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Stock-Based Compensation - Schedule of Pre-tax Compensation Expense and Related Income Tax Benefit (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense | $ 9.7 | $ 9.8 | $ 9.8 |
Income tax benefit | 2.3 | 2.5 | 2.5 |
OG&E [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense | 2.9 | 2.2 | 3.0 |
Income tax benefit | 0.7 | 0.6 | 0.8 |
Performance Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense | 7.2 | 7.5 | 8.9 |
Performance Units [Member] | OG&E [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense | 2.2 | 1.8 | 2.6 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense | 2.5 | 2.3 | 0.9 |
Restricted Stock Units (RSUs) [Member] | OG&E [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense | 0.7 | 0.4 | 0.4 |
Total Shareholder Return [Member] | Performance Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense | 7.2 | 7.5 | 7.9 |
Total Shareholder Return [Member] | Performance Units [Member] | OG&E [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense | 2.2 | 1.8 | 2.3 |
Performance Units Related to Earnings Per Share [Member] | Performance Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense | 0.0 | 0.0 | 1.0 | [1]
Performance Units Related to Earnings Per Share [Member] | Performance Units [Member] | OG&E [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense | $ 0.0 | $ 0.0 | $ 0.3 | [1]
[1] | In 2019, the Compensation Committee of OGE Energy's Board of Directors voted to grant restricted stock units in lieu of performance units based on earnings per share. The final grants of performance units based on earnings per share vested as of December 31, 2020 and were paid out in March 2021.

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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