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Discontinued Operations - Results of discontinued operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income / (loss)	$ 0.1	$ 0.2	$ (0.1)	$ 0.0
Discontinued Operations, Held-for-sale | Superform Aluminum Superplastic
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	1.6	1.9	4.7	6.1
Cost of goods sold	(1.1)	(1.4)	(3.6)	(5.0)
Gross profit	0.5	0.5	1.1	1.1
Selling, general and administrative expenses	(0.3)	(0.3)	(1.1)	(1.0)
Restructuring charge	0.0	0.1	(0.1)	(0.1)
Operating income / (loss)	0.2	0.3	(0.1)	0.0
Tax (charge) / credit	(0.1)	(0.1)	0.0	0.0
Net income / (loss)	$ 0.1	$ 0.2	$ (0.1)	$ 0.0

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