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Other Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Other Intangible Assets
The following table summarizes the other intangible assets movements:
 
         
(in millions)
  
2021
 
Gross cost at January 1
   $
298.9
 
Exchange effect
    
(2.8
    
 
 
 
Gross cost at September 30
    
296.1
 
    
 
 
 
Accumulated amortization at January 1
    
(223.6
Amortization expense
    
(12.0
Exchange effect
    
1.4
 
    
 
 
 
Accumulated amortization at September 30
    
(234.2
    
 
 
 
Net book amount at September 30
   $
61.9
 
    
 
 
 
Schedule of Category of Other Intangible Assets
The net book amount by category of other intangible assets is shown in the following table:
 
                 
(in millions)
  
September 30

2021
    
December 31

2020
 
Product rights
   $
3.5
     $
6.3
 
Brand names
    
1.8
      
2.3
 
Technology
    
18.0
      
19.8
 
Customer relationships
    
36.9
      
44.2
 
Internally developed software
    
1.7
      
2.7
 
    
 
 
    
 
 
 
     $
61.9
     $
75.3