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Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Equity method investments
Distributions	$ 0.1	$ 0.2	$ 3.7	$ 2.0
Loss from unconsolidated affiliates	(1.3)	(0.7)	(7.6)	1.0
Total investment in unconsolidated affiliates	$ 30.7		$ 30.7		$ 41.6
GCF
Equity method investments
Ownership interest	38.75%		38.75%
Distributions	$ 0.0	0.0	$ 3.5	1.6
Loss from unconsolidated affiliates	$ (0.7)	0.3	$ (6.4)	2.1
Cedar Cove JV
Equity method investments
Ownership interest	30.00%		30.00%
Distributions	$ 0.1	0.2	$ 0.2	0.4
Loss from unconsolidated affiliates	(0.6)	$ (1.0)	(1.2)	$ (1.1)
EnLink Midstream Partners, LP
Equity method investments
Total investment in unconsolidated affiliates	30.3		30.3		41.6
EnLink Midstream Partners, LP \| GCF
Equity method investments
Total investment in unconsolidated affiliates	30.7		30.7		40.6
EnLink Midstream Partners, LP \| Cedar Cove JV
Equity method investments
Total investment in unconsolidated affiliates	$ (0.4)		$ (0.4)		$ 1.0