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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
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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)

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