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Goodwill and other identifiable intangible assets
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other identifiable intangible assets Goodwill and other identifiable intangible assets
Changes in goodwill during the years ended December 31, 2024 and 2023 were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2023$25.0 $40.6 $65.6 
Exchange difference1.2 0.7 1.9 
At December 31, 202326.2 41.3 67.5 
Exchange difference(0.3)(0.2)(0.5)
Net balance at December 31, 2024$25.9 $41.1 $67.0 
Accumulated goodwill impairment losses in relation to continuing operations were $8.0 million as of December 31, 2024 and 2023.
Changes in the gross value of identifiable intangible assets during the year ended December 31, 2024, were as follows:
In millionsCustomer relationshipsTechnology and trading relatedTotal
At January 1, 2023$15.2 $7.4 $22.6 
Exchange movements— 0.4 0.4 
At December 31, 2023$15.2 $7.8 $23.0 
Additions0.4 — 0.4 
Exchange movements— (0.1)(0.1)
At December 31, 2024$15.6 $7.7 $23.3 
Identifiable intangible assets consisted of the following:
December 31, 2024December 31, 2023
In millionsGrossAccumulated amortizationNetGrossAccumulated amortizationNet
Customer relationships$15.6 $(7.0)$8.6 $15.2 $(6.6)$8.6 
Technology and trading related7.7 (4.8)2.9 7.8 (4.4)3.4 
Total identifiable intangibles$23.3 $(11.8)$11.5 $23.0 $(11.0)$12.0 

Identifiable intangible asset amortization expense in 2024, 2023 and 2022 was $0.8 million, $0.8 million and $0.7 million, respectively.
Intangible asset amortization expense over the next five years is expected to be approximately $0.8 million per year.
The weighted-average amortization period for the customer relationships is 14 years and for the technology and trading related assets is 12 years.