CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 52.7	$ (491.8)
Depreciation and amortization	98.7	94.4
Deferred income taxes and investment tax credits, net	8.7	(254.7)
Equity in (earnings) losses of unconsolidated affiliates	(53.2)	746.5	[1]
Distributions from unconsolidated affiliates	18.3	33.5
Allowance for equity funds used during construction	(1.3)	(1.3)
Stock-based compensation expense	2.5	2.0
Regulatory assets	(859.9)	0.3
Regulatory liabilities	(16.3)	(11.7)
Other assets	(5.5)	2.6
Other liabilities	(45.4)	(9.4)
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	26.0	16.2
Increase (Decrease) in Income Taxes Receivable	1.7	0.0
Fuel, materials and supplies inventories	(7.0)	(5.0)
Fuel recoveries	(104.9)	50.3
Other current assets	(2.5)	3.6
Accounts payable	(28.7)	(32.8)
Other current liabilities	(24.1)	(38.8)
Net cash (used in) provided from operating activities	(940.2)	103.9
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(158.4)	(127.2)
Investment in unconsolidated affiliates	(0.6)	(0.9)
Return of capital - unconsolidated affiliates	0.0	3.2
Net cash used in investing activities	(159.0)	(124.9)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase in short-term debt	1,183.1	263.0
Dividends paid on common stock	(81.7)	(79.3)
Net cash provided from financing activities	1,098.1	166.9
NET CHANGE IN CASH AND CASH EQUIVALENTS	(1.1)	145.9
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1.1	0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0.0	145.9
Proceeds from (Payments for) Other Financing Activities	(3.3)	(7.1)
Treasury Stock, Value, Acquired, Cost Method	0.0	(9.7)
Net Income (Loss) Attributable to Parent	52.7	(491.8)
Depreciation and amortization	98.7	94.4
Proceeds from Contributed Capital	530.0
Premium on Common Stock
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	0.0	0.0
CASH FLOWS FROM FINANCING ACTIVITIES
Treasury Stock, Value, Acquired, Cost Method		0.0
OG&E [Member]
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Deferred income taxes and investment tax credits, net	0.8	1.1
Allowance for equity funds used during construction	(1.3)	(1.3)
Stock-based compensation expense	0.4	0.9
Regulatory assets	(859.9)	0.3
Regulatory liabilities	(16.3)	(11.7)
Other assets	(4.4)	(0.1)
Other liabilities	(34.8)	(2.5)
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	27.7	18.9
Fuel, materials and supplies inventories	(7.0)	(5.0)
Fuel recoveries	(104.9)	50.3
Other current assets	0.6	(4.5)
Accounts payable	(29.1)	(27.0)
Other current liabilities	(22.4)	(45.5)
Net cash (used in) provided from operating activities	(939.9)	89.0
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(158.4)	(127.2)
Net cash used in investing activities	(158.4)	(127.2)
CASH FLOWS FROM FINANCING ACTIVITIES
Net cash provided from financing activities	1,098.3	38.2
NET CHANGE IN CASH AND CASH EQUIVALENTS	0.0	0.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0.0	0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0.0	0.0
Net Income (Loss) Attributable to Parent	11.2	19.9
Depreciation and amortization	98.7	94.4
Increase (Decrease) in Income Taxes Payable	0.8	0.8
Changes In Advances With Parent	568.3	38.2
Proceeds from Contributed Capital	530.0	0.0
OG&E [Member] | Premium on Common Stock
CASH FLOWS FROM FINANCING ACTIVITIES
Net Income (Loss) Attributable to Parent	$ 0.0	$ 0.0

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