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Acquisition of Jamalco - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 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 - net | 217.2 |
Other assets | 26.1 |
Accounts payable, trade | (94.6) |
Accrued and other current liabilities | (29.5) |
Other liabilities | (36.5) |
Asset retirement obligation | (23.9) |
Total identifiable net assets acquired and liabilities assumed | 242.7 |
Less: noncontrolling interest | (3.2) |
Bargain purchase gain | $ 245.9 |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1 + Details
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