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Common Equity (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Schedule of Earnings Per Share Basic and Diluted | The following table presents the calculation of basic and diluted earnings (loss) per share for OGE Energy.
(In millions except per share data) |  | 2022 |  |  | 2021 |  |  | 2020 |
Net income (loss) |  | $ | 665.7 |  |  | $ | 737.3 |  |  | $ | (173.7 | )
Average common shares outstanding: |  |  |  |  |  |  |  |  |
Basic average common shares outstanding |  |  | 200.2 |  |  |  | 200.1 |  |  |  | 200.1 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
Contingently issuable shares (performance and restricted stock units) |  |  | 0.6 |  |  |  | 0.2 |  |  |  | — |
Diluted average common shares outstanding |  |  | 200.8 |  |  |  | 200.3 |  |  |  | 200.1 |
Basic earnings (loss) per average common share |  | $ | 3.33 |  |  | $ | 3.68 |  |  | $ | (0.87 | )
Diluted earnings (loss) per average common share |  | $ | 3.32 |  |  | $ | 3.68 |  |  | $ | (0.87 | )
Anti-dilutive shares excluded from earnings per share calculation |  |  | — |  |  |  | — |  |  |  | 0.3 |

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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