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Goodwill and other identifiable intangible assets
 3 Months Ended
Apr. 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 three months ended April 2, 2023, were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2023$25.0 $40.6 $65.6 
Exchange difference0.6 0.3 0.9 
Net balance at April 2, 2023$25.6 $40.9 $66.5 
Accumulated goodwill impairment losses in relation to continuing activities were $8.0 million as of April 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— 0.2 0.2 
At April 2, 2023$15.2 $7.6 $22.8 
Accumulated amortization:  
At January 1, 2023$6.1 $4.0 $10.1 
Provided during the period0.1 0.1 0.2 
Exchange movements— 0.1 0.1 
At April 2, 2023$6.2 $4.2 $10.4 
Net book values:  
At January 1, 2023$9.1 $3.4 $12.5 
At April 2, 2023$9.0 $3.4 $12.4 

Identifiable intangible asset amortization expense was $0.2 million and $0.2 million for the First Quarters of 2023 and 2022 respectively.
Intangible asset amortization expense during each of the following five years is expected to be approximately $0.7 million.