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Investment in Unconsolidated Affiliate (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 02, 2021 | Mar. 31, 2020 | Dec. 02, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Distributions received |  |  |  |  | $ 34.0 |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  | $ 169.8 | [1] | 0.0 | $ 169.8 | $ (668.0) | [1],[2] |
Share Price |  |  |  |  |  |  |  |  | $ 38.56
Equity Method Investment, Other than Temporary Impairment |  | $ 780.0 | $ (0.0) | [3] |  |  | 780.0 | [3] |
Gain (Loss) on Disposition of Assets |  |  |  |  | $ 0.0 | 344.4 | 0.0 |  |
Proceeds from Sales of Assets, Investing Activities | $ 35.0 |  |  |  |  |  |  |  |
Fees paid from disposition of assets | $ 8.6 |  |  |  |  |  |  |  |
OGE Energy [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares | 95,389,721 |  | 95,389,721 |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  |  | 225.0 |  |
Gain (Loss) on Disposition of Assets | $ 344.4 |  |  |  |  |  |  |  |
CenterPoint [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sales of Assets, Investing Activities | 30.0 |  |  |  |  |  |  |  |
Energy Transfer |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sales of Assets, Investing Activities | $ 5.0 |  |  |  |  |  |  |  |
Natural Gas Midstream Operations [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  | 169.8 | $ (668.0) | [2] |
Gain (Loss) on Disposition of Assets |  |  |  |  |  | $ 344.4 |  |  |
[1] | 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.
[2] | In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable
[3] | 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.

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