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Equity Method Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
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 consolidated balance sheets, and the related “Income from equity affiliates”:
| Book Value at |  | (Income) Loss from Equity Affiliates
| December 31, |  | Year Ended December 31,
| 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2021
| (Dollars in millions)
Equity method investment related to Middlemount | $ | 42.5 |  |  | $ | 27.1 |  |  | $ | (14.8) |  |  | $ | (135.1) |  |  | $ | (82.1) |
Equity method investment related to R3 | 7.1 |  |  | 7.0 |  |  | 7.9 |  |  | 3.9 |  |  | — |
Total equity method investments | $ | 49.6 |  |  | $ | 34.1 |  |  | $ | (6.9) |  |  | $ | (131.2) |  |  | $ | (82.1) |

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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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