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Goodwill
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Note 7.    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
.
 
 
The Company’s reporting units, the level at which goodwill is tested for impairment, are consistent with the reportable segments: Fuel Specialties, Performance Chemicals, Oilfield
 
Services and Octane Additives. The components in each segment (including products, markets and competitors) have similar economic characteristics and the segments, therefore, reflect the lowest level at which operations and cash flows can be clearly distinguished, operationally and for financial reporting purposes, from the rest of the Company.
The Company assesses goodwill for impairment on at least an annual basis, initially based on a qualitative assessment to determine whether it is more likely than not that the fair value of a segment is less than the carrying amount. If a potential impairment is identified then an impairment test is performed.
The Company performed its annual impairment assessment in respect of goodwill as at December 31, 2019, 2018 and 2017. Our impairment assessment concluded that there had been
no
impairment of goodwill in respect of those reporting units.
We believe that where appropriate the assumptions used in our impairment assessments are reasonable, but that they are judgmental, and variations in any of the assumptions may result in materially different calculations of any potential impairment charges.