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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain/ (loss) on disposition |  |  | $ 0.0 | $ 0.0 | $ 6.6
Impairment charges |  |  | 0.0 | 0.0 | (1.5)
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
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 paid |  | $ 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 paid | $ 4.0 |  |  |  |
Gain/ (loss) on disposition | $ (0.5) |  |  |  |
Superform U.S Business | Discontinued operations, disposed of by sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal related credit |  |  | 0.2 |  |
Superform U.S Business | Discontinued operations, held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain/ (loss) on disposition |  |  | 0.0 | 0.0 | 6.6
Impairment charges |  |  | 0.0 | (2.6) | (1.5)
Acquisition and disposal credit / (costs) |  |  | 0.2 | (2.0) | $ 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] |  |  |  |  |
Disposal group, including discontinued operation, property, plant and equipment |  |  | $ 1.2 | $ 1.2 |

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