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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
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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