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Other Intangible Assets (Tables)
 6 Months Ended
Jun. 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
      0.1  
  
 
 
  
Gross cost at June 30
      294.9  
  
 
 
  
Accumulated amortization at January 1
      (181.3 ) 
Amortization expense
      (11.5 ) 
Impairment
      (19.8 ) 
Exchange effect
      0.0  
  
 
 
  
Accumulated amortization at June 30
      (212.6 ) 
  
 
 
  
Net book amount at June 30
    $ 82.3  
  
 
 
  
Schedule of Amortization Expense
The net book amount by category of other intangible assets is shown in the following table:
 
(in millions)
   
June 30

2020
     
December 31

2019
  
Product rights
    $ 8.2      $ 10.1  
Brand names
      2.6        2.9  
Technology
      20.9        32.6  
Customer relationships
      45.8        60.8  
Internally developed software
      4.8        7.1  
  
 
 
     
 
 
  
   $ 82.3      $ 113.5