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Leases - Schedule of Financial Statement Information of Lease Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Leased Assets [Line Items]      
Operating lease cost $ 4.7 $ 6.4 $ 5.9
Operating cash flows for operating leases 4.5 5.2 5.3
Right-of-use assets obtained in exchange for new operating lease liabilities 5.7 0.0 1.5
Right-of-use assets at period end [1] $ 28.3 $ 25.9  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, Plant and Equipment, Net Property, Plant and Equipment, Net  
Operating lease liabilities at period end [2] $ 32.7 $ 30.5  
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Liabilities, Other than Long-Term Debt, Noncurrent Liabilities, Other than Long-Term Debt, Noncurrent  
Operating lease weighted-average remaining lease term (in years) 9 years 8 months 12 days 11 years 4 months 24 days  
Operating lease weighted-average discount rate 4.20% 4.00%  
OG&E [Member]      
Operating Leased Assets [Line Items]      
Operating lease cost $ 4.7 $ 6.4 5.9
Operating cash flows for operating leases 4.5 5.2 5.3
Right-of-use assets obtained in exchange for new operating lease liabilities 5.7 0.0 $ 1.5
Right-of-use assets at period end [1] $ 28.3 $ 25.9  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, Plant and Equipment, Net Property, Plant and Equipment, Net  
Operating lease liabilities at period end [2] $ 32.7 $ 30.5  
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Liabilities, Other than Long-Term Debt, Noncurrent Liabilities, Other than Long-Term Debt, Noncurrent  
Operating lease weighted-average remaining lease term (in years) 9 years 8 months 12 days 11 years 4 months 24 days  
Operating lease weighted-average discount rate 4.20% 4.00%  
[1] Included in Property, Plant and Equipment in the Registrants' balance sheets.
[2] Included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.