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Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Equity method investments
Distributions	$ 0.1	$ 0.0	$ 3.8	$ 2.0
Income (loss) from unconsolidated affiliates	(2.3)	(0.2)	(9.9)	0.8
Total investment in unconsolidated affiliates	$ 29.0		$ 29.0		$ 41.6
GCF
Equity method investments
Ownership interest	38.75%		38.75%
Distributions	$ 0.0	0.0	$ 3.5	1.6
Income (loss) from unconsolidated affiliates	$ (1.7)	0.4	$ (8.1)	2.5
Cedar Cove JV
Equity method investments
Ownership interest	30.00%		30.00%
Distributions	$ 0.1	0.0	$ 0.3	0.4
Income (loss) from unconsolidated affiliates	(0.6)	$ (0.6)	(1.8)	$ (1.7)
EnLink Midstream Partners, LP
Equity method investments
Total investment in unconsolidated affiliates	27.9		27.9		41.6
EnLink Midstream Partners, LP \| GCF
Equity method investments
Total investment in unconsolidated affiliates	29.0		29.0		40.6
EnLink Midstream Partners, LP \| Cedar Cove JV
Equity method investments
Total investment in unconsolidated affiliates	$ (1.1)		$ (1.1)		$ 1.0