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Goodwill and other identifiable intangible assets
 12 Months Ended
Dec. 31, 2025
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, 2025 and 2024 were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2024$26.2 $41.3 $67.5 
Exchange difference(0.3)(0.2)(0.5)
At December 31, 202425.9 41.1 67.0 
Exchange difference1.6 1.0 2.6 
Net balance at December 31, 2025$27.5 $42.1 $69.6 
Accumulated goodwill impairment losses in relation to continuing operations were $8.0 million as of December 31, 2025 and 2024.
Changes in the gross value of identifiable intangible assets during the year ended December 31, 2025, were as follows:
In millionsCustomer relationshipsTechnology and trading relatedTotal
At January 1, 2024$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 
Exchange movements— 0.5 0.5 
At December 31, 2025$15.6 $8.2 $23.8 
Identifiable intangible assets consisted of the following:
December 31, 2025December 31, 2024
In millionsGrossAccumulated amortizationNetGrossAccumulated amortizationNet
Customer relationships$15.6 $(7.6)$8.0 $15.6 $(7.0)$8.6 
Technology and trading related8.2 (5.3)2.9 7.7 (4.8)2.9 
Total identifiable intangibles$23.8 $(12.9)$10.9 $23.3 $(11.8)$11.5 

Identifiable intangible asset amortization expense in 2025, 2024 and 2023 was $0.8 million, $0.8 million and $0.8 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 13 years and for the technology and trading related assets is 11 years.