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Related Party Disclosures (Details) - USD ($)
$ in Millions
11 Months Ended 12 Months Ended
Dec. 02, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]        
Expected Settlement Charge   $ 19.4    
Excluding Fuel Purchases [Member]        
Related Party Transaction [Line Items]        
Accounts receivable - unconsolidated affiliates   0.3 $ 2.0  
Og and E [Member]        
Related Party Transaction [Line Items]        
Dividends, Common Stock   (265.0)   $ (325.0)
Og and E [Member] | Retained Earnings        
Related Party Transaction [Line Items]        
Dividends, Common Stock   265.0 0.0 325.0
Enable Midstream Partners [Member] | Og and E [Member]        
Related Party Transaction [Line Items]        
Revenue from Related Parties $ 13.3   15.1 15.9
Enable Midstream Partners [Member] | Og and E [Member] | Natural Gas Transportation [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Purchases from Related Party 32.7   32.8 41.2
Enable Midstream Partners [Member] | Og and E [Member] | Natural Gas Purchases [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Purchases from Related Party $ (33.5)   2.7 (6.0)
Enable Midstream Partners [Member] | OGE Energy [Member] | Operating Costs Charged [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party   0.3 0.4 0.5
Enable Midstream Partners [Member] | OGE Energy [Member] | Employment Costs [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party   12.2 17.3 23.2
Og and E [Member] | OGE Energy [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party   $ 139.3 $ 140.6 $ 149.8