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Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 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 $ 1,406.2       $ 1,406.2   $ 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 $ 8.8   $ 29.3   $ 35.1 $ 58.2  
Equity in Earnings Amortization of Basis Difference [1] 18.1   6.5   25.3 8.3  
Income (Loss) from Equity Method Investments, Total 26.9   35.8   (719.6) [2] 66.5  
Asset Impairment Charges 0.0   0.0   (780.0) 0.0  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 85.9 $ (491.8) 100.2 $ 47.1 (405.9) 147.3  
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 $ 35.0   $ 114.8   $ 138.0 $ 228.1  
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]         $ 26.3    
[1] Includes loss on dilution, net of proportional basis difference recognition.
[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.