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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill
The following table analyzes goodwill movement for 2019 and 2018.
                                         
(
in millions
)
 
Fuel
Specialties
 
  
Performance
Chemicals
 
  
Oilfield
Services
 
  
Octane
Additives
 
  
Total
 
At December 31, 2017
   
     
     
     
     
 
Gross cost
(1)
   $
207.9
    $
116.6
    $
37.3
    $
236.5
    $
598.3
 
Accumulated impairment losses
   
0.0
     
0.0
     
0.0
     
(236.5
 )    
(236.5
 )
                                         
Net book amount
  $
207.9
    $
116.6
    $
37.3
    $
0.0
    $
361.8
 
                                         
Exchange effect
   
0.0
     
(4.4
 )    
0.0
     
0.0
     
(4.4
 )
Acquisition
   
0.0
     
0.0
     
7.5
     
0.0
     
7.5
 
At December 31, 2018
   
     
     
     
     
 
Gross cost
(1)
   $
207.9
    $
112.2
    $
44.8
    $
236.5
    $
601.4
 
Accumulated impairment losses
   
0.0
     
0.0
     
0.0
     
(236.5
 )    
(236.5
 )
                                         
Net book amount
  $
207.9
    $
112.2
    $
44.8
    $
0.0
    $
364.9
 
                                         
Exchange effect
   
(0.2
)    
(1.7
)    
0.0
     
0.0
     
(1.9
)
At December 31, 2019
   
     
     
     
     
 
Gross cost
(1)
   $
207.7
   
$
 
110.5
   
$
44.8
   
$
236.5
   
$
599.5
 
Accumulated impairment losses
   
0.0
     
0.0
     
0.0
     
(236.5
)    
(236.5
)
                                         
Net book amount
  $
207.7
   
$
110.5
   
$
44.8
   
$
0.0
   
$
363.0
 
                                         
 
 
 
 
 
 
 
 
 
 
 
 
(1)
Gross cost is net of $8.7
 million, $0.3
 million and $289.5
 million of historical accumulated amortization in respect of the Fuel Specialties, Performance Chemicals and Octane Additives reporting segments, respectively
.