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Investment in Unconsolidated Affiliates (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
May 01, 2013
Expected Settlement Charge $ 12.7      
Limited Partner Units Owned 111.0      
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.31800      
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 25.50% 25.60%    
Equity in earnings of unconsolidated affiliates $ 30.7 $ 33.9    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 670.4   $ 680.3  
Enogex LLC [Member]        
Increase in fair value of net assets       $ 2,200.0
Enable Midstream Partners [Member]        
Distributions from unconsolidated affiliates $ 35.3 $ 35.3    
OGE Holdings [Member]        
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 25.50%      
Enable Midstream Partners [Member]        
Share Price $ 14.32