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Acquisition of Jamalco - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | May 02, 2023
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Business Acquisition [Line Items] |  |  |
Bargain purchase gain | $ 0.0 | $ 273.4 |
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 |  |  | 217.2
Other assets |  |  | 26.1
Accounts payable, trade |  |  | (94.6)
Accrued and other current liabilities |  |  | (29.5)
Other liabilities |  |  | (36.5)
Asset retirement obligations |  |  | (23.9)
Total identifiable assets acquired and liabilities assumed |  |  | 242.7
Less: noncontrolling interest |  |  | (3.2)
Bargain purchase gain |  |  | $ 245.9

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