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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock-Based Compensation Activity |  |  |  |
Income tax benefit | $ 0.6 | $ 0.6 | $ 1.8 | $ 1.7
Treasury Stock, Shares, Acquired |  |  | 154,523 |
OG&E [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Income tax benefit | 0.1 | 0.2 | $ 0.4 | 0.6
Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 1.9 | 2.1 | 5.8 | 6.1
Performance Shares [Member] | Total Shareholder Return [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 1.9 | 1.9 | 5.8 | 5.6
Performance Shares [Member] | Performance Units Related to Earnings Per Share [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.0 | 0.2 | 0.0 | 0.5
Performance Shares [Member] | OG&E [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.5 | 0.5 | 1.4 | 1.9
Performance Shares [Member] | OG&E [Member] | Total Shareholder Return [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.5 | 0.5 | 1.4 | 1.8
Performance Shares [Member] | OG&E [Member] | Performance Units Related to Earnings Per Share [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.0 | 0.0 | 0.0 | 0.1
Restricted stock units |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.4 | 0.3 | 1.3 | 0.6
Restricted stock units | OG&E [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.1 | 0.1 | 0.2 | 0.3
Share-based Payment Arrangement [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 2.3 | 2.4 | 7.1 | 6.7
Share-based Payment Arrangement [Member] | OG&E [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | $ 0.6 | $ 0.6 | $ 1.6 | $ 2.2

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