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Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Other Intangible Assets
Other intangible assets comprise the following:
 
(in millions)
   
2020
  
 
2019
Gross cost at January 1
   
$
 294.8  
 
$
294.6
 
Additions
 
 
0.0
 
 
 
1.1
 
Exchange effect
   
 
 4.1  
 
 
(0.9
) 
Gross cost at December 31
   
 
 298.9  
 
 
294.8
 
Accumulated amortization at January 1
   
 
 (181.3 ) 
 
 
(158.3
) 
Amortization expense
   
 
 (20.9 ) 
 
 
(23.0
) 
Impairment
   
 
 (19.8 ) 
 
 
0.0
 
Exchange effect
   
 
 (1.6 ) 
 
 
0.0
 
Accumulated amortization at December 31
   
 
 (223.6 ) 
 
 
(181.3
) 
Net book amount at December 31
   
$
 75.3  
 
$
113.5
 
Schedule of Amortization Expense
The net book amount by category of other intangible assets is shown in the following table:
 
(in millions)
   
December 31

2020
     
December 31

2019
  
Product rights
    $ 6.3      $ 10.1  
Brand names
      2.3        2.9  
Technology
      19.8        32.6  
Customer relationships
      44.2        60.8  
Internally developed software
      2.7        7.1  
    
 
 
     
 
 
  
     $ 75.3      $ 113.5  
    
 
 
     
 
 
  
Future amortization expense is estimated to be as follows for the next five years:
 
(in millions)
       
2021
    $ 15.9  
2022
    $ 14.3  
2023
    $ 10.9  
2024
    $ 10.2  
2025
    $ 7.2