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Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			27,278
Stock-Based Compensation Activity
Income tax benefit	$ 0.5	$ 0.6	$ 1.7	$ 1.8
OG&E [Member]
Stock-Based Compensation Activity
Income tax benefit	0.2	0.1	0.6	0.4
Restricted stock units
Stock-Based Compensation Activity
Compensation expense	0.6	0.4	1.6	1.3
Restricted stock units | OG&E [Member]
Stock-Based Compensation Activity
Compensation expense	0.2	0.1	0.6	0.2
Share-based Payment Arrangement [Member]
Stock-Based Compensation Activity
Compensation expense	2.3	2.3	6.9	7.1
Share-based Payment Arrangement [Member] | OG&E [Member]
Stock-Based Compensation Activity
Compensation expense	0.8	0.6	2.3	1.6
Total Shareholder Return [Member] | Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense	1.7	1.9	5.3	5.8
Total Shareholder Return [Member] | Performance Shares [Member] | OG&E [Member]
Stock-Based Compensation Activity
Compensation expense	$ 0.6	$ 0.5	$ 1.7	$ 1.4

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- Definition

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

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