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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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- 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 + Details
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