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Summary of Significant Accounting Policies - Reconciliation of Equity in Earnings (Losses) of Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 11 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 02, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net income (loss) |  |  | $ 416.8 | $ 665.7 | $ 737.3
Proportionate Unconsolidated Affiliate Net Income |  | $ 119.8 |  |  |
Amortization of basis difference and dilution recognition | [1] | 50.0 |  |  |
Equity in earnings of unconsolidated affiliates |  | $ 169.8 | $ 0.0 | $ 0.0 | $ 169.8
OGE Holdings [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest |  | 25.50% |  |  |
Equity Method Investment Nonconsolidated Investees [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in earnings of unconsolidated affiliates |  | $ 470.0 |  |  |
[1] | Includes loss on dilution, net of proportional basis difference recognition.

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