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Goodwill (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill
The following table summarizes the goodwill movements:
 
         
(in millions)
  
Gross Cost
 
Opening balance at January 1, 2021
   $
371.2
 
Exchange effect
    
(5.2
    
 
 
 
Closing balance at September 30, 2021
   $
366.0