Short-Term Debt and Credit Facilities (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Short-term debt		$ 731.5	$ 486.9
Line of Credit Facility [Abstract]
Aggregate Commitment		1,100.0
Long-term Line of Credit	[1]	$ 731.9
Weighted Average Interest Rate		1.14%
Intercompany Borrowing Agreement - Maximum Borrowing Capacity		$ 350.0
Outstanding Intercompany Borrowings		48.7
OGE Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	[2]	550.0
Line of Credit Facility [Abstract]
Long-term Line of Credit	[1],[2]	$ 549.0
Weighted Average Interest Rate	[2]	1.14%
Maturity	[2],[3]	Dec. 17, 2026
OG&E [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	[4],[5]	$ 550.0
Short-term debt		182.5	0.0
Line of Credit Facility [Abstract]
Letters of Credit Outstanding, Amount	[1],[4],[5]	$ 182.9
Weighted Average Interest Rate	[4],[5]	1.11%
Maturity	[3],[5]	Dec. 17, 2026
Short Term Borrowing Capacity That Has Regulatory Approval		$ 800.0
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt		2 years
Advances from parent		$ 90.3	$ 101.3

[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at March 31, 2022.

[2] This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.

[3] Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.

[4] OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $350.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 17, 2026. At March 31, 2022, there were $48.7 million in intercompany borrowings under this agreement.

[5] This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.