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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
	Apr. 02, 2023	Mar. 27, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 2.3	$ 1.7
Cost of goods sold	(1.9)	(1.6)
Gross profit	0.4	0.1
Selling, general and administrative expenses	(0.3)	(0.2)
Restructuring charges	(0.1)	0.0
Operating profit / (loss)	0.0	(0.1)
Tax (charge) / credit	0.0	0.0
Net profit / (loss)	$ 0.0	$ (0.1)

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