CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 50.2	$ 62.7
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	136.4	137.4
Deferred income taxes and other tax credits, net	7.6	0.7
Allowance for equity funds used during construction	(7.5)	(7.0)
Stock-based compensation expense	3.8	3.0
Regulatory assets	(6.1)	(9.5)
Regulatory liabilities	0.2	0.2
Other assets	1.0	(4.7)
Other liabilities	(18.0)	11.2
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	51.3	(48.8)
Income taxes receivable	1.6	0.0
Fuel, materials and supplies inventories	2.4	13.0
Fuel recoveries	28.2	(59.7)
Other current assets	(6.5)	0.3
Accounts payable	(45.9)	(59.4)
Other current liabilities	(23.2)	(23.5)
Net cash provided from operating activities	175.5	15.9
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(266.8)	(249.5)
Cost of removal and other	(16.5)	(14.2)
Net cash used in investing activities	(283.3)	(263.7)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	(0.6)	(0.1)
Payment of long-term debt	0.0	(32.4)
Increase in short-term debt	200.4	297.4
Increase in long-term borrowings under revolver	0.0	100.0
Dividends paid on common stock	(89.1)	(86.6)
Proceeds (costs) from issuance of common stock	2.7	3.1
Cash paid for employee equity-based compensation	(5.6)	(7.3)
Net cash provided from financing activities	107.8	274.1
NET CHANGE IN CASH AND CASH EQUIVALENTS	0.0	26.3
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0.2	0.6
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0.2	26.9
OG&E [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	57.9	71.0
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	136.4	137.4
Deferred income taxes and other tax credits, net	7.5	0.3
Allowance for equity funds used during construction	(7.5)	(7.0)
Stock-based compensation expense	3.8	3.0
Regulatory assets	(6.1)	(9.5)
Regulatory liabilities	0.2	0.2
Other assets	1.5	(3.5)
Other liabilities	(13.4)	12.2
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	51.1	(48.8)
Fuel, materials and supplies inventories	2.4	13.0
Fuel recoveries	28.2	(59.7)
Other current assets	(5.4)	5.2
Accounts payable	(45.2)	(43.3)
Income taxes payable - parent	4.2	14.0
Other current liabilities	(28.0)	(37.8)
Net cash provided from operating activities	187.6	46.7
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(266.8)	(249.5)
Cost of removal	(17.3)	(13.9)
Net cash used in investing activities	(284.1)	(263.4)
CASH FLOWS FROM FINANCING ACTIVITIES
Changes in advances with parent	97.1	286.8
Proceeds from long-term debt	(0.6)	(0.1)
Payment of long-term debt	0.0	(32.4)
Increase in short-term debt	0.0	17.0
Increase in long-term borrowings under revolver	0.0	100.0
Dividends paid on common stock	0.0	(130.0)
Net cash provided from financing activities	96.5	241.3
NET CHANGE IN CASH AND CASH EQUIVALENTS	0.0	24.6
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0.2	0.2
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 0.2	$ 24.8