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Summary of Significant Accounting Policies - Schedule of Jointly Owned Utility Plants (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | $ 17,068.8 |  | $ 16,110.4 |
Accumulated Depreciation | 4,982.2 |  | 4,809.4 |
Net property, plant and equipment | $ 12,086.6 |  | $ 11,301.0 |
McClain Plant [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 77.00% | [1] | 77.00% | [2]
Property, Plant and Equipment, Gross | $ 244.4 | [1] | $ 265.4 | [2]
Accumulated Depreciation | 75.8 | [1] | 129.2 | [2]
Net property, plant and equipment | $ 168.6 | [1] | $ 136.2 | [2]
Redbud Plant [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 51.00% | [1],[3] | 51.00% | [2],[4]
Property, Plant and Equipment, Gross | $ 556.7 | [1],[3] | $ 548.9 | [2],[4]
Accumulated Depreciation | 247.7 | [1],[3] | 245.5 | [2],[4]
Net property, plant and equipment | 309.0 | [1],[3] | 303.4 | [2],[4]
OGE Energy [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 6.1 |  | 6.1 |
Accumulated Depreciation | 0.0 |  | 0.0 |
Net property, plant and equipment | 6.1 |  | 6.1 |
OG&E [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 17,062.7 |  | 16,104.3 |
Accumulated Depreciation | 4,982.2 |  | 4,809.4 |
Net property, plant and equipment | 12,080.5 |  | 11,294.9 |
OG&E [Member] | Electric Transmission and Distribution [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 6,654.5 |  | 6,290.1 |
Accumulated Depreciation | 1,639.8 |  | 1,564.3 |
Net property, plant and equipment | 5,014.7 |  | 4,725.8 |
OG&E [Member] | Electric Generation Equipment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 5,518.5 | [5] | 5,295.9 | [6]
Accumulated Depreciation | 2,145.9 | [5] | 2,081.0 | [6]
Net property, plant and equipment | 3,372.6 | [5] | 3,214.9 | [6]
OG&E [Member] | Electric Transmission [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 3,432.1 | [7] | 3,306.7 | [8]
Accumulated Depreciation | 748.5 | [7] | 707.6 | [8]
Net property, plant and equipment | 2,683.6 | [7] | 2,599.1 | [8]
OG&E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 752.3 |  | 568.5 |
Accumulated Depreciation | 203.7 |  | 219.8 |
Net property, plant and equipment | 548.6 |  | 348.7 |
OG&E [Member] | Property, Plant and Equipment, Other Types [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 705.3 |  | 643.1 |
Accumulated Depreciation | 244.3 |  | 236.7 |
Net property, plant and equipment | $ 461.0 |  | $ 406.4 |
[1] | Construction work in progress was $0.8 million and $5.1 million for the McClain and Redbud Plants, respectively.
[2] | Construction work in progress was $0.3 million and $2.0 million for the McClain and Redbud Plants, respectively.
[3] | This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $89.3 million.
[4] | This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.
[5] | This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $89.3 million.
[6] | This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.
[7] | This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.2 million.
[8] | This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.

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