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

The following table analyzes other intangible assets movements in the year:

 

(in millions)

 

2023

 

Gross cost at January 1

 

$

291.1

 

Additions

 

 

10.8

 

Exchange effect

 

 

(0.3

)

Gross cost at September 30

 

 

301.6

 

Accumulated amortization at January 1

 

 

(246.1

)

Amortization expense

 

 

(8.0

)

Exchange effect

 

 

0.3

 

Accumulated amortization at September 30

 

 

(253.8

)

Net book amount at September 30

 

$

47.8