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Discontinued Operations - Narrative (Details) - Held-for-sale $ in Millions	Dec. 31, 2020 USD ($) building	Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, plant and equipment	$ 11.6	$ 12.4
Gas Cylinders segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventory		$ 0.2
Freehold buildings | Elektron segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties to be disposed | building	1
Property, plant and equipment	$ 3.7

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