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Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity method investments
Contributions		$ 0.0	$ 0.1	$ 12.6
Distributions		20.2	22.7	13.5
Equity in income (loss)		(16.8)	13.3	9.6
Proceeds from sale of unconsolidated affiliate investment		0.0	0.0	189.7
Tangible asset impairment charges		$ 7.9		17.1
Gulf Coast Fractionators
Equity method investments
Ownership interest		38.75%
Distributions		$ 19.2	22.3	12.7
Equity in income (loss)		16.5	15.8	12.6
Howard Energy Partners
Equity method investments
Ownership interest	31.00%
Equity in income (loss)		$ 0.0	0.0	(3.4)
Loss on disposal of HEP interests				3.4
Proceeds from sale of unconsolidated affiliate investment	$ 189.7
Cedar Cove JV
Equity method investments
Ownership interest		30.00%
Contributions		$ 0.0	0.1	12.6
Distributions		1.0	0.4	0.8
Equity in income (loss)		(33.3)	(2.5)	$ 0.4
EnLink Midstream Partners, LP
Equity method investments
Total investment in unconsolidated affiliates		43.1	$ 80.1
EnLink Midstream Partners, LP \| Gulf Coast Fractionators
Equity method investments
Ownership interest			38.75%	38.75%
Total investment in unconsolidated affiliates		39.2	$ 41.9
EnLink Midstream Partners, LP \| Cedar Cove JV
Equity method investments
Ownership interest			30.00%	30.00%
Total investment in unconsolidated affiliates		3.9	$ 38.2
Cedar Cove JV
Equity method investments
Tangible asset impairment charges		$ 31.4