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.