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Goodwill and other identifiable intangible assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other identifiable intangible assets Goodwill and other identifiable intangible assets
Changes in goodwill during the years ended December 31, 2021 and 2020 were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2020$27.0 $41.8 $68.8 
Exchange difference0.9 0.5 1.4 
At December 31, 202027.9 42.3 70.2 
Exchange difference(0.3)(0.2)(0.5)
Net balance at December 31, 2021$27.6 $42.1 $69.7 
Accumulated goodwill impairment losses in relation to continuing activities were $8.0 million as of December 31, 2021 and 2020.
Changes in the gross value of identifiable intangible assets during the year ended December 31, 2021, were as follows:
In millionsCustomer relationshipsTechnology and trading relatedTotal
At January 1, 2020$13.4 $8.1 $21.5 
Exchange movements— 0.2 0.2 
At December 31, 2020$13.4 $8.3 $21.7 
Additions1.8 — 1.8 
Exchange movements— (0.1)(0.1)
At December 31, 2021$15.2 $8.2 $23.4 
Identifiable intangible assets consisted of the following:
December 31, 2021December 31, 2020
In millionsGrossAccumulated amortizationNetGrossAccumulated amortizationNet
Customer relationships$15.2 $(5.7)$9.5 $13.4 $(5.2)$8.2 
Technology and trading related8.2 (4.0)4.2 8.3 (3.7)4.6 
Total identifiable intangibles$23.4 $(9.7)$13.7 $21.7 $(8.9)$12.8 

Identifiable intangible asset amortization expense in 2021, 2020 and 2019 was $0.9 million, $0.7 million and $1.2 million, respectively.
Intangible asset amortization expense over the next five years is expected to be approximately $1.0 million per year.
The weighted-average amortization period for the customer relationships is 17 years and for the technology and trading related assets is 15 years.