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Goodwill - Summary of Goodwill (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Gross cost, beginning balance $ 599.5 $ 601.4
Accumulated impairment losses, beginning balance (236.5) (236.5)
Net book amount, beginning balance 363.0 364.9
Exchange effect 8.2 (1.9)
Gross cost, ending balance 371.2 599.5
Accumulated impairment losses, ending balance (0.0) (236.5)
Net book amount, ending balance 371.2 363.0
Fuel Specialties [Member]    
Goodwill [Line Items]    
Gross cost, beginning balance 207.7 207.9
Accumulated impairment losses, beginning balance (0.0) (0.0)
Net book amount, beginning balance 207.7 207.9
Exchange effect 0.2 (0.2)
Gross cost, ending balance 207.9 207.7
Accumulated impairment losses, ending balance (0.0) (0.0)
Net book amount, ending balance 207.9 207.7
Performance Chemicals [Member]    
Goodwill [Line Items]    
Gross cost, beginning balance 110.5 112.2
Accumulated impairment losses, beginning balance (0.0) (0.0)
Net book amount, beginning balance 110.5 112.2
Exchange effect 8.0 (1.7)
Gross cost, ending balance 118.5 110.5
Accumulated impairment losses, ending balance (0.0) (0.0)
Net book amount, ending balance 118.5 110.5
Oilfield Services [Member]    
Goodwill [Line Items]    
Gross cost, beginning balance 44.8 44.8
Accumulated impairment losses, beginning balance (0.0) (0.0)
Net book amount, beginning balance 44.8 44.8
Exchange effect 0.0 0.0
Gross cost, ending balance 44.8 44.8
Accumulated impairment losses, ending balance (0.0) (0.0)
Net book amount, ending balance 44.8 44.8
Octane Additives [Member]    
Goodwill [Line Items]    
Gross cost, beginning balance 236.5 236.5
Accumulated impairment losses, beginning balance (236.5) (236.5)
Net book amount, beginning balance 0.0 0.0
Exchange effect 0.0 0.0
Gross cost, ending balance 0.0 236.5
Accumulated impairment losses, ending balance (0.0) (236.5)
Net book amount, ending balance $ 0.0 $ 0.0