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Goodwill and other identifiable intangible assets (Tables)
 9 Months Ended
Oct. 01, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in goodwill during the first nine months ended October 1, 2023, were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2023$25.0 $40.6 $65.6 
Exchange difference0.2 0.2 0.4 
Net balance at October 1, 2023$25.2 $40.8 $66.0 
Schedule of Intangible Assets
Identifiable intangible assets consisted of the following:

In millionsCustomer relationshipsTechnology and trading relatedTotal
Cost:   
At January 1, 2023$15.2 $7.4 $22.6 
Exchange movements— 0.1 0.1 
At October 1, 2023$15.2 $7.5 $22.7 
Accumulated amortization:  
At January 1, 2023$6.1 $4.0 $10.1 
Charge0.3 0.3 0.6 
At October 1, 2023$6.4 $4.3 $10.7 
Net book values:  
At January 1, 2023$9.1 $3.4 $12.5 
At October 1, 2023$8.8 $3.2 $12.0