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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Stock-Based Compensation Activity |  |  |  |
Income tax benefit | $ 0.6 | $ 0.6 | $ 1.2 | $ 1.1
Treasury Stock, Shares, Acquired |  |  | 154,344 |
OG&E [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Income tax benefit | 0.2 | 0.2 | $ 0.3 | 0.4
Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 1.9 | 2.1 | 3.9 | 4.0
Performance Shares [Member] | Total Shareholder Return [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 1.9 | 2.0 | 3.9 | 3.7
Performance Shares [Member] | Performance Units Related to Earnings Per Share [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.0 | 0.1 | 0.0 | 0.3
Performance Shares [Member] | OG&E [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.5 | 0.6 | 0.9 | 1.4
Performance Shares [Member] | OG&E [Member] | Total Shareholder Return [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.5 | 0.6 | 0.9 | 1.3
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 | 0.2 | 0.9 | 0.3
Restricted stock units | OG&E [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.1 | 0.1 | 0.1 | 0.2
Share-based Payment Arrangement [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 2.3 | 2.3 | 4.8 | 4.3
Share-based Payment Arrangement [Member] | OG&E [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | $ 0.6 | $ 0.7 | $ 1.0 | $ 1.6

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