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Acquisition of Jamalco - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Dec. 31, 2023 | May 02, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Deferred credit - preliminary bargain purchase gain | $ 273.4 |  | $ 0.0
General Alumina Holdings Limited |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents |  | $ 19.4 |
Restricted cash |  | 8.3 |
Accounts receivable - net |  | 7.7 |
Non-trade receivables |  | 40.4 |
Inventories |  | 103.9 |
Prepaid and other current assets |  | 4.2 |
Property, plant and equipment |  | 246.2 |
Other assets |  | 26.0 |
Accounts payable, trade |  | (94.8) |
Accrued and other current liabilities |  | (30.8) |
Other liabilities |  | (35.5) |
Asset retirement obligations |  | (23.9) |
Total identifiable assets acquired and liabilities assumed |  | 271.1 |
Less: noncontrolling interest |  | (2.3) |
Deferred credit - preliminary bargain purchase gain |  | $ 273.4 |

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