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Segment Reporting - Segment Reporting (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Net sales $ 376.1 $ 265.1 $ 1,070.2 $ 882.3
Gross profit/(loss) 112.9 78.7 322.0 251.7
Restructuring charge (0.0) (0.0) (0.0) (21.1)
Operating income/(loss) 31.4 16.8 96.6 4.3
Impairment of intangible assets (0.0) (0.0) (0.0) (19.8)
Fuel Specialties [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net sales       104.1
Operating Segments [Member] | Fuel Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales 156.4 120.0 438.8 374.4
Gross profit/(loss) 49.1 40.3 144.1 116.9
Operating income/(loss) 26.6 22.2 78.9 59.0
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member]        
Segment Reporting Information [Line Items]        
Net sales 113.8 86.8 307.9 270.3
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net sales 42.6 33.2 130.9  
Operating Segments [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 132.8 102.0 386.9 310.8
Gross profit/(loss) 32.6 24.0 95.6 76.5
Operating income/(loss) 17.8 12.4 54.0 40.2
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member]        
Segment Reporting Information [Line Items]        
Net sales 75.8 57.1 217.8 169.9
Operating Segments [Member] | Performance Chemicals [Member] | Home Care [Member]        
Segment Reporting Information [Line Items]        
Net sales 24.4 21.6 68.7 64.5
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net sales 32.6 23.3 100.4 76.4
Operating Segments [Member] | Oilfield Services [Member]        
Segment Reporting Information [Line Items]        
Net sales 86.9 43.1 244.5 197.1
Gross profit/(loss) 31.2 14.4 82.3 60.5
Operating income/(loss) 2.7 (4.5) 6.1 (9.7)
Operating Segments [Member] | Octane Additives [Member]        
Segment Reporting Information [Line Items]        
Gross profit/(loss) 0.0 0.0 0.0 (2.2)
Operating income/(loss)     0.0 (2.8)
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Corporate costs $ (15.7) $ (13.3) $ (42.4) $ (41.5)