Restructuring charges - Restructuring and related costs (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ (9.0)	$ (4.7)	$ (6.4)
Other restructuring
Restructuring Cost and Reserve [Line Items]
Severance costs	(2.5)	(1.9)	(3.2)
Asset impairments	(6.5)	(2.8)	(3.2)
Total restructuring charges	(9.0)	(4.7)	(6.4)
Gas Cylinders Segment \| Other restructuring
Restructuring Cost and Reserve [Line Items]
Severance costs	(2.1)	(1.7)	(2.9)
Asset impairments	(4.4)	(2.8)	(3.0)
Elektron Segment \| Other restructuring
Restructuring Cost and Reserve [Line Items]
Severance costs	(0.4)	(0.2)	(0.3)
Asset impairments	$ (2.1)	$ 0.0	$ (0.2)

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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