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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Equity Securities, FV-NI, Unrealized Loss |  | $ 39.4 |  | $ 282.1
Distributions received |  | 4.0 |  | 34.0
Related Party [Member] |  |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | $ 35.6 | $ 31.7 | $ 109.0 | $ 97.8
OGE Energy [Member] | Retained Earnings [Member] |  |  |  |
Dividends, Common Stock |  |  | $ 500.0 |

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