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Restructuring charges - Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 27, 2022	Mar. 28, 2021
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 1.4	$ 1.4
Gas Cylinders segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	1.4	0.5
Elektron segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0.0	$ 0.9

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+ References

No definition available.

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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 http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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