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Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity method investments
Proceeds from sale of unconsolidated affiliate investment		$ 0.0	$ 189.7	$ 0.0
Contributions		0.1	12.6	73.8
Distributions		22.7	13.5	57.7
Equity in income (loss)		13.3	9.6	(19.9)
Gulf Coast Fractionators
Equity method investments
Distributions		22.3	12.7	7.5
Equity in income (loss)		15.8	12.6	3.4
Howard Energy Partners
Equity method investments
Proceeds from sale of unconsolidated affiliate investment	$ 189.7
Contributions		0.0	0.0	45.0
Distributions		0.0	0.0	50.2
Equity in income (loss)		0.0	(3.4)	(23.3)
Cedar Cove JV
Equity method investments
Contributions		0.1	12.6	28.8
Distributions		0.4	0.8	0.0
Equity in income (loss)		(2.5)	0.4	$ 0.0
EnLink Midstream Partners, LP
Equity method investments
Total investment in unconsolidated affiliates		$ 80.1	$ 89.4
EnLink Midstream Partners, LP \| Gulf Coast Fractionators
Equity method investments
Ownership interest		38.75%	38.75%	38.75%
Total investment in unconsolidated affiliates		$ 41.9	$ 48.4
EnLink Midstream Partners, LP \| Howard Energy Partners
Equity method investments
Ownership interest			31.00%
Loss on disposal of HEP interests		$ 3.4	$ 20.1
EnLink Midstream Partners, LP \| Cedar Cove JV
Equity method investments
Ownership interest		30.00%	30.00%	30.00%
Total investment in unconsolidated affiliates		$ 38.2	$ 41.0
Preferred Units \| EnLink Midstream Partners, LP \| Howard Energy Partners
Equity method investments
Contributions			32.7
Distributions			$ 32.7