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Segment Reporting - Segment Reporting (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Net sales $ 244.9 $ 362.4 $ 617.2 $ 750.7
Gross profit/(loss) 59.1 111.1 173.0 228.9
Restructuring charge (21.1) (0.0) (21.1) (0.0)
Impairment of intangible assets (19.8) (0.0) (19.8) (0.0)
Operating income/(loss) (53.4) 31.7 (12.5) 67.9
Operating Segments [Member] | Fuel Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales 107.4 133.3 254.4 289.3
Gross profit/(loss) 25.4 44.7 76.6 100.4
Operating income/(loss) 4.7 24.1 36.8 57.0
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member]        
Segment Reporting Information [Line Items]        
Net sales 74.9 95.2 183.5 212.5
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net sales 32.5 38.1 70.9 76.8
Operating Segments [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 95.7 104.7 208.8 222.8
Gross profit/(loss) 24.9 24.0 52.5 50.6
Operating income/(loss) 12.2 11.0 27.8 24.5
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member]        
Segment Reporting Information [Line Items]        
Net sales 49.8 54.9 112.8 115.9
Operating Segments [Member] | Performance Chemicals [Member] | Home Care [Member]        
Segment Reporting Information [Line Items]        
Net sales 21.3 23.1 42.9 50.1
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net sales 24.6 26.7 53.1 56.8
Operating Segments [Member] | Oilfield Services [Member]        
Segment Reporting Information [Line Items]        
Net sales 41.8 122.5 154.0 236.7
Gross profit/(loss) 9.9 41.5 46.1 79.2
Operating income/(loss) (12.4) 10.1 (5.2) 17.9
Operating Segments [Member] | Octane Additives [Member]        
Segment Reporting Information [Line Items]        
Net sales 0.0 1.9 0.0 1.9
Gross profit/(loss) (1.1) 0.9 (2.2) (1.3)
Operating income/(loss) (1.6) 0.1 (2.8) (2.7)
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Corporate costs (15.4) (13.6) (28.2) (28.8)
Restructuring charge (21.1) (0.0) (21.1) (0.0)
Impairment of intangible assets $ (19.8) $ (0.0) $ (19.8) $ (0.0)