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Restructuring charges - Restructuring Charges (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] |  |  |
Total restructuring charges | $ (1.9) | $ (6.2) | $ (8.9)
Gas Cylinders Segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | (1.7) | (5.3) | (7.9)
Elektron Segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | (0.2) | (0.9) | (0.9)
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | $ 0.0 | $ 0.0 | $ (0.1)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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