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Common Equity (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, | Nine Months Ended September 30,
(In millions, except per share data) | 2022 | 2021 | 2022 | 2021
Net income | $ | 262.8 |  | $ | 252.5 |  | $ | 615.4 |  | $ | 418.1 |
Average common shares outstanding: |  |  |  |
Basic average common shares outstanding | 200.2 |  | 200.2 |  | 200.2 |  | 200.1 |
Effect of dilutive securities: |  |  |  |
Contingently issuable shares (performance and restricted stock units) | 0.7 |  | 0.2 |  | 0.5 |  | 0.2 |
Diluted average common shares outstanding | 200.9 |  | 200.4 |  | 200.7 |  | 200.3 |
Basic earnings per average common share | $ | 1.31 |  | $ | 1.26 |  | $ | 3.07 |  | $ | 2.09 |
Diluted earnings per average common share | $ | 1.31 |  | $ | 1.26 |  | $ | 3.07 |  | $ | 2.09 |
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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