9 0.0
Impairment of intangible assets 19.1 0.0 19.1 0.0
Profit on disposal of property, plant and equipment 0.0 0.1 0.2 0.2
Operating income/(loss) 5.9 45.6 82.7 136.8
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Adjustment to fair value of contingent consideration 17.7 (0.7) 16.2 (2.1)
Restructuring charge (0.9) 0.0 (0.9) 0.0
Impairment of property, plant and equipment (22.9) 0.0 (22.9) 0.0
Impairment of intangible assets (19.1) 0.0 (19.1) 0.0
Profit on disposal of property, plant and equipment 0.0 0.1 0.2 0.2
Operating Segments [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 170.8 163.6 513.0 484.5
Gross profit 25.8 36.1 91.6 110.0
Operating income/(loss) 9.2 20.0 43.3 62.3
Operating Segments [Member] | Fuel Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales 172.0 165.8 507.4 509.3
Gross profit 61.2 55.7 184.9 173.9
Operating income/(loss) 35.3 30.9 107.6 94.7
Operating Segments [Member] | Oilfield Services [Member]        
Segment Reporting Information [Line Items]        
Net sales 99.1 114.0 302.0 384.8
Gross profit 29.7 32.3 88.5 122.8
Operating income/(loss) 4.8 7.1 15.1 31.3
Operating Segments [Member] | Personal Care [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 103.9 98.6 309.4 291.1
Operating Segments [Member] | Home Care [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 27.9 26.5 80.2 77.2
Operating Segments [Member] | Other [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 39.0 38.5 123.4 116.2
Operating Segments [Member] | Refinery and Performance [Member] | Fuel Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales 120.2 120.9 362.4 375.1
Operating Segments [Member] | Other [Member] | Fuel Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales 51.8 44.9 145.0 134.2
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Corporate costs $ (18.2) $ (11.8) $ (56.8) $ (49.6)