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Leases - Schedule of Maturity Analysis of Operating Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Operating Leased Assets [Line Items]    
2025 $ 4.9  
2026 4.3  
2027 4.3  
2028 4.3  
2029 3.2  
Thereafter 19.5  
Total future minimum lease payments 40.5  
Less: Imputed interest 7.8  
Present value of net minimum lease payments [1] 32.7 $ 30.5
OG&E [Member]    
Operating Leased Assets [Line Items]    
2025 4.9  
2026 4.3  
2027 4.3  
2028 4.3  
2029 3.2  
Thereafter 19.5  
Total future minimum lease payments 40.5  
Less: Imputed interest 7.8  
Present value of net minimum lease payments [1] $ 32.7 $ 30.5
[1] Included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.