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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) shares in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred Storm and Property Reserve Deficiency, Current |  | $ 2,700,000 |  |
Allowance for Doubtful Accounts Receivable |  | $ 2,000,000 | $ 2,200,000 |
Provision for Depreciation Rate |  | 2.80% | 2.80% | 2.70%
Depreciation expense |  | $ 436,600,000 | $ 421,600,000 | $ 388,500,000
Projected provision for depreciation in next fiscal year |  | 2.80% |  |
Percent Of Intangible Plant Balance Amortizable |  | 55.30% |  |
Percent of Intangible Plant Balance Amortizable |  | 44.15% |  |
Amortization of intangible assets, period |  | 13 years 1 month 6 days |  |
Amortization of Intangible Assets, Period |  | 19 years 6 months |  |
Amortization of Intangible Assets, Period |  | 23 years 4 months 24 days |  |
Percent of Intangible Plant Balance Amortizable Thereafter |  | 0.55% |  |
Accrued Environmental Loss Contingencies, Noncurrent |  | $ 30,200,000 | $ 27,500,000 |
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  | Other Liabilities, Noncurrent |  |
Public Utilities, Allowance for Funds Used During Construction, Rate |  | 7.10% | 7.00% | 4.80%
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party |  |  | $ 148,300,000 | $ 135,500,000
Equity Securities Sold During Period | 95.4 |  |  |
Proceeds from Sales of Equity Securities | $ 1,067,200,000 |  |  |
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI |  |  |  | 282,100,000
Distributions received |  |  |  | 34,000,000
Maximum [Member] |  |  |  |
Vegetation management operation and maintenance expenses |  | $ 38,200,000 |  |
Regulatory asset |  | 7,500,000 |  |
Gas Transmission Equipment [Member] |  |  |  |
Amount of Acquisition Adjustments |  | $ 3,300,000 |  |
Gas Transmission Equipment [Member] | Minimum [Member] |  |  |  |
Amortization of intangible assets, period |  | 37 years |  |
Gas Transmission Equipment [Member] | Maximum [Member] |  |  |  |
Amortization of intangible assets, period |  | 59 years |  |
Redbud Plant [Member] |  |  |  |
Amortization of intangible assets, period |  | 27 years |  |
Amount of Acquisition Adjustments |  | $ 148,300,000 | 148,300,000 |
OG&E [Member] |  |  |  |
Allowance for Doubtful Accounts Receivable |  | 2,000,000 | 2,200,000 |
Capitalized Computer Software, Gross |  | 280,900,000 | 203,100,000 |
Capitalized Computer Software, Amortization |  | 32,700,000 | $ 33,400,000 | 23,500,000
OG&E [Member] | Minimum [Member] |  |  |  |
Asset Retirement Obligations Accreted, Period |  |  | 3 years |
OG&E [Member] | Maximum [Member] |  |  |  |
Asset Retirement Obligations Accreted, Period |  |  | 68 years |
OGE Energy [Member] |  |  |  |
Unrealized Gain (Loss) on Investments |  |  |  | $ 0
OGE Energy [Member] | Retained Earnings [Member] |  |  |  |
Dividends, Common Stock |  | 130,000,000 | $ 500,000,000 |
Public Utilities, Inventory, Fuel [Member] |  |  |  |
Fuel inventories |  | $ 148,300,000 | $ 158,500,000 |

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