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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
Mar. 31, 2025
Dec. 31, 2024
OGE Energy Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt $ 347.2 $ 346.9
Long-Term Debt, Fair Value 358.1 355.7
OGE Energy Term Loan [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt 59.7 59.7
Long-Term Debt, Fair Value 60.0 60.0
OG&E Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt 4,500.2 4,499.6
Long-Term Debt, Fair Value 4,240.3 4,174.9
OG&E Revolving Credit Facility [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt 100.0 0.0
Long-Term Debt, Fair Value 100.0 0.0
OG&E Industrial Authority Bonds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt 103.0 135.4
Long-Term Debt, Fair Value 103.0 135.4
OG&E Tinker Debt [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt 11.7 11.7
Long-Term Debt, Fair Value $ 9.2 $ 9.0