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Derivatives - Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Derivatives    
Fair value of derivative assets—current $ 9.6 $ 12.9
Fair value of derivative assets—long-term 5.4 4.3
Fair value of derivative liabilities—current (33.1) (14.4)
EnLink Midstream Partners, LP    
Derivatives    
Fair value of derivative assets—current 9.6 12.9
Fair value of derivative assets—long-term 5.4 4.3
Fair value of derivative liabilities—current (14.6) (8.8)
Net fair value of commodity swaps $ 0.4 $ 8.4