CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 120.9	$ 126.7
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	264.7	245.3
Deferred income taxes and other tax credits, net	7.9	1.2
Allowance for equity funds used during construction	(11.3)	(9.6)
Stock-based compensation expense	6.5	6.3
Regulatory assets	(29.5)	(65.9)
Regulatory liabilities	(5.5)	(5.7)
Other assets	(5.3)	(2.2)
Other liabilities	42.8	2.3
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	(47.5)	(32.0)
Income taxes receivable	11.6	13.9
Fuel, materials and supplies inventories	29.1	(44.4)
Fuel recoveries	9.3	316.6
Other current assets	(8.7)	47.6
Accounts payable	(48.4)	(111.8)
Other current liabilities	(0.5)	17.9
Net cash provided from operating activities	336.1	506.2
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(550.2)	(580.6)
Cost of removal and other	(39.4)	(51.4)
Net cash used in investing activities	(589.6)	(632.0)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	356.5	788.8
Payment of long-term debt	(0.1)	(1,000.1)
Increase (decrease) in short-term debt	(137.9)	418.1
Increase in long-term borrowings under revolver		0.0
Dividends paid on common stock	(169.9)	(166.5)
Proceeds (costs) from issuance of common stock	10.9	0.0
Cash paid for employee equity-based compensation	(6.1)	(2.3)
Net cash provided from financing activities	253.4	38.0
NET CHANGE IN CASH AND CASH EQUIVALENTS	(0.1)	(87.8)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0.2	88.1
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0.1	0.3
OG&E [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	134.5	131.7
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	264.7	245.3
Deferred income taxes and other tax credits, net	8.8	(0.4)
Allowance for equity funds used during construction	(11.3)	(9.6)
Stock-based compensation expense	6.5	1.5
Regulatory assets	(29.5)	(65.9)
Regulatory liabilities	(5.5)	(5.7)
Other assets	(1.7)	(2.0)
Other liabilities	47.9	4.3
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	(46.7)	(32.6)
Fuel, materials and supplies inventories	29.1	(44.4)
Fuel recoveries	9.3	316.6
Other current assets	(12.9)	51.5
Accounts payable	(29.2)	(97.4)
Income taxes payable - parent	17.2	17.9
Other current liabilities	5.7	24.7
Net cash provided from operating activities	386.9	535.5
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(550.2)	(580.6)
Cost of removal	(37.4)	(49.3)
Net cash used in investing activities	(587.6)	(629.9)
CASH FLOWS FROM FINANCING ACTIVITIES
Changes in advances with parent	0.7	55.9
Proceeds from long-term debt	0.0	788.8
Payment of long-term debt	(0.1)	(500.1)
Increase in long-term borrowings under revolver	200.0	0.0
Dividends paid on common stock	0.0	(250.0)
Net cash provided from financing activities	200.6	94.6
NET CHANGE IN CASH AND CASH EQUIVALENTS	(0.1)	0.2
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0.2	0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 0.1	$ 0.2