CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Net Income (Loss) Attributable to Parent	$ 165.6	$ (405.9)
Depreciation and amortization	201.6	191.7
Deferred income taxes and investment tax credits, net	15.5	(226.7)
Equity in (earnings) losses of unconsolidated affiliates	(86.7)	719.6	[1]
Distributions from unconsolidated affiliates	36.7	55.0
Allowance for equity funds used during construction	(2.9)	(2.6)
Stock-based compensation expense	4.8	4.3
Regulatory assets	(879.5)	(6.1)
Regulatory liabilities	(34.4)	(26.7)
Other assets	(5.8)	1.3
Other liabilities	(43.3)	(15.6)
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	(41.9)	(35.8)
Increase (Decrease) in Income Taxes Receivable	4.0	10.4
Fuel, materials and supplies inventories	(10.4)	(1.5)
Fuel recoveries	(24.3)	71.9
Other current assets	(5.6)	(10.8)
Accounts payable	(71.1)	(51.2)
Other current liabilities	9.9	(8.0)
Net cash (used in) provided from operating activities	(767.8)	263.3
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(353.5)	(280.8)
Investment in unconsolidated affiliates	(3.3)	(1.5)
Net cash used in investing activities	(356.8)	(282.3)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Issuance of Long-term Debt	999.6	297.2
Increase (decrease) in short-term debt	289.5	(37.0)
Dividends paid on common stock	(162.2)	(156.8)
Net cash provided from financing activities	1,123.5	86.5
NET CHANGE IN CASH AND CASH EQUIVALENTS	(1.1)	67.5
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1.1	0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0.0	67.5
Proceeds from (Payments for) Other Financing Activities	(3.4)	(7.2)
Treasury Stock, Value, Acquired, Cost Method	0.0	(9.7)
OG&E [Member]
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Net Income (Loss) Attributable to Parent	96.3	98.8
Depreciation and amortization	201.6	191.7
Deferred income taxes and investment tax credits, net	10.3	6.7
Allowance for equity funds used during construction	(2.9)	(2.6)
Stock-based compensation expense	1.0	1.6
Regulatory assets	(879.5)	(6.1)
Regulatory liabilities	(34.4)	(26.7)
Other assets	(1.4)	(2.3)
Other liabilities	(38.3)	(7.0)
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	(43.9)	(34.2)
Fuel, materials and supplies inventories	(10.4)	(1.5)
Fuel recoveries	(24.3)	71.9
Other current assets	(1.3)	(6.8)
Accounts payable	(66.4)	(45.6)
Other current liabilities	8.2	(19.0)
Net cash (used in) provided from operating activities	(782.8)	223.9
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(353.5)	(280.8)
Net cash used in investing activities	(353.5)	(280.8)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Issuance of Long-term Debt	499.8	297.2
Net cash provided from financing activities	1,136.3	124.4
NET CHANGE IN CASH AND CASH EQUIVALENTS	0.0	67.5
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0.0	0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0.0	67.5
Increase (Decrease) in Income Taxes Payable	2.6	5.0
Changes In Advances With Parent	106.5	(172.8)
Proceeds from Contributed Capital	$ 530.0	$ 0.0

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