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Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Equity method investments
Distributions	$ 0.0	$ 5.4	$ 2.0	$ 15.5
Equity in income (loss)	(0.2)	4.0	0.8	14.0
Total investment in unconsolidated affiliates	$ 41.9		$ 41.9		$ 43.1
GCF
Equity method investments
Ownership interest	38.75%		38.75%
Distributions	$ 0.0	5.1	$ 1.6	14.7
Equity in income (loss)	$ 0.4	4.4	$ 2.5	15.3
Cedar Cove JV
Equity method investments
Ownership interest	30.00%		30.00%
Distributions	$ 0.0	0.3	$ 0.4	0.8
Equity in income (loss)	(0.6)	$ (0.4)	(1.7)	$ (1.3)
EnLink Midstream Partners, LP
Equity method investments
Total investment in unconsolidated affiliates	41.9		41.9		43.1
EnLink Midstream Partners, LP \| GCF
Equity method investments
Total investment in unconsolidated affiliates	40.1		40.1		39.2
EnLink Midstream Partners, LP \| Cedar Cove JV
Equity method investments
Total investment in unconsolidated affiliates	$ 1.8		$ 1.8		$ 3.9