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Discontinued Operations - Narrative (Details) $ in Millions	1 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) building	Dec. 31, 2020 USD ($) building	Dec. 31, 2019 USD ($)	Mar. 28, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/ loss on disposition			$ 6.6	$ 0.0	$ 0.0
Impairment charges			1.5	0.0	5.2
Discontinued Operations, Disposed of by Sale | U.S Aluminum Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received		$ 20.2				$ 20.2
Gain/ loss on disposition		$ 7.1	7.1
Discontinued Operations, Disposed of by Sale | Superform U.K. Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received	$ 4.0
Gain/ loss on disposition	$ (0.5)
Discontinued Operations, Held-for-sale | Superform U.S Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges			$ 1.5	$ 0.0	$ 5.2
Held-for-sale | Elektron Segment | Building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties to be disposed | building			1	1
Amount of property to be disposed			$ 3.7	$ 3.7

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