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Common Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table presents the calculation of basic and diluted earnings (loss) per share for OGE Energy.
| Three Months Ended September 30, | Nine Months Ended September 30,
(In millions except per share data) | 2021 | 2020 | 2021 | 2020
Net income (loss) | $ | 252.5 |  | $ | 177.4 |  | $ | 418.1 |  | $ | (228.5) |
Average common shares outstanding: |  |  |  |
Basic average common shares outstanding | 200.2 |  | 200.1 |  | 200.1 |  | 200.1 |
Effect of dilutive securities: |  |  |  |
Contingently issuable shares (performance and restricted stock units) | 0.2 |  | 0.3 |  | 0.2 |  | — |
Diluted average common shares outstanding | 200.4 |  | 200.4 |  | 200.3 |  | 200.1 |
Basic earnings (loss) per average common share | $ | 1.26 |  | $ | 0.89 |  | $ | 2.09 |  | $ | (1.14) |
Diluted earnings (loss) per average common share | $ | 1.26 |  | $ | 0.89 |  | $ | 2.09 |  | $ | (1.14) |
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 http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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