Summary of Significant Accounting Policies - Schedule of Jointly Owned Utility Plants (Details) - USD ($) $ in Millions	Dec. 31, 2023		Dec. 31, 2022
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
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	$ 265.4	[1]	$ 261.9	[2]
Accumulated Depreciation	129.2	[1]	119.4	[2]
Net property, plant and equipment	$ 136.2	[1]	$ 142.5	[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	$ 548.9	[1],[3]	$ 542.1	[2],[4]
Accumulated Depreciation	245.5	[1],[3]	225.2	[2],[4]
Net property, plant and equipment	303.4	[1],[3]	316.9	[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	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] | Total Property Plant and Equipment [Member]
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 Transmission and Distribution [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,290.1		5,781.3
Accumulated Depreciation	1,564.3		1,527.1
Net property, plant and equipment	4,725.8		4,254.2
OG&E [Member] | Electric Generation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,295.9	[5]	5,188.1	[6]
Accumulated Depreciation	2,081.0	[5]	1,982.7	[6]
Net property, plant and equipment	3,214.9	[5]	3,205.4	[6]
OG&E [Member] | Electric Transmission [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,306.7	[7]	3,180.5	[8]
Accumulated Depreciation	707.6	[7]	667.9	[8]
Net property, plant and equipment	2,599.1	[7]	2,512.6	[8]
OG&E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member]
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]
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

[1] Construction work in progress was $0.3 million and $2.0 million for the McClain and Redbud Plants, respectively.

[2] Construction work in progress was $0.7 million and $1.5 million for the McClain and Redbud Plants, respectively.

[3] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.

[4] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.

[5] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.

[6] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.

[7] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.

[8] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.0 million.