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Goodwill and other identifiable intangible assets
 3 Months Ended
Mar. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other identifiable intangible assets Goodwill and other identifiable intangible assets
Changes in goodwill during the first three months ended March 30, 2025, were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2025$25.9 $41.1 $67.0 
Exchange difference0.7 0.4 1.1 
Net balance at March 30, 2025$26.6 $41.5 $68.1 
Accumulated goodwill impairment losses in relation to continuing activities were $8.0 million as of March 30, 2025 and December 31, 2024.

Identifiable intangible assets consisted of the following:

In millionsCustomer relationshipsTechnology and trading relatedTotal
Cost:   
At January 1, 2025$15.6 $7.7 $23.3 
Exchange movements— 0.2 0.2 
At March 30, 2025$15.6 $7.9 $23.5 
Accumulated amortization:  
At January 1, 2025$7.0 $4.8 $11.8 
Provided during the period0.1 0.1 0.2 
Exchange movements— 0.1 0.1 
At March 30, 2025$7.1 $5.0 $12.1 
Net book values:  
At January 1, 2025$8.6 $2.9 $11.5 
At March 30, 2025$8.5 $2.9 $11.4 

Identifiable intangible asset amortization expense was $0.2 million for the First Quarters of 2025 and 2024 respectively.
Intangible asset amortization expense during each of the following five years is expected to be approximately $0.8 million.