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Goodwill and other identifiable intangible assets
 6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other identifiable intangible assets Goodwill and other identifiable intangible assets
Changes in goodwill during the first half ended June 30, 2024, were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2024$26.2 $41.3 $67.5 
Exchange difference(0.2)(0.1)(0.3)
Net balance at June 30, 2024$26.0 $41.2 $67.2 
Accumulated goodwill impairment losses in relation to continuing activities were $8.0 million as of June 30, 2024 and December 31, 2023.

Identifiable intangible assets consisted of the following:

In millionsCustomer relationshipsTechnology and trading relatedTotal
Cost:   
At January 1 and June 30, 2024$15.2 $7.8 $23.0 
Accumulated amortization:  
At January 1, 2024$6.6 $4.4 $11.0 
Charge0.2 0.2 0.4 
At June 30, 2024$6.8 $4.6 $11.4 
Net book values:  
At January 1, 2024$8.6 $3.4 $12.0 
At June 30, 2024$8.4 $3.2 $11.6 

Identifiable intangible asset amortization expense was $0.4 million and $0.4 million for the first half of 2024 and 2023 respectively.
Intangible asset amortization expense during each of the following five years is expected to be approximately $0.8 million per year.