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Goodwill and other identifiable intangible assets
 3 Months Ended
Mar. 27, 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 Quarter, ended March 27, 2022, were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2022$27.6 $42.1 $69.7 
Exchange difference(0.6)(0.2)(0.8)
Balance at March 27, 2022$27.0 $41.9 $68.9 

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— (0.1)(0.1)
At March 27, 202215.2 8.1 23.3 
Accumulated amortization:  
At January 1, 20225.7 4.0 9.7 
Provided during the year0.1 0.1 0.2 
At March 27, 20225.8 4.1 9.9 
Net book values:  
At January 1, 20229.5 4.2 13.7 
At March 27, 20229.4 4.0 13.4 

Identifiable intangible asset amortization expense was $0.2 million and $0.2 million for the First Quarters of 2022 and 2021 respectively.

Intangible asset amortization expense during the remainder of 2022 and over the next five years is expected to be approximately $0.8 million in 2022 and $1.0 million per year respectively.