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Segment Reporting and Geographical Area Data - Segment Reporting (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Net sales $ 1,193.1 $ 1,513.3 $ 1,476.9
Gross profit/(loss) 342.7 466.2 435.0
Restructuring charge (21.3) (0.0) (7.1)
Impairment of intangible assets (19.8) (0.0) (0.0)
Operating income/(expense) 33.7 149.9 133.5
Identifiable assets at year end 1,397.4 1,468.8 1,473.4
Operating Segments [Member] | Fuel Specialties [Member]      
Segment Reporting Information [Line Items]      
Net sales 512.7 583.7 574.5
Gross profit/(loss) 160.3 204.5 195.0
Operating income/(expense) 84.5 116.6 116.3
Identifiable assets at year end 509.7 499.7 470.5
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member]      
Segment Reporting Information [Line Items]      
Net sales 372.9 427.9 432.1
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member]      
Segment Reporting Information [Line Items]      
Net sales 139.8 155.8 142.4
Operating Segments [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales 425.4 428.7 468.1
Gross profit/(loss) 103.8 100.1 97.5
Operating income/(expense) 54.8 48.7 44.7
Identifiable assets at year end 391.5 383.3 463.9
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member]      
Segment Reporting Information [Line Items]      
Net sales 231.4 228.0 241.4
Operating Segments [Member] | Performance Chemicals [Member] | Home Care [Member]      
Segment Reporting Information [Line Items]      
Net sales 87.0 93.4 109.1
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member]      
Segment Reporting Information [Line Items]      
Net sales 107.0 107.3 117.6
Operating Segments [Member] | Oilfield Services [Member]      
Segment Reporting Information [Line Items]      
Net sales 255.0 479.9 400.6
Gross profit/(loss) 80.8 159.9 130.4
Operating income/(expense) (9.5) 39.7 22.1
Identifiable assets at year end 210.8 316.8 296.1
Operating Segments [Member] | Octane Additives [Member]      
Segment Reporting Information [Line Items]      
Net sales 0.0 21.0 33.7
Gross profit/(loss) (2.2) 1.7 12.1
Operating income/(expense) (2.8) (0.7) 9.9
Identifiable assets at year end 0.0 24.2 39.6
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Corporate costs (52.2) (54.4) (52.4)
Restructuring charge (21.3) (0.0) (7.1)
Impairment of intangible assets (19.8) (0.0) (0.0)
Identifiable assets at year end $ 285.4 $ 244.8 $ 203.3