XML 55 R43.htm IDEA: XBRL DOCUMENT v3.21.1
Investment in Unconsolidated Affiliates (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Expected Settlement Charge $ 18.3    
Limited Partner Units Owned 111.0    
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.16525    
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 25.50% 25.50%  
Equity in earnings (losses) of unconsolidated affiliates $ 53.2 $ (746.5) [1]  
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 1,318.6   $ 1,332.3
Enable Midstream Partners [Member]      
Distributions from unconsolidated affiliates $ 18.3 $ 36.7  
OGE Holdings [Member]      
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 25.50%    
Energy Transfer      
Common Stock, Terms of Conversion 0.8595    
Enable Midstream Partners [Member]      
Share Price $ 6.48    
[1] In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4