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Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Other Intangible Assets
The following table analyzes other intangible assets movements in the year:
 
(in millions)
   
2022
  
Gross cost at January 1
    $ 295.2  
Exchange effect
      (3.6 ) 
    
 
 
  
Gross cost at June 30
      291.6  
    
 
 
  
Accumulated amortization at January 1
      (237.7 ) 
Amortization expense
      (7.8 ) 
Exchange effect
      2.0  
    
 
 
  
Accumulated amortization at June 30
      (243.5 ) 
    
 
 
  
Net book amount at June 30
    $ 48.1