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Investment in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Equity method investments      
Distributions $ 2.5 $ 6.0  
Equity in income (loss) 5.3 3.0  
Total investment in unconsolidated affiliates $ 82.9   $ 80.1
GCF      
Equity method investments      
Ownership interest 38.75%    
Distributions $ 2.2 5.7  
Equity in income (loss) $ 5.7 4.6  
Cedar Cove JV      
Equity method investments      
Ownership interest 30.00%    
Distributions $ 0.3 0.3  
Equity in income (loss) (0.4) $ (1.6)  
EnLink Midstream Partners, LP      
Equity method investments      
Total investment in unconsolidated affiliates 82.9   80.1
EnLink Midstream Partners, LP | GCF      
Equity method investments      
Total investment in unconsolidated affiliates 45.4   41.9
EnLink Midstream Partners, LP | Cedar Cove JV      
Equity method investments      
Total investment in unconsolidated affiliates $ 37.5   $ 38.2