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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill

The following table summarizes the goodwill movements in the year:

 

(in millions)

 

Gross Cost

 

Opening balance at January 1, 2023

 

$

358.8

 

Exchange effect

 

 

(0.9

)

Closing balance at September 30, 2023

 

$

357.9