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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
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 02, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
NET INCOME (LOSS) |  |  |  |  | $ 665.7 | $ 737.3 | $ (173.7) |
Timing Differences Related to Equity Method Investee Net Income |  |  | $ 9.0 |  |  |  | 0.0 |
Proportionate Unconsolidated Affiliate Net Income |  |  | 119.8 |  |  |  | 13.2 |
Amortization of basis difference and dilution recognition | [1] |  | 50.0 |  |  |  | 98.8 |
Equity Method Investment, Other than Temporary Impairment |  | $ (780.0) | 0.0 | [2] |  |  | (780.0) | [2]
Equity in earnings of unconsolidated affiliates |  |  | $ 169.8 | [3] | $ 0.0 | $ 169.8 | $ (668.0) | [3],[4]
OGE Holdings [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest |  |  | 25.50% |  |  |  | 25.50% |
Equity Method Investment Nonconsolidated Investees [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity in earnings of unconsolidated affiliates |  |  | $ 470.0 |  |  |  | $ 52.0 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
NET INCOME (LOSS) |  |  | $ 461.0 |  |  |  | 52.0 |
OGE Energy [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  |  | $ (225.0) |
[1] | Includes loss on dilution, net of proportional basis difference recognition.
[2] | During the year ended December 31, 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable as, effective March 31, 2020, OGE estimated the fair value of its investment in Enable was below the book value and concluded the decline in value was not temporary.
[3] | For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on an equity method investment, which ran through OGE Energy's portion of Enable net income and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above.
[4] | In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable

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