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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 67.5
Exchange difference	(0.3)
Ending balance	67.2
Gas Cylinders
Goodwill [Roll Forward]
Beginning balance	26.2
Exchange difference	(0.2)
Ending balance	26.0
Elektron
Goodwill [Roll Forward]
Beginning balance	41.3
Exchange difference	(0.1)
Ending balance	$ 41.2

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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