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Leases - Schedule of Maturity Analysis of Operating Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Operating Leased Assets [Line Items]    
2024 $ 3.7  
2025 3.5  
2026 3.0  
2027 3.0  
2028 3.1  
Thereafter 22.6  
Total future minimum lease payments 38.9  
Less: Imputed interest 8.4  
Present value of net minimum lease payments [1] 30.5 $ 34.8
OG&E [Member]    
Operating Leased Assets [Line Items]    
2024 3.7  
2025 3.5  
2026 3.0  
2027 3.0  
2028 3.1  
Thereafter 22.6  
Total future minimum lease payments 38.9  
Less: Imputed interest 8.4  
Present value of net minimum lease payments [1] $ 30.5 $ 34.8
[1] Included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.