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Segment Reporting - Segment Reporting (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Net sales $ 265.1 $ 371.9 $ 882.3 $ 1,122.6
Gross profit/(loss) 78.7 119.1 251.7 348.0
Restructuring charge (0.0) (0.0) (21.1) (0.0)
Impairment of intangible assets (0.0) (0.0) (19.8) (0.0)
Operating income/(loss) 16.8 38.2 4.3 106.1
Operating Segments [Member] | Fuel Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales 120.0 144.1 374.4 433.4
Gross profit/(loss) 40.3 54.1 116.9 154.5
Operating income/(loss) 22.2 31.1 59.0 88.1
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member]        
Segment Reporting Information [Line Items]        
Net sales 86.8 96.5 270.3 309.0
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net sales 33.2 47.6 104.1 124.4
Operating Segments [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 102.0 99.9 310.8 322.7
Gross profit/(loss) 24.0 22.6 76.5 73.2
Operating income/(loss) 12.4 9.3 40.2 33.8
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member]        
Segment Reporting Information [Line Items]        
Net sales 57.1 55.0 169.9 170.9
Operating Segments [Member] | Performance Chemicals [Member] | Home Care [Member]        
Segment Reporting Information [Line Items]        
Net sales 21.6 21.1 64.5 71.2
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net sales 23.3 23.8 76.4 80.6
Operating Segments [Member] | Oilfield Services [Member]        
Segment Reporting Information [Line Items]        
Net sales 43.1 121.4 197.1 358.1
Gross profit/(loss) 14.4 41.2 60.5 120.4
Operating income/(loss) (4.5) 10.0 (9.7) 27.9
Operating Segments [Member] | Octane Additives [Member]        
Segment Reporting Information [Line Items]        
Net sales 0.0 6.5 0.0 8.4
Gross profit/(loss) 0.0 1.2 (2.2) (0.1)
Operating income/(loss) 0.0 0.8 (2.8) (1.9)
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Corporate costs (13.3) (13.0) (41.5) (41.8)
Restructuring charge (0.0) (0.0) (21.1) (0.0)
Impairment of intangible assets $ (0.0) $ (0.0) $ (19.8) $ (0.0)