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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 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

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.

+ References

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X

- 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.

+ References

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Details

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X

- Details

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