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Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]                  
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity $ 1,346.4           $ 1,346.4   $ 652.5
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 25.50%     25.50%     25.50% 25.50%  
Proportionate Unconsolidated Affiliate Net Income $ (44.0)     $ 31.2     $ (8.9) $ 89.4  
Equity in Earnings Amortization of Basis Difference [1] 59.8     7.1     85.1 15.4  
Income (Loss) from Equity Method Investments, Total 15.8     38.3     (703.8) [2] 104.8  
Asset Impairment Charges 0.0     0.0     780.0 0.0  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 177.4 $ 85.9 $ (491.8) 250.9 $ 100.2 $ 47.1 (228.5) 398.2  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]                  
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]                  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ (173.0)     $ 123.0     $ (35.0) $ 351.1  
OGE Holdings [Member]                  
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]                  
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest             25.50%    
OGE Energy [Member]                  
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]                  
Equity in Earnings Amortization of Basis Difference [3]             $ 86.1    
[1] Includes loss on dilution, net of proportional basis difference recognition.(B) For the three and nine months ended September 30, 2020, Enable recorded a $225.0 million impairment on its SESH equity method investment, which is included in their net loss for each period. Enable estimated the fair value of this equity method investment was below the carrying value at September 30, 2020 and concluded the decline in value was other than temporary due to the expiration of a transportation contract and the current status of renewal negotiations. The impairment ran through OGE Energy's portion of Enable net income (loss) and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above.
[2] In March 2020, the Company recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 4 and 5.
[3] Includes proportional basis difference recognition due to dilution.