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Restructuring - Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0.2	$ 0.8	$ 1.6	$ 3.6
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs		0.8
Total restructuring charges	0.2	0.8	1.6	3.6
Gas Cylinders
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0.2	0.6	0.7
Gas Cylinders | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0.2	0.8	0.7	3.4
Elektron | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0.0	0.1	0.9	0.1
Other | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	$ 0.0	$ (0.1)	$ 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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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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