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Stock-Based Compensation - Schedule of Pre-tax Compensation Expense and Related Income Tax Benefit (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense $ 3.2 $ 2.3 $ 9.5 $ 6.9
Income tax benefit 0.8 0.5 2.3 1.7
OG&E [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense 0.7 0.8 2.2 2.3
Income tax benefit 0.2 0.2 0.5 0.6
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense 0.9 0.6 2.7 1.6
Restricted Stock Units (RSUs) [Member] | OG&E [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense 0.2 0.2 0.6 0.6
Total Shareholder Return [Member] | Performance Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense 2.3 1.7 6.8 5.3
Total Shareholder Return [Member] | Performance Units [Member] | OG&E [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense $ 0.5 $ 0.6 $ 1.6 $ 1.7