CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 737.3	$ (173.7)		$ 433.6
Gain (Loss) on Disposition of Assets	(353.0)	0.0		0.0
Adjustments to reconcile net income (loss) to net cash (used in) provided from operating activities:
Depreciation and amortization	416.0	391.3		355.0
Deferred income taxes and other tax credits, net	125.9	(134.5)		27.6
Equity in (earnings) losses of unconsolidated affiliates	(169.8)	668.0	[1],[2]	(113.9)	[1]
Distributions from unconsolidated affiliates	73.4	91.7		125.5
Unrealized Gain (Loss) on Investments	8.6	0.0		0.0
Allowance for equity funds used during construction	(6.7)	(4.8)		(4.5)
Stock-based compensation expense	9.8	9.8		13.9
Regulatory assets	874.9	112.0		47.1
Regulatory liabilities	(71.2)	(64.0)		(45.6)
Other assets	(9.8)	(9.2)		(3.8)
Other liabilities	(8.1)	(26.3)		19.2
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	(1.9)	3.1		18.8
Income taxes receivable	5.5	2.8		(1.0)
Fuel, materials and supplies inventories	(3.4)	(8.9)		4.2
Fuel recoveries	(180.5)	63.3		(33.0)
Other current assets	(22.7)	(16.8)		5.1
Accounts payable	7.5	59.8		(34.5)
Other current liabilities	4.7	(26.8)		(38.0)
Net cash (used in) provided from operating activities	(313.3)	712.8		681.5
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(778.5)	(650.5)		(635.5)
Other	(5.6)	(4.4)		(7.7)
Return of capital - unconsolidated affiliates	0.0	0.0		18.5
Proceeds from Divestiture of Businesses and Interests in Affiliates	35.0	0.0		0.0
Net cash used in investing activities	(749.1)	(654.9)		(624.7)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in short-term debt	391.9	(17.0)		112.0
Proceeds from long-term debt	997.8	297.1		296.5
Payment of long-term debt	(0.1)	(0.1)		(250.1)
Dividends paid on common stock	(324.9)	(314.9)		(299.2)
Cash paid for employee equity-based compensation and expense of common stock	(3.4)	(7.1)		(10.3)
Other	0.0	(0.1)		0.0
Purchase of treasury stock	0.0	(14.7)		0.0
Net cash provided from (used in) financing activities	1,061.3	(56.8)		(151.1)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(1.1)	1.1		(94.3)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	1.1	0.0		94.3
CASH AND CASH EQUIVALENTS AT END OF YEAR	0.0	1.1		0.0
Interest costs capitalized	3.5	1.9		2.8
Interest (net of interest capitalized)	156.4	153.4		152.2
Income taxes (net of income tax refunds)	8.7	3.9		5.5
Power plant long-term service agreement	2.4	6.8		28.9
Noncash or Part Noncash Acquisition, Investments Acquired	793.7	0.0		0.0
Og and E [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided from operating activities:
Depreciation and amortization	416.0	391.3		355.0
Deferred income taxes and other tax credits, net	44.6	40.9		20.4
Allowance for equity funds used during construction	(6.7)	(4.8)		(4.5)
Stock-based compensation expense	2.2	3.0		4.9
Regulatory assets	874.9	112.0		47.1
Regulatory liabilities	(71.2)	(64.0)		(45.6)
Other assets	(2.2)	(3.4)		3.8
Other liabilities	(11.2)	(24.3)		8.4
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	(3.0)	4.5		17.0
Fuel, materials and supplies inventories	(3.4)	(8.9)		4.2
Fuel recoveries	(180.5)	63.3		(33.0)
Other current assets	(21.4)	(17.3)		5.9
Accounts payable	(11.0)	64.8		(30.0)
Other current liabilities	3.3	(26.8)		(35.1)
Net cash (used in) provided from operating activities	(358.7)	640.4		573.8
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(778.5)	(650.5)		(635.5)
Net cash used in investing activities	(778.5)	(650.5)		(635.5)
Proceeds from Contributions from Parent	530.0	0.0		0.0
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	499.8	297.1		296.5
Payment of long-term debt	(0.1)	(0.1)		(250.1)
Dividends paid on common stock	(265.0)	(325.0)		0.0
Net cash provided from (used in) financing activities	1,137.2	10.1		61.7
NET CHANGE IN CASH AND CASH EQUIVALENTS	0.0	0.0		0.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	0.0	0.0		0.0
CASH AND CASH EQUIVALENTS AT END OF YEAR	0.0	0.0		0.0
Interest costs capitalized	3.5	1.9		2.8
Net Income (Loss) Attributable to Parent	360.0	339.4		350.2
Increase (Decrease) in Income Taxes Payable	0.7	(5.3)		(0.7)
Changes In Advances With Parent	372.5	38.1		15.3
Interest (net of interest capitalized)	148.9	150.2		144.6
Income taxes (net of income tax refunds)	(3.2)	(0.2)		1.3
Power plant long-term service agreement	$ 2.4	$ 6.8		$ 28.9

[1] 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

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