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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain/ loss on disposition |  |  | $ 0.0 | $ 6.6 | $ 0.0
Impairment charges |  |  | 0.0 | 1.5 | 0.0
Discontinued operations, disposed of by sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain/ loss on disposition |  | $ 6.6 |  |  |
Discontinued operations, held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Acquisition and disposal costs |  |  | (2.0) |  |
U.S Aluminum Business | Discontinued operations, disposed of by sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Consideration received |  | 20.2 |  |  |
Gain/ loss on disposition |  | $ 7.1 |  |  |
Superform U.K. Business | Discontinued operations, disposed of by sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Consideration received | $ 4.0 |  |  |  |
Gain/ loss on disposition | $ (0.5) |  |  |  |
Superform U.S Business | Discontinued operations, held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment charges |  |  | 2.6 | 1.5 | 0.0
Acquisition and disposal costs |  |  | (2.0) | 0.0 | $ 0.0
Held-for-sale | Elektron Segment | Land and Building |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Amount of property to be disposed |  |  | $ 1.2 |  |
Held-for-sale | Elektron Segment | Building |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Amount of property to be disposed |  |  |  | $ 3.7 |

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