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Goodwill and other identifiable intangible assets
 6 Months Ended
Jul. 02, 2023
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 July 2, 2023, were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2023$25.0 $40.6 $65.6 
Exchange difference1.2 0.7 1.9 
Net balance at July 2, 2023$26.2 $41.3 $67.5 
Accumulated goodwill impairment losses in relation to continuing activities were $8.0 million as of July 2, 2023 and December 31, 2022.

Identifiable intangible assets consisted of the following:

In millionsCustomer relationshipsTechnology and trading relatedTotal
Cost:   
At January 1, 2023$15.2 $7.4 $22.6 
Exchange movements— 0.4 0.4 
At July 2, 2023$15.2 $7.8 $23.0 
Accumulated amortization:  
At January 1, 2023$6.1 $4.0 $10.1 
Charge0.2 0.2 0.4 
Exchange movements— 0.2 0.2 
At July 2, 2023$6.3 $4.4 $10.7 
Net book values:  
At January 1, 2023$9.1 $3.4 $12.5 
At July 2, 2023$8.9 $3.4 $12.3 

Identifiable intangible asset amortization expense was $0.4 million and $0.4 million for the first half of 2023 and 2022 respectively.
Intangible asset amortization expense in 2023 and each of the following four years is expected to be approximately $0.8 million per year.