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Derivatives - Components of Gain (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivatives    
Gain on derivative activity $ 0.5 $ 2.8
EnLink Midstream Partners, LP | Commodity Swaps    
Derivatives    
Change in fair value of derivatives (3.5) 5.3
Realized gain (loss) on derivatives 4.0 (2.5)
Gain on derivative activity $ 0.5 $ 2.8