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Stock-Based Compensation - Schedule of Pre-tax Compensation Expense and Related Income Tax Benefit (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	$ 2.1	$ 3.2	$ 8.6	$ 9.5
Income tax benefit	0.5	0.8	2.1	2.3
OG&E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	2.1	0.7	8.6	2.2
Income tax benefit	0.5	0.2	2.1	0.5
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	1.4	2.3	5.8	6.8
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	0.7	0.9	2.8	2.7
Restricted Stock Units (RSUs) [Member] | OG&E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	0.7	0.2	2.8	0.6
Total Shareholder Return [Member] | Performance Units [Member] | OG&E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	$ 1.4	$ 0.5	$ 5.8	$ 1.6

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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