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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 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 and nine months ended September 30, 2021 and 2020 related to performance units and restricted stock units for the Registrants' employees.
| OGE Energy |  | OG&E
| Three Months Ended September 30, | Nine Months Ended September 30, |  | Three Months Ended September 30, | Nine Months Ended September 30,
(In millions) | 2021 | 2020 | 2021 | 2020 |  | 2021 | 2020 | 2021 | 2020
Performance units: |  |  |  |  |  |  |  |  |
Total shareholder return | $ | 1.9 |  | $ | 1.9 |  | $ | 5.8 |  | $ | 5.6 |  |  | $ | 0.5 |  | $ | 0.5 |  | $ | 1.4 |  | $ | 1.8 |
Earnings per share | — |  | 0.2 |  | — |  | 0.5 |  |  | — |  | — |  | — |  | 0.1 |
Total performance units | 1.9 |  | 2.1 |  | 5.8 |  | 6.1 |  |  | 0.5 |  | 0.5 |  | 1.4 |  | 1.9 |
Restricted stock units | 0.4 |  | 0.3 |  | 1.3 |  | 0.6 |  |  | 0.1 |  | 0.1 |  | 0.2 |  | 0.3 |
Total compensation expense | $ | 2.3 |  | $ | 2.4 |  | $ | 7.1 |  | $ | 6.7 |  |  | $ | 0.6 |  | $ | 0.6 |  | $ | 1.6 |  | $ | 2.2 |
Income tax benefit | $ | 0.6 |  | $ | 0.6 |  | $ | 1.8 |  | $ | 1.7 |  |  | $ | 0.1 |  | $ | 0.2 |  | $ | 0.4 |  | $ | 0.6 |
During the nine months ended September 30, 2021, OGE Energy issued 154,523 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.

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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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- References No definition available. + Details
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