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Restructuring charges - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.9	$ 6.2	$ 8.9
Severance costs			1.4
Gas Cylinders Segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1.7	5.0	7.5
Restructuring charges	1.7	5.3	7.9
Environmental remediation charge		1.0
Employee litigation claims		2.4
Severance costs			0.4
Gas Cylinders Segment | Other restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0.3
Elektron Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.2	0.9	0.9
Severance costs			0.9
Elektron Segment | One-time termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.2	0.9
Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.0	$ 0.0	0.1
Severance costs			$ 0.1

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Employee Litigation Claims

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The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of restructuring charges, remediation cost, and asset impairment loss.

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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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