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Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2021 | Jun. 28, 2020 | Jun. 27, 2021 | Jun. 28, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net loss | $ (0.5) | $ (0.5) | $ (2.1) | $ (1.5)
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 | 4.9 | 12.9 | 14.6 | 28.3
Cost of goods sold | (5.6) | (12.1) | (15.7) | (27.1)
Gross (loss) / profit | (0.7) | 0.8 | (1.1) | 1.2
Selling, general and administrative expenses | (0.3) | (1.3) | (1.7) | (2.7)
Operating loss | (1.0) | (0.5) | (2.8) | (1.5)
Tax credit | 0.5 | 0.0 | 0.7 | 0.0
Net loss | $ (0.5) | $ (0.5) | $ (2.1) | $ (1.5)

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