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Fair Value Measurements - Summary of Financial Instrument Measured at Fair Value On A Recurring Basis and Carrying Amount and Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
OGE Energy Senior Notes [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total long-term debt |  | $ 346.8 | $ 0.0
Long-Term Debt, Fair Value |  | 352.7 | 0.0
OGE Energy Term Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total long-term debt |  | 59.7 | 49.9
Long-Term Debt, Fair Value |  | 60.0 | 50.0
OG&E Senior Notes [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total long-term debt |  | 4,147.6 | 4,146.0
Long-Term Debt, Fair Value |  | 3,831.3 | 3,922.3
OG&E Revolving Credit Facility [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total long-term debt |  | 200.0 | 0.0
Long-Term Debt, Fair Value |  | 200.0 | 0.0
OG&E Industrial Authority Bonds [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total long-term debt |  | 135.4 | 135.4
Long-Term Debt, Fair Value |  | 135.4 | 135.4
OG&E Tinker Debt [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total long-term debt | [1] | 11.7 | 9.2
Long-Term Debt, Fair Value | [1] | $ 9.3 | $ 7.1
[1] | In June 2024, OG&E purchased additional distribution assets at Tinker Air Force Base for $2.6 million, which was a non-cash investing and financing activity.

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