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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 | Dec. 31, 2022 | Dec. 31, 2021
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | $ 4,548.6 | $ 4,496.4
Redeemable Noncontrolling Interest, Equity, Carrying Amount | 0.0 | 785.1
Equity Securities, FV-NI, Current | 0.0 | 785.1
OGE Energy Senior Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 499.9 | 499.9
Long-Term Debt, Fair Value | 491.2 | 497.8
OGE Energy Term Loan [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 49.8 | 0.0
Long-Term Debt, Fair Value | 50.0 | 0.0
OG&E Senior Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 3,854.2 | 3,851.8
Long-Term Debt, Fair Value | 3,477.1 | 4,460.2
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 | 9.3 | 9.3
Long-Term Debt, Fair Value | $ 7.3 | $ 10.0

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