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Retirement Plans and Postretirement Benefit Plans - Schedule of Capitalized Pension and Postretirement Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Capitalized portion of net periodic pension benefit cost $ 0.6 $ 0.5 $ 1.8 $ 1.6
Pension Plan [Member] | OG&E [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Capitalized portion of net periodic pension benefit cost 0.6 0.5 1.8 1.6
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Capitalized portion of net periodic pension benefit cost 0.0 0.0 0.0 0.1
Other Postretirement Benefits Plan [Member] | OG&E [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Capitalized portion of net periodic pension benefit cost $ 0.0 $ 0.0 $ 0.0 $ 0.1