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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/ loss on disposition			$ 0.0	$ 6.6	$ 0.0
Impairment charges			0.0	1.5	0.0
Discontinued operations, disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/ loss on disposition		$ 6.6
Discontinued operations, held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition and disposal costs			(2.0)
U.S Aluminum Business | Discontinued operations, disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received		20.2
Gain/ loss on disposition		$ 7.1
Superform U.K. Business | Discontinued operations, disposed of by sale
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)
Superform U.S Business | Discontinued operations, held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges			2.6	1.5	0.0
Acquisition and disposal costs			(2.0)	0.0	$ 0.0
Held-for-sale | Elektron Segment | Land and Building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of property to be disposed			$ 1.2
Held-for-sale | Elektron Segment | Building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of property to be disposed				$ 3.7

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