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Long-Term Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Long-term Debt | $ 4,340.5 | $ 4,548.6
Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | Jan. 01, 2025 |
Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | Jan. 01, 2025 |
Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | Jun. 01, 2027 |
Redeemable during the next 12 months |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 135.4 |
OG&E [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 4,290.6 | 3,998.9
OG&E [Member] | Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | Jan. 01, 2025 |
OG&E [Member] | Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | Jan. 01, 2025 |
OG&E [Member] | Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | Jun. 01, 2027 |
OG&E [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 47.0 | 47.0
OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt | 32.4 | 32.4
OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 56.0 | $ 56.0
Minimum [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.85% |
Minimum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.85% |
Minimum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.85% |
Minimum [Member] | OG&E [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.85% |
Minimum [Member] | OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.85% |
Minimum [Member] | OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.85% |
Maximum [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |
Maximum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.60% |
Maximum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |
Maximum [Member] | OG&E [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |
Maximum [Member] | OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.60% |
Maximum [Member] | OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |

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