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Common Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
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.
(In millions except per share data) | 2020 | 2019 | 2018
Net income (loss) | $ | (173.7) |  | $ | 433.6 |  | $ | 425.5 |
Average common shares outstanding: |  |  |
Basic average common shares outstanding | 200.1 |  | 200.1 |  | 199.7 |
Effect of dilutive securities: |  |  |
Contingently issuable shares (performance and restricted stock units) | — |  | 0.6 |  | 0.8 |
Diluted average common shares outstanding | 200.1 |  | 200.7 |  | 200.5 |
Basic earnings (loss) per average common share | $ | (0.87) |  | $ | 2.17 |  | $ | 2.13 |
Diluted earnings (loss) per average common share | $ | (0.87) |  | $ | 2.16 |  | $ | 2.12 |
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=6371337&loc=d3e3550-109257 + Details
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