CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Adjustments to reconcile net income (loss) to net cash (used in) provided from operating activities:
Net Income (Loss) Attributable to Parent		$ 418.1	$ (228.5)
Depreciation and amortization		310.2	292.2
Deferred income taxes and investment tax credits, net		40.9	(168.4)
Equity in (earnings) losses of unconsolidated affiliates	[1]	(127.9)	703.8	[2]
Distributions from unconsolidated affiliates		55.0	73.3
Allowance for equity funds used during construction		(4.8)	(3.7)
Stock-based compensation expense		7.1	6.7
Regulatory assets		(881.5)	(8.5)
Regulatory liabilities		(50.0)	(48.6)
Other assets		(6.7)	(3.7)
Other liabilities		(41.6)	(39.2)
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net		(99.4)	(62.9)
Increase (Decrease) in Income Taxes Receivable		7.6	10.0
Fuel, materials and supplies inventories		8.7	(2.0)
Fuel recoveries		(126.8)	74.3
Other current assets		(4.9)	(6.3)
Accounts payable		(41.4)	(68.6)
Other current liabilities		43.3	5.4
Net cash (used in) provided from operating activities		(494.1)	525.3
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)		(540.6)	(419.7)
Investment in unconsolidated affiliates		(6.3)	(2.4)
Net cash used in investing activities		(546.9)	(422.1)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Issuance of Long-term Debt		999.6	297.1
Increase (decrease) in short-term debt		288.2	(112.0)
Payment of long-term debt		(0.1)	(0.1)
Dividends paid on common stock		(242.8)	(234.4)
Net cash provided from (used in) financing activities		1,041.4	(71.2)
NET CHANGE IN CASH AND CASH EQUIVALENTS		0.4	32.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD		1.1	0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD		1.5	32.0
Proceeds from (Payments for) Other Financing Activities		(3.5)	(7.1)
Treasury Stock, Value, Acquired, Cost Method		0.0	(14.7)
OG&E [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided from operating activities:
Net Income (Loss) Attributable to Parent		320.1	298.3
Depreciation and amortization		310.2	292.2
Deferred income taxes and investment tax credits, net		32.1	23.9
Allowance for equity funds used during construction		(4.8)	(3.7)
Stock-based compensation expense		1.6	2.2
Regulatory assets		(881.5)	(8.5)
Regulatory liabilities		(50.0)	(48.6)
Other assets		(0.9)	(3.2)
Other liabilities		(38.2)	(27.6)
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net		(100.8)	(62.4)
Fuel, materials and supplies inventories		8.7	(2.0)
Fuel recoveries		(126.8)	74.3
Other current assets		(3.2)	(5.8)
Accounts payable		(39.3)	(59.6)
Other current liabilities		36.0	(0.7)
Net cash (used in) provided from operating activities		(529.6)	478.4
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)		(540.6)	(419.7)
Net cash used in investing activities		(540.6)	(419.7)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Issuance of Long-term Debt		499.8	297.1
Payment of long-term debt		(0.1)	(0.1)
Net cash provided from (used in) financing activities		1,071.7	(26.7)
NET CHANGE IN CASH AND CASH EQUIVALENTS		1.5	32.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD		0.0	0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD		1.5	32.0
Increase (Decrease) in Income Taxes Payable		7.2	9.6
Changes In Advances With Parent		87.0	(248.7)
Proceeds from Contributed Capital		530.0	0.0
Payments of Dividends		$ (45.0)	$ (75.0)

[1] For the three and nine months ended September 30, 2020, Enable recorded a $225.0 million impairment on its SESH equity method investment, which is included in their net loss for each period. 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 (loss) and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above.

[2] In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4