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Restructuring charges - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 1.9 | $ 6.2 | $ 8.9
Severance costs |  |  | 1.4
Gas Cylinders Segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 1.7 | 5.0 | 7.5
Restructuring charges | 1.7 | 5.3 | 7.9
Environmental remediation charge |  | 1.0 |
Employee litigation claims |  | 2.4 |
Severance costs |  |  | 0.4
Gas Cylinders Segment | Other restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  | 0.3 |
Elektron Segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 0.2 | 0.9 | 0.9
Severance costs |  |  | 0.9
Elektron Segment | One-time termination benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 0.2 | 0.9 |
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 0.0 | $ 0.0 | 0.1
Severance costs |  |  | $ 0.1

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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 55 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=6571209&loc=d3e13644-110860 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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