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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 25, 2022 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 69.7
Exchange difference	(7.2)
Ending balance	62.5
Gas Cylinders
Goodwill [Roll Forward]
Beginning balance	27.6
Exchange difference	(4.5)
Ending balance	23.1
Elektron
Goodwill [Roll Forward]
Beginning balance	42.1
Exchange difference	(2.7)
Ending balance	$ 39.4

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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