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Derivatives - Components of Gain (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivatives    
Gain (loss) on derivative activity $ 2.8 $ (0.4)
EnLink Midstream Partners, LP | Commodity Swaps    
Derivatives    
Change in fair value of derivatives 5.3 (6.0)
Realized gain (loss) on derivatives (2.5) 5.6
Gain (loss) on derivative activity $ 2.8 $ (0.4)