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Summary of Significant Accounting Policies Property - Summary of Property Plant and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Public Utility, 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
OG&E [Member]    
Public Utility, 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 Generation Equipment [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 5,518.5 [1] 5,295.9 [2]
Accumulated Depreciation 2,145.9 [1] 2,081.0 [2]
Net property, plant and equipment 3,372.6 [1] 3,214.9 [2]
OG&E [Member] | Electric Transmission [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,432.1 [3] 3,306.7 [4]
Accumulated Depreciation 748.5 [3] 707.6 [4]
Net property, plant and equipment 2,683.6 [3] 2,599.1 [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 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]    
Public Utility, 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
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 $89.3 million.
[2] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.
[3] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.2 million.
[4] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.