CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from contracts with customers	$ 2,607.3	$ 3,304.2	$ 3,588.7
Other revenues	67.0	71.5	65.0
Operating revenues	2,674.3	3,375.7	3,653.7
FUEL, PURCHASED POWER AND DIRECT TRANSMISSION EXPENSE	911.7	1,662.4	2,127.6
OPERATING EXPENSES
Other operation and maintenance	502.6	501.4	463.1
Depreciation and amortization	506.6	460.9	416.0
Taxes other than income	103.2	101.5	102.8
Operating expenses	1,112.4	1,063.8	981.9
OPERATING INCOME	650.2	649.5	544.2
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	19.4	6.9	6.7
Other net periodic benefit income (expense)	5.6	(12.9)	(6.1)
Gain (loss) on equity securities (Note 1)	0.0	282.1	(8.6)
Equity in earnings of unconsolidated affiliates	0.0	0.0	169.8
Gain on Enable/Energy Transfer transaction, net	0.0	0.0	344.4
Other income	48.2	74.6	26.3
Other expense	(29.0)	(44.6)	(39.9)
Net other income	44.2	306.1	492.6
INTEREST EXPENSE
Interest on long-term debt	205.0	162.1	154.8
Allowance for borrowed funds used during construction	(7.1)	(4.0)	(3.5)
Interest on short-term debt and other interest charges	23.5	8.2	7.0
Interest expense	221.4	166.3	158.3
INCOME BEFORE TAXES	473.0	789.3	878.5
INCOME TAX EXPENSE	56.2	123.6	141.2
NET INCOME	$ 416.8	$ 665.7	$ 737.3
BASIC AVERAGE COMMON SHARES OUTSTANDING	200.3	200.2	200.1
DILUTED AVERAGE COMMON SHARES OUTSTANDING	200.9	200.8	200.3
BASIC EARNINGS PER AVERAGE COMMON SHARE	$ 2.08	$ 3.33	$ 3.68
DILUTED EARNINGS PER AVERAGE COMMON SHARE	$ 2.07	$ 3.32	$ 3.68
Other comprehensive income, net of tax	$ 4.7	$ 12.9	$ 7.3
Comprehensive income	421.5	678.6	744.6
OG&E [Member]
Revenues from contracts with customers	2,607.3	3,304.2	3,558.7
Other revenues	67.0	71.5	65.0
Operating revenues	2,674.3	3,375.7	3,653.7
FUEL, PURCHASED POWER AND DIRECT TRANSMISSION EXPENSE	911.7	1,662.4	2,127.6
OPERATING EXPENSES
Other operation and maintenance	505.0	491.9	464.7
Depreciation and amortization	506.6	460.9	416.0
Taxes other than income	99.4	98.0	99.3
Operating expenses	1,111.0	1,050.8	980.0
OPERATING INCOME	651.6	662.5	546.1
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	19.4	6.9	6.7
Other net periodic benefit income (expense)	6.5	1.2	(4.3)
Other income	23.9	6.5	7.1
Other expense	(6.3)	(3.4)	(1.8)
Net other income	43.5	11.2	7.7
INTEREST EXPENSE
Interest on long-term debt	200.4	157.4	152.7
Allowance for borrowed funds used during construction	(7.1)	(4.0)	(3.5)
Interest on short-term debt and other interest charges	6.6	4.4	2.8
Interest expense	199.9	157.8	152.0
INCOME BEFORE TAXES	495.2	515.9	401.8
INCOME TAX EXPENSE	68.8	76.4	41.8
NET INCOME	426.4	439.5	360.0
Other comprehensive income, net of tax	0.0	0.0	0.0
Comprehensive income	$ 426.4	$ 439.5	$ 360.0