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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Payment Arrangement, Cost by Plan [Table Text Block] | 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 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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