v3.25.2
Segment Reporting - Segment Reporting (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Net sales $ 439.7 $ 435.0 $ 880.5 $ 935.2
Gross profit 123.2 126.9 248.3 282.6
Adjustment to fair value of contingent consideration (0.8) (0.6) (1.5) (1.4)
Profit on disposal of property, plant and equipment 0.1 0.0 0.2 0.1
Operating income/(loss) 34.3 40.7 76.8 91.2
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Adjustment to fair value of contingent consideration (0.8) (0.6) (1.5) (1.4)
Profit on disposal of property, plant and equipment 0.1 0.0 0.2 0.1
Operating Segments [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 173.8 160.1 342.2 320.9
Gross profit 30.5 36.2 65.8 73.9
Operating income/(loss) 14.3 21.2 34.1 42.3
Operating Segments [Member] | Fuel Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales 165.1 166.6 335.4 343.5
Gross profit 62.9 57.6 123.7 118.2
Operating income/(loss) 35.4 30.4 72.3 63.8
Operating Segments [Member] | Oilfield Services [Member]        
Segment Reporting Information [Line Items]        
Net sales 100.8 108.3 202.9 270.8
Gross profit 29.8 33.1 58.8 90.5
Operating income/(loss) 6.2 7.3 10.3 24.2
Operating Segments [Member] | Personal Care [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 105.0 97.7 205.5 192.5
Operating Segments [Member] | Home Care [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 26.1 24.3 52.4 50.7
Operating Segments [Member] | Other [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 42.7 38.1 84.3 77.7
Operating Segments [Member] | Refinery and Performance [Member] | Fuel Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales 112.8 109.1 242.2 254.2
Operating Segments [Member] | Other [Member] | Fuel Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales 52.3 57.5 93.2 89.3
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Corporate costs $ (20.9) $ (17.6) $ (38.6) $ (37.8)