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Segment Reporting and Geographical Area Data - Segment Reporting (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Net sales $ 1,778.0 $ 1,845.4 $ 1,948.8
Gross profit 492.4 542.9 591.1
Adjustment to fair value of contingent consideration 15.9 (3.4) 0.0
Restructuring charge 0.9 0.0 0.0
Impairment of property, plant and equipment 22.9 0.0 0.0
Impairment of intangible assets 19.1 0.0 0.0
Profit on disposal of property, plant and equipment 0.2 0.2 0.0
Operating income/(expense) 129.5 177.9 161.6
Identifiable assets at year end 1,832.4 1,734.7  
Oilfield Services [Member]      
Segment Reporting Information [Line Items]      
Net sales     265.2
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Adjustment to fair value of contingent consideration 15.9 (3.4) 0.0
Restructuring charge (0.9) 0.0 0.0
Impairment of property, plant and equipment (22.9) 0.0 0.0
Impairment of intangible assets (19.1) 0.0 0.0
Profit on disposal of property, plant and equipment 0.2 0.2 0.0
Operating Segments [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales 681.4 653.7 561.6
Gross profit 122.0 148.4 105.6
Operating income/(expense) 61.0 82.9 54.5
Identifiable assets at year end 602.0 598.3  
Operating Segments [Member] | Fuel Specialties [Member]      
Segment Reporting Information [Line Items]      
Net sales 701.5 701.1 695.9
Gross profit 252.2 239.9 215.1
Operating income/(expense) 144.8 129.6 109.7
Identifiable assets at year end 625.5 553.8  
Operating Segments [Member] | Oilfield Services [Member]      
Segment Reporting Information [Line Items]      
Net sales 395.1 490.6 691.3
Gross profit 118.2 154.6 270.4
Operating income/(expense) 23.3 38.8 78.6
Identifiable assets at year end 212.2 272.5  
Operating Segments [Member] | Personal Care [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales 409.2 390.0 352.7
Operating Segments [Member] | Home Care [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales 109.0 106.6 86.8
Operating Segments [Member] | Other [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales 163.2 157.1 122.1
Operating Segments [Member] | Refinery and Performance [Member] | Fuel Specialties [Member]      
Segment Reporting Information [Line Items]      
Net sales 509.4 517.4 540.6
Operating Segments [Member] | Other [Member] | Fuel Specialties [Member]      
Segment Reporting Information [Line Items]      
Net sales 192.1 183.7 155.3
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Corporate costs (72.8) (70.2) $ (81.2)
Identifiable assets at year end $ 392.7 $ 310.1