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Goodwill and other identifiable intangible assets (Tables)
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in goodwill during the years ended December 31, 2022 and 2021 were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2021$27.9 $42.3 $70.2 
Exchange difference(0.3)(0.2)(0.5)
At December 31, 202127.6 42.1 69.7 
Exchange difference(2.6)(1.5)(4.1)
Net balance at December 31, 2022$25.0 $40.6 $65.6 
Schedule of Intangible Assets
Changes in the gross value of identifiable intangible assets during the year ended December 31, 2022, were as follows:
In millionsCustomer relationshipsTechnology and trading relatedTotal
At January 1, 2021$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 
Exchange movements— (0.8)(0.8)
At December 31, 2022$15.2 $7.4 $22.6 
Identifiable intangible assets consisted of the following:
December 31, 2022December 31, 2021
In millionsGrossAccumulated amortizationNetGrossAccumulated amortizationNet
Customer relationships$15.2 $(6.1)$9.1 $15.2 $(5.7)$9.5 
Technology and trading related7.4 (4.0)3.4 8.2 (4.0)4.2 
Total identifiable intangibles$22.6 $(10.1)$12.5 $23.4 $(9.7)$13.7