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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
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

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