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Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Stock-Based Compensation (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 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	$ 0.6	$ 0.6	$ 1.2	$ 1.2
OG&E [Member]
Stock-Based Compensation Activity
Income tax benefit	0.2	0.2	0.4	0.3
Restricted stock units
Stock-Based Compensation Activity
Compensation expense	0.5	0.4	1.0	0.9
Restricted stock units \| OG&E [Member]
Stock-Based Compensation Activity
Compensation expense	0.2	0.1	0.4	0.1
Share-based Payment Arrangement [Member]
Stock-Based Compensation Activity
Compensation expense	2.3	2.3	4.6	4.8
Share-based Payment Arrangement [Member] \| OG&E [Member]
Stock-Based Compensation Activity
Compensation expense	0.7	0.6	1.5	1.0
Total Shareholder Return [Member] \| Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense	1.8	1.9	3.6	3.9
Total Shareholder Return [Member] \| Performance Shares [Member] \| OG&E [Member]
Stock-Based Compensation Activity
Compensation expense	$ 0.5	$ 0.5	$ 1.1	$ 0.9