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Goodwill and other identifiable intangible assets
 6 Months Ended
Jun. 26, 2022
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 26, 2022, were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2022$27.6 $42.1 $69.7 
Exchange difference(2.1)(1.3)(3.4)
Net balance at June 26, 2022$25.5 $40.8 $66.3 
Accumulated goodwill impairment losses in relation to continuing activities were $8.0 million as of June 26, 2022 and December 31, 2021.

Identifiable intangible assets consisted of the following:

 Customer relationshipsTechnology and trading relatedTotal
$M$M$M
Cost:   
At January 1, 202215.2 8.2 23.4 
Exchange movements— (0.6)(0.6)
At June 26, 202215.2 7.6 22.8 
Accumulated amortization:  
At January 1, 20225.7 4.0 9.7 
Provided during the period0.2 0.2 0.4 
Exchange movements— (0.3)(0.3)
At June 26, 20225.9 3.9 9.8 
Net book values:  
At January 1, 20229.5 4.2 13.7 
At June 26, 20229.3 3.7 13.0 

Identifiable intangible asset amortization expense was $0.4 million and $0.4 million for the first half of 2022 and 2021 respectively.
Intangible asset amortization expense in 2022 and each of the following four years is expected to be approximately $1.0 million.