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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Beginning balance	$ 69.7	$ 70.2
Exchange difference	(4.1)	(0.5)
Ending balance	65.6	69.7
Gas Cylinders
Goodwill [Roll Forward]
Beginning balance	27.6	27.9
Exchange difference	(2.6)	(0.3)
Ending balance	25.0	27.6
Elektron
Goodwill [Roll Forward]
Beginning balance	42.1	42.3
Exchange difference	(1.5)	(0.2)
Ending balance	$ 40.6	$ 42.1

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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