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Discontinued Operations - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 28, 2021 USD ($) building | Mar. 29, 2020 USD ($) | Dec. 31, 2020 USD ($) building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain on disposition of discontinued operations, net of tax | $ 7.5 | $ 0.0 |
Superform Aluminum Superplastic |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain on disposition of discontinued operations, net of tax | 7.5 |  |
Tax expense | 2.0 |  |
Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Property, plant and equipment | $ 5.1 |  | $ 11.6
Held-for-sale | Building | Elektron segment |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of properties to be disposed | building | 1 |  | 1
Property, plant and equipment | $ 3.7 |  | $ 3.7

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