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Curtailment of Operations - Hawesville (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 22, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Asset impairment |  | $ 0.0 | $ 0.0 | $ 159.4 | $ 0.0 |
Property, plant and equipment - net |  | 740.9 |  | 740.9 |  | $ 892.5
OPEB curtailment gain, net |  |  |  | 8.0 | $ 0.0 |
Hawesville |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Asset impairment | $ 159.4 |  |  |  |  |
Property, plant and equipment - net | $ 15.0 |  |  |  |  |
Severance costs |  | $ 12.6 |  |  |  |
OPEB curtailment gain, net |  |  |  | $ 8.0 |  |

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