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Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Other Intangible Assets
The following table summarizes the other intangible assets movements:
 
(in millions)
   
2020
  
Gross cost at January 1
    $ 294.8  
Exchange effect
      2.0  
  
 
 
  
Gross cost at September 30
      296.8  
  
 
 
  
Accumulated amortization at January 1
      (181.3 ) 
Amortization expense
      (16.3 ) 
Impairment
      (19.8 ) 
Exchange effect
      (0.8 ) 
  
 
 
  
Accumulated amortization at September 30
      (218.2 ) 
  
 
 
  
Net book amount at September 30
    $ 78.6  
  
 
 
  
Schedule of Amortization Expense
The net book amount by category of other intangible assets is shown in the following table:
 
(in millions)
   
September 30

2020
     
December 31

2019
  
Product rights
    $ 7.2      $ 10.1  
Brand names
      2.5        2.9  
Technology
      20.3        32.6  
Customer relationships
      45.1        60.8  
Internally developed software
      3.5        7.1  
  
 
 
     
 
 
  
   $ 78.6      $ 113.5