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Goodwill and other identifiable intangible assets (Tables)
 6 Months Ended
Jun. 26, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in goodwill during the first half ended June 26, 2022, were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2022$27.6 $42.1 $69.7 
Exchange difference(2.1)(1.3)(3.4)
Net balance at June 26, 2022$25.5 $40.8 $66.3 
Schedule of Intangible Assets
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— (0.6)(0.6)
At June 26, 202215.2 7.6 22.8 
Accumulated amortization:  
At January 1, 20225.7 4.0 9.7 
Provided during the period0.2 0.2 0.4 
Exchange movements— (0.3)(0.3)
At June 26, 20225.9 3.9 9.8 
Net book values:  
At January 1, 20229.5 4.2 13.7 
At June 26, 20229.3 3.7 13.0