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Summary of Significant Accounting Policies Property - Summary of Property Plant and Equipment (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | $ 16,110.4 |  | $ 15,131.3 |
Accumulated Depreciation | 4,809.4 |  | 4,584.5 |
Net property, plant and equipment | 11,301.0 |  | 10,546.8 |
OG&E [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 16,104.3 |  | 15,125.2 |
Accumulated Depreciation | 4,809.4 |  | 4,584.5 |
Net property, plant and equipment | 11,294.9 |  | 10,540.7 |
OG&E [Member] | Electric Generation Equipment [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 5,295.9 | [1] | 5,188.1 | [2]
Accumulated Depreciation | 2,081.0 | [1] | 1,982.7 | [2]
Net property, plant and equipment | 3,214.9 | [1] | 3,205.4 | [2]
OG&E [Member] | Electric Transmission [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 3,306.7 | [3] | 3,180.5 | [4]
Accumulated Depreciation | 707.6 | [3] | 667.9 | [4]
Net property, plant and equipment | 2,599.1 | [3] | 2,512.6 | [4]
OG&E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 568.5 |  | 384.0 |
Accumulated Depreciation | 219.8 |  | 193.6 |
Net property, plant and equipment | 348.7 |  | 190.4 |
OG&E [Member] | Property, Plant and Equipment, Other Types [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 643.1 |  | 591.3 |
Accumulated Depreciation | 236.7 |  | 213.2 |
Net property, plant and equipment | 406.4 |  | 378.1 |
OG&E [Member] | Total Property Plant and Equipment [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 16,104.3 |  | 15,125.2 |
Accumulated Depreciation | 4,809.4 |  | 4,584.5 |
Net property, plant and equipment | 11,294.9 |  | 10,540.7 |
OGE Energy [Member] |  |  |  |
Public Utility, 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 |
[1] | This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.
[2] | This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.
[3] | This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.
[4] | This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.0 million.

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