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Other Intangible Assets (Tables)
3 Months Ended
Mar. 31, 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 effec
t
     (2.0
    
 
 
 
Gross cost at March 31
     296.9  
    
 
 
 
Accumulated amortization at January 1
     (223.6
Amortization expense
     (4.0
Exchange effect
     0.9  
    
 
 
 
Accumulated amortization at March 31
     (226.7
    
 
 
 
Net book amount at March 31
   $ 70.2  
    
 
 
 
Schedule of Amortization Expense
The net book amount by category of other intangible assets is shown in the following table:
 
(in millions)
  
March 31

2021
    
December 31

2020
 
Product rights
   $ 5.3      $ 6.3  
Brand names
     2.2        2.3  
Technology
     19.2        19.8  
Customer relationships
     41.2        44.2  
Internally developed software
     2.3        2.7  
    
 
 
    
 
 
 
     $ 70.2      $ 75.3