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Common Equity (Tables) | 3 Months Ended
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Mar. 31, 2022
Equity [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table presents the calculation of basic and diluted earnings per share for OGE Energy.
|  | Three Months Ended March 31,
(In millions except per share data) |  |  | 2022 | 2021
Net income |  |  | $ | 279.5 |  | $ | 52.7 |
Average common shares outstanding: |  |  |  |
Basic average common shares outstanding |  |  | 200.2 |  | 200.1 |
Effect of dilutive securities: |  |  |  |
Contingently issuable shares (performance and restricted stock units) |  |  | 0.4 |  | — |
Diluted average common shares outstanding |  |  | 200.6 |  | 200.1 |
Basic earnings per average common share |  |  | $ | 1.40 |  | $ | 0.26 |
Diluted earnings per average common share |  |  | $ | 1.39 |  | $ | 0.26 |
Anti-dilutive shares excluded from earnings per share calculation |  |  | — |  | — |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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