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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Share-based Payment Arrangement [Text Block] | Stock-Based Compensation The following table presents the Registrants' pre-tax compensation expense and related income tax benefit for the three months ended March 31, 2021 and 2020 related to performance units and restricted stock units for the Registrants' employees.
|  |  | OGE Energy |  |  |  | OG&E
|  | Three Months Ended March 31, |  |  |  | Three Months Ended March 31,
(In millions) |  |  | 2021 | 2020 |  |  |  | 2021 | 2020
Performance units: |  |  |  |  |  |  |  |  |
Total shareholder return |  |  | $ | 2.0 |  | $ | 1.7 |  |  |  |  | $ | 0.4 |  | $ | 0.7 |
Earnings per share |  |  | — |  | 0.2 |  |  |  |  | — |  | 0.1 |
Total performance units |  |  | 2.0 |  | 1.9 |  |  |  |  | 0.4 |  | 0.8 |
Restricted stock units |  |  | 0.5 |  | 0.1 |  |  |  |  | — |  | 0.1 |
Total compensation expense |  |  | $ | 2.5 |  | $ | 2.0 |  |  |  |  | $ | 0.4 |  | $ | 0.9 |
Income tax benefit |  |  | $ | 0.6 |  | $ | 0.5 |  |  |  |  | $ | 0.1 |  | $ | 0.2 |
During the three months ended March 31, 2021, OGE Energy issued 153,964 shares of its treasury stock to satisfy payouts of earned performance units and restricted stock unit grants to the Registrants' employees pursuant to OGE Energy's Stock Incentive Plan. During the three months ended March 31, 2021, OGE Energy granted 249,909 performance units (based on total shareholder return over a three-year period) and 86,963 restricted stock units (primarily a three-year cliff vesting period) to employees at $38.06 and $31.03 fair value per share, respectively. Of those performance units and restricted stock units granted, 68,720 and 22,911 were granted to OG&E employees, respectively, at $38.14 and $30.91 fair value per share, respectively.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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