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Goodwill and other identifiable intangible assets (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in goodwill during the years ended December 31, 2023 and 2022 were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2022$27.6 $42.1 $69.7 
Exchange difference(2.6)(1.5)(4.1)
At December 31, 202225.0 40.6 65.6 
Exchange difference1.2 0.7 1.9 
Net balance at December 31, 2023$26.2 $41.3 $67.5 
Schedule of Intangible Assets
Changes in the gross value of identifiable intangible assets during the year ended December 31, 2023, were as follows:
In millionsCustomer relationshipsTechnology and trading relatedTotal
At January 1, 2022$15.2 $8.2 $23.4 
Exchange movements— (0.8)(0.8)
At December 31, 2022$15.2 $7.4 $22.6 
Exchange movements— 0.4 0.4 
At December 31, 2023$15.2 $7.8 $23.0 
Identifiable intangible assets consisted of the following:
December 31, 2023December 31, 2022
In millionsGrossAccumulated amortizationNetGrossAccumulated amortizationNet
Customer relationships$15.2 $(6.6)$8.6 $15.2 $(6.1)$9.1 
Technology and trading related7.8 (4.4)3.4 7.4 (4.0)3.4 
Total identifiable intangibles$23.0 $(11.0)$12.0 $22.6 $(10.1)$12.5