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Goodwill (Tables)
 3 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill
The following table summarizes the goodwill movements:
                         
(in millions)
 
Gross Cost
 
  
Accumulated
Impairment
Losses
 
  
Net Book
Amount
 
Opening balance at January 1
  $
599.5
     $
(236.5
 )   $
363.0
  
Exchange effect
   
(1.8
 )    
0.0
      
(1.8
 )
                         
Closing balance at March 31
  $
597.7
     $
(236.5
 )   $
361.2