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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance	$ 65.6	$ 69.7
Exchange difference	1.9	(4.1)
Ending balance	67.5	65.6
Gas Cylinders
Goodwill [Roll Forward]
Beginning balance	25.0	27.6
Exchange difference	1.2	(2.6)
Ending balance	26.2	25.0
Elektron
Goodwill [Roll Forward]
Beginning balance	40.6	42.1
Exchange difference	0.7	(1.5)
Ending balance	$ 41.3	$ 40.6

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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