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Fair Value Measurements Carrying and Fair Value Amounts (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity Securities, FV-NI, Cost | [1] | $ 382.0 | $ 785.1
Equity Securities, FV-NI | [1] | 382.0 | 785.1
OG&E Senior Notes [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-Term Debt, Carrying Amount |  | 3,853.0 | 3,851.8
Long-Term Debt, Fair Value |  | 3,720.9 | 4,460.2
OG&E Industrial Authority Bonds [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-Term Debt, Carrying Amount |  | 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] |  |  |
Long-Term Debt, Carrying Amount |  | 9.3 | 9.3
Long-Term Debt, Fair Value |  | 7.8 | 10.0
Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-Term Debt, Carrying Amount |  | 499.9 | 499.9
Long-Term Debt, Fair Value |  | 487.3 | 497.8
Term Loan |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-Term Debt, Carrying Amount |  | 49.8 | 0.0
Long-Term Debt, Fair Value |  | 50.0 | 0.0
Fair Value, Recurring [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  | $ 0.0 | $ 0.0
[1] | As of June 30, 2022, OGE Energy has sold 57.1 million of the 95.4 million Energy Transfer limited partner units it received as a result of the merger transaction between Enable and Energy Transfer in December 2021.

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- Definition Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value. + References No definition available. + Details
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