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Discontinued Operations - Results of Discontinued Operations (Details) - Discontinued Operations, Held-for-sale - Superform Aluminum Superplastic - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 1.5	$ 2.3
Cost of goods sold	(1.1)	(1.9)
Gross profit	0.4	0.4
Selling, general and administrative expenses	(0.4)	(0.3)
Restructuring charges	(0.1)	(0.1)
Operating (loss) / profit	(0.1)	0.0
Tax credit / (charge)	0.0	0.0
Net (loss) / profit	$ (0.1)	$ 0.0

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