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Restructuring charges - Restructuring Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ (1.9)	$ (6.2)	$ (8.9)
Gas Cylinders Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	(1.7)	(5.3)	(7.9)
Elektron Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	(0.2)	(0.9)	(0.9)
Other
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0.0	$ 0.0	$ (0.1)

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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