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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 9 Months Ended
Oct. 01, 2023
Sep. 25, 2022
Oct. 01, 2023
Sep. 25, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net sales $ 1.9 $ 1.8 $ 6.1 $ 5.5
Cost of goods sold (1.4) (1.7) (5.0) (4.9)
Gross profit 0.5 0.1 1.1 0.6
Selling, general and administrative expenses (0.3) (0.1) (1.0) (0.5)
Restructuring credit / (charge) 0.1 0.0 (0.1) (0.3)
Acquisition and disposal related costs 0.0 (0.7) 0.0 (0.9)
Operating income / (loss) 0.3 (0.7) 0.0 (1.1)
Tax (charge) / credit (0.1) 0.2 0.0 0.2
Net income / (loss) $ 0.2 $ (0.5) $ 0.0 $ (0.9)