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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Superform U.K. and U.S Aluminum 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)
Acquisition and disposal credit / (costs)			(2.0)
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	$ 0.0	$ 0.0	(2.6)
Acquisition and disposal credit / (costs)	0.4	0.2	$ (2.0)
Superform U.S Business | Discontinued operations, disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal related credit	$ 0.4	$ 0.2

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