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Restructuring - Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0.5	$ 4.2	$ 2.1	$ 7.8
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs		4.2		7.8
Total restructuring charges	0.5	4.2	2.1	7.8
Gas Cylinders
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0.3	3.3	1.0	6.5
Gas Cylinders | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0.5	3.3	1.1	6.7
Elektron | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0.0	0.9	1.0	1.0
Other | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	$ 0.0	$ 0.0	$ 0.0	$ 0.1

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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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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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