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Derivatives - Components of Commodity Swap Gain (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivatives        
Change in fair value of derivatives $ (23.8) $ (18.8) $ (31.7) $ (5.8)
Realized gain (loss) on derivatives     (34.2) (6.0)
Loss on derivative activity (38.2) (22.4) (121.6) (3.2)
Commodity swaps        
Derivatives        
Realized gain (loss) on derivatives (14.4) (3.6) (89.9) 2.6
EnLink Midstream Partners, LP | Commodity swaps        
Derivatives        
Change in fair value of derivatives (23.8) (18.8) (31.7) (5.8)
Realized gain (loss) on derivatives (14.4) (3.6) (89.9) 2.6
Loss on derivative activity $ (38.2) $ (22.4) $ (121.6) $ (3.2)