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Goodwill - Summary of Goodwill (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Gross cost, beginning balance $ 611.3 $ 503.9
Exchange effect 10.2  
Accumulated impairment losses, beginning balance (236.5) (236.5)
Measurement period adjustment (23.1)  
Net book amount, beginning balance 374.8 267.4
Additions   107.4
Gross cost, ending balance 598.3 611.3
Accumulated impairment losses, ending balance (236.5) (236.5)
Net book amount, ending balance 361.8 374.8
Fuel Specialties [Member]    
Goodwill [Line Items]    
Gross cost, beginning balance 207.9 207.9
Exchange effect 0.0  
Accumulated impairment losses, beginning balance 0.0 0.0
Measurement period adjustment 0.0  
Net book amount, beginning balance 207.9 207.9
Additions   0.0
Gross cost, ending balance 207.9 207.9
Accumulated impairment losses, ending balance 0.0 0.0
Net book amount, ending balance 207.9 207.9
Performance Chemicals [Member]    
Goodwill [Line Items]    
Gross cost, beginning balance 129.6 22.2
Exchange effect 10.2  
Accumulated impairment losses, beginning balance 0.0 0.0
Measurement period adjustment (23.1)  
Net book amount, beginning balance 129.6 22.2
Additions   107.4
Gross cost, ending balance 116.6 129.6
Accumulated impairment losses, ending balance 0.0 0.0
Net book amount, ending balance 116.6 129.6
Oilfield Services [Member]    
Goodwill [Line Items]    
Gross cost, beginning balance 37.3 37.3
Exchange effect 0.0  
Accumulated impairment losses, beginning balance 0.0 0.0
Measurement period adjustment 0.0  
Net book amount, beginning balance 37.3 37.3
Additions   0.0
Gross cost, ending balance 37.3 37.3
Accumulated impairment losses, ending balance 0.0 0.0
Net book amount, ending balance 37.3 37.3
Octane Additives [Member]    
Goodwill [Line Items]    
Gross cost, beginning balance 236.5 236.5
Exchange effect 0.0  
Accumulated impairment losses, beginning balance (236.5) (236.5)
Measurement period adjustment 0.0  
Net book amount, beginning balance 0.0 0.0
Additions   0.0
Gross cost, ending balance 236.5 236.5
Accumulated impairment losses, ending balance (236.5) (236.5)
Net book amount, ending balance $ 0.0 $ 0.0