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Segment Reporting and Geographical Area Data - Segment Reporting (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Net sales $ 1,845.4 $ 1,948.8 $ 1,963.7
Gross profit 542.9 591.1 586.7
Adjustment to fair value of contingent consideration (3.4) 0.0 0.0
Profit on disposal 0.2 0.0 0.0
Operating income/(expense) 177.9 161.6 187.3
Identifiable assets at year end 1,734.7 1,707.4 1,603.7
Oilfield Services [Member]      
Segment Reporting Information [Line Items]      
Net sales   265.2 222.2
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Adjustment to fair value of contingent consideration (3.4) 0.0 0.0
Profit on disposal 0.2 0.0 0.0
Operating Segments [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales 653.7 561.6 639.7
Gross profit 148.4 105.6 150.0
Operating income/(expense) 82.9 54.5 95.3
Identifiable assets at year end 598.3 580.1 610.4
Operating Segments [Member] | Fuel Specialties [Member]      
Segment Reporting Information [Line Items]      
Net sales 701.1 695.9 730.2
Gross profit 239.9 215.1 221.9
Operating income/(expense) 129.6 109.7 121.7
Identifiable assets at year end 553.8 529.2 500.6
Operating Segments [Member] | Oilfield Services [Member]      
Segment Reporting Information [Line Items]      
Net sales 490.6 691.3 593.8
Gross profit 154.6 270.4 214.8
Operating income/(expense) 38.8 78.6 41.7
Identifiable assets at year end 272.5 310.8 297.8
Operating Segments [Member] | Personal Care [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales 390.0 352.7 393.3
Operating Segments [Member] | Home Care [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales 106.6 86.8 94.2
Operating Segments [Member] | Other [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales 157.1 122.1 152.2
Operating Segments [Member] | Refinery and Performance [Member] | Fuel Specialties [Member]      
Segment Reporting Information [Line Items]      
Net sales 517.4 540.6 552.6
Operating Segments [Member] | Other [Member] | Fuel Specialties [Member]      
Segment Reporting Information [Line Items]      
Net sales 183.7 155.3 177.6
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Corporate costs (70.2) (81.2) (71.4)
Identifiable assets at year end $ 310.1 $ 287.3 $ 194.9