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Investment in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Equity method investments          
Distributions $ 0.2 $ 7.6 $ 2.0 $ 10.1  
Equity in income (loss) (0.7) 4.7 1.0 10.0  
Total investment in unconsolidated affiliates $ 42.1   $ 42.1   $ 43.1
GCF          
Equity method investments          
Ownership interest 38.75%   38.75%    
Distributions $ 0.0 7.4 $ 1.6 9.6  
Equity in income (loss) $ 0.3 5.2 $ 2.1 10.9  
Cedar Cove JV          
Equity method investments          
Ownership interest 30.00%   30.00%    
Distributions $ 0.2 0.2 $ 0.4 0.5  
Equity in income (loss) (1.0) $ (0.5) (1.1) $ (0.9)  
EnLink Midstream Partners, LP          
Equity method investments          
Total investment in unconsolidated affiliates 42.1   42.1   43.1
EnLink Midstream Partners, LP | GCF          
Equity method investments          
Total investment in unconsolidated affiliates 39.7   39.7   39.2
EnLink Midstream Partners, LP | Cedar Cove JV          
Equity method investments          
Total investment in unconsolidated affiliates $ 2.4   $ 2.4   $ 3.9