CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	OG&E [Member]	Common Stock	Common Stock OG&E [Member]	Premium on Common Stock	Premium on Common Stock OG&E [Member]	Retained Earnings	Retained Earnings OG&E [Member]	Accumulated Other Comprehensive (Loss) Income
Balance at Dec. 31, 2023	$ 4,511.6	$ 4,974.7	$ 2.0	$ 100.9	$ 1,143.1	$ 1,476.8	$ 3,373.7	$ 3,397.0	$ (7.2)
Common Stock, Shares, Outstanding at Dec. 31, 2023			200,300,000	40,400,000
Changes in Stockholders' Equity
Net income	18.6	25.2	$ 0.0	$ 0.0	0.0	0.0	18.6	25.2	0.0
Net income, Number of Shares			0	0
Other comprehensive income, net of tax	3.9		$ 0.0		0.0		0.0		3.9
Other comprehensive income, net of tax, Number of Shares			0
Dividends declared on common stock	(86.1)		$ 0.0		0.0		(86.1)		0.0
Dividends declared on common stock, Number of Shares			0
Stock-based compensation	(2.7)	3.2	$ 0.0	$ 0.0	(2.7)	3.2	0.0	0.0	0.0
Stock-based compensation, Number of Shares			200,000	0
Balance at Mar. 31, 2024	4,445.3	5,003.1	$ 2.0	$ 100.9	1,140.4	1,480.0	3,306.2	3,422.2	(3.3)
Common Stock, Shares, Outstanding at Mar. 31, 2024			200,500,000	40,400,000
Balance at Dec. 31, 2023	4,511.6	4,974.7	$ 2.0	$ 100.9	1,143.1	1,476.8	3,373.7	3,397.0	(7.2)
Common Stock, Shares, Outstanding at Dec. 31, 2023			200,300,000	40,400,000
Changes in Stockholders' Equity
Net income	120.9	134.5					120.9
Other comprehensive income, net of tax		0.0
Balance at Jun. 30, 2024	4,477.7	5,115.8	$ 2.0	$ 100.9	1,154.5	1,483.4	3,324.4	3,531.5	(3.2)
Common Stock, Shares, Outstanding at Jun. 30, 2024			200,900,000	40,400,000
Balance at Mar. 31, 2024	4,445.3	5,003.1	$ 2.0	$ 100.9	1,140.4	1,480.0	3,306.2	3,422.2	(3.3)
Common Stock, Shares, Outstanding at Mar. 31, 2024			200,500,000	40,400,000
Changes in Stockholders' Equity
Net income	102.3	109.3	$ 0.0	$ 0.0	0.0	0.0	102.3	109.3	0.0
Net income, Number of Shares			0	0
Other comprehensive income, net of tax	0.1	0.0	$ 0.0		0.0		0.0		0.1
Other comprehensive income, net of tax, Number of Shares			0
Dividends declared on common stock	(84.1)		$ 0.0		0.0		(84.1)		0.0
Dividends declared on common stock, Number of Shares			0
Issuance of common stock	10.9		$ 0.0		10.9		0.0		0.0
Issuance of common stock, Number of Shares			400,000
Stock-based compensation	3.2	3.4	$ 0.0	$ 0.0	3.2	3.4	0.0	0.0	0.0
Stock-based compensation, Number of Shares			0	0
Balance at Jun. 30, 2024	4,477.7	5,115.8	$ 2.0	$ 100.9	1,154.5	1,483.4	3,324.4	3,531.5	(3.2)
Common Stock, Shares, Outstanding at Jun. 30, 2024			200,900,000	40,400,000
Balance at Dec. 31, 2024	4,640.9	5,326.4	$ 2.0	$ 100.9	1,165.9	1,488.6	3,475.7	3,736.9	(2.7)
Common Stock, Shares, Outstanding at Dec. 31, 2024			201,000,000	40,400,000
Changes in Stockholders' Equity
Net income	62.7	71.0	$ 0.0	$ 0.0	0.0	0.0	62.7	71.0	0.0
Net income, Number of Shares			0	0
Other comprehensive income, net of tax	0.1		$ 0.0		0.0		0.0		0.1
Other comprehensive income, net of tax, Number of Shares			0
Dividends declared on common stock	(86.8)		$ 0.0		0.0		(86.8)		0.0
Dividends declared on common stock, Number of Shares			0
Issuance of common stock	3.1		$ 0.0		3.1		0.0		0.0
Issuance of common stock, Number of Shares			100,000
Stock-based compensation	(4.3)	3.0	$ 0.0	$ 0.0	(4.3)	3.0	0.0	0.0	0.0
Stock-based compensation, Number of Shares			200,000	0
Balance at Mar. 31, 2025	4,615.7	5,400.4	$ 2.0	$ 100.9	1,164.7	1,491.6	3,451.6	3,807.9	(2.6)
Common Stock, Shares, Outstanding at Mar. 31, 2025			201,300,000	40,400,000
Balance at Dec. 31, 2024	4,640.9	5,326.4	$ 2.0	$ 100.9	1,165.9	1,488.6	3,475.7	3,736.9	(2.7)
Common Stock, Shares, Outstanding at Dec. 31, 2024			201,000,000	40,400,000
Changes in Stockholders' Equity
Net income	$ 170.2	178.7					170.2
Other comprehensive income, net of tax		0.0
Issuance of common stock, Number of Shares	234,476
Balance at Jun. 30, 2025	$ 4,644.9	5,661.7	$ 2.0	$ 100.9	1,171.2	1,645.2	3,474.2	3,915.6	(2.5)
Common Stock, Shares, Outstanding at Jun. 30, 2025			201,400,000	40,400,000
Balance at Mar. 31, 2025	4,615.7	5,400.4	$ 2.0	$ 100.9	1,164.7	1,491.6	3,451.6	3,807.9	(2.6)
Common Stock, Shares, Outstanding at Mar. 31, 2025			201,300,000	40,400,000
Changes in Stockholders' Equity
Net income	107.5	107.7	$ 0.0	$ 0.0	0.0	0.0	107.5	107.7	0.0
Net income, Number of Shares			0	0
Capital contribution from OGE Energy		150.0		$ 0.0		150.0		0.0
Capital contribution from OGE Energy, Number of Shares				0
Other comprehensive income, net of tax	0.1	0.0	$ 0.0		0.0		0.0		0.1
Other comprehensive income, net of tax, Number of Shares			0
Dividends declared on common stock	(84.9)		$ 0.0		0.0		(84.9)		0.0
Dividends declared on common stock, Number of Shares			0
Issuance of common stock	2.9		$ 0.0		2.9		0.0		0.0
Issuance of common stock, Number of Shares			100,000
Stock-based compensation	3.6	3.6	$ 0.0	$ 0.0	3.6	3.6	0.0	0.0	0.0
Stock-based compensation, Number of Shares			0	0
Balance at Jun. 30, 2025	$ 4,644.9	$ 5,661.7	$ 2.0	$ 100.9	$ 1,171.2	$ 1,645.2	$ 3,474.2	$ 3,915.6	$ (2.5)
Common Stock, Shares, Outstanding at Jun. 30, 2025			201,400,000	40,400,000