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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Beginning balance	$ 67.0	$ 67.5
Exchange difference	2.6	(0.5)
Ending balance	69.6	67.0
Gas Cylinders
Goodwill [Roll Forward]
Beginning balance	25.9	26.2
Exchange difference	1.6	(0.3)
Ending balance	27.5	25.9
Elektron
Goodwill [Roll Forward]
Beginning balance	41.1	41.3
Exchange difference	1.0	(0.2)
Ending balance	$ 42.1	$ 41.1

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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