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Receivables, Loans, Notes Receivable, and Others (Tables) | 3 Months Ended
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Mar. 31, 2025
Equity Method Investments and Joint Ventures [Abstract] |
Equity Method Investments | The table below summarizes the book value of those investments, which are reported in “Investments and other assets” in the condensed consolidated balance sheets, and the related “Loss from equity affiliates” in the unaudited condensed consolidated statements of operations:
|  |  | Loss from Equity Affiliates
| Book Value at |  | Three Months Ended March 31, |  |
| March 31, 2025 |  | December 31, 2024 |  | 2025 |  | 2024 |  |  |  |
| (Dollars in millions)
Equity method investment related to Middlemount | $ | 46.8 |  |  | $ | 52.7 |  |  | $ | 6.3 |  |  | $ | 0.4 |  |  |  |  |
Equity method investment related to R3 | — |  |  | — |  |  | — |  |  | 3.3 |  |  |  |  |
Equity method investment related to R3 II | 3.1 |  |  | 5.8 |  |  | 0.4 |  |  | — |  |  |  |  |
Total equity method investments | $ | 49.9 |  |  | $ | 58.5 |  |  | $ | 6.7 |  |  | $ | 3.7 |  |  |  |  |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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