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Leases - Schedule of Maturity Analysis of Operating Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Operating Leased Assets [Line Items]    
2023 $ 5.7  
2024 3.7  
2025 3.5  
2026 3.0  
2027 3.0  
Thereafter 25.7  
Total future minimum lease payments 44.6  
Less: Imputed interest 9.8  
Present value of net minimum lease payments [1] 34.8 $ 37.6
OG&E [Member]    
Operating Leased Assets [Line Items]    
2023 5.7  
2024 3.7  
2025 3.5  
2026 3.0  
2027 3.0  
Thereafter 25.7  
Total future minimum lease payments 44.6  
Less: Imputed interest 9.8  
Present value of net minimum lease payments [1] $ 34.8 $ 37.6
[1] Included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.