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Derivatives - Components of Commodity Swap Gain (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivatives        
Change in fair value of interest rate swaps $ 5.3 $ 35.3 $ 3.9 $ 20.2
Gain (loss) on derivative activity 11.3 4.5 23.2 (26.7)
Commodity swaps        
Derivatives        
Change in fair value of interest rate swaps 5.3 35.3    
Realized gain (loss) on derivatives 6.0 (30.8)    
Gain (loss) on derivative activity $ 11.3 $ 4.5    
EnLink Midstream Partners, LP | Commodity swaps        
Derivatives        
Change in fair value of interest rate swaps     3.9 20.2
Realized gain (loss) on derivatives     19.3 (46.9)
Gain (loss) on derivative activity     $ 23.2 $ (26.7)