Investment in Unconsolidated Affiliate Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($) $ in Millions		11 Months Ended		12 Months Ended
		Dec. 02, 2021		Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Timing Differences Related to Equity Method Investee Net Income		$ 9.0			$ 0.0		$ 0.0
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest		25.50%			25.50%		25.50%
Proportionate Unconsolidated Affiliate Net Income		$ 119.8			$ 13.2		$ 91.8
Amortization of basis difference and dilution recognition	[1]	50.0			98.8		22.1
Equity Method Investment, Other than Temporary Impairment	[2]	0.0			780.0		0.0
Equity in earnings of unconsolidated affiliates		169.8	[3]	$ 169.8	(668.0)	[3],[4]	113.9	[3]
Net income (loss)				737.3	(173.7)		433.6
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Equity in earnings of unconsolidated affiliates		470.0			52.0		360.0
Net income (loss)		$ 461.0			52.0		360.0
Natural Gas Midstream Operations [Member]
Schedule of Equity Method Investments [Line Items]
Equity in earnings of unconsolidated affiliates				169.8	(668.0)	[4]	113.9
Net income (loss)				$ 385.0	$ (515.0)		$ 81.4
OGE Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest				25.50%

[1] Includes loss on dilution, net of proportional basis difference recognition.

[2] Effective March 31, 2020, OGE Energy estimated the fair value of its investment in Enable was below the book value and concluded the decline in value was not temporary due to the severity of the decline and recent rapid deterioration, as well as the near term future outlook, of the midstream oil and gas industry. Accordingly, OGE Energy recorded a $780.0 million impairment on its investment in Enable in 2020. Further information concerning the fair value method used to measure the impairment on OGE Energy's investment in Enable can be found in Note 7.

[3] For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on its SESH equity method investment. Enable estimated the fair value of this equity method investment was below the carrying value at September 30, 2020 and concluded the decline in value was other than temporary due to the expiration of a transportation contract and the current status of renewal negotiations. The impairment ran through OGE Energy's portion of Enable net income and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above

[4] In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 5 and 7.