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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity method investments
Proceeds from sale of unconsolidated affiliate investment		$ 189.7	$ 0.0	$ 0.0
Contributions		12.6	73.8	25.8
Distributions		13.5	57.7	42.7
Equity in income		9.6	(19.9)	20.4
Gulf Coast Fractionators
Equity method investments
Contributions		0.0	0.0	0.0
Distributions		12.7	7.5	14.5
Equity in income		12.6	3.4	13.0
Howard Energy Partners
Equity method investments
Proceeds from sale of unconsolidated affiliate investment	$ 189.7
Contributions		0.0	45.0	25.8
Distributions		0.0	50.2	28.2
Equity in income		(3.4)	(23.3)	7.4
Cedar Cove JV
Equity method investments
Contributions		12.6	28.8	0.0
Distributions		0.8	0.0	0.0
Equity in income		0.4	0.0	$ 0.0
EnLink Midstream Partners, LP
Equity method investments
Total investment in unconsolidated affiliates		$ 89.4	$ 270.4
EnLink Midstream Partners, LP \| Gulf Coast Fractionators
Equity method investments
Ownership interest		38.75%	38.75%	38.75%
Total investment in unconsolidated affiliates		$ 48.4	$ 48.5
EnLink Midstream Partners, LP \| Howard Energy Partners
Equity method investments
Ownership interest			31.00%	31.00%
Loss on disposal of HEP interests		3.4	$ 20.1
Total investment in unconsolidated affiliates		$ 0.0	$ 193.1
EnLink Midstream Partners, LP \| Cedar Cove JV
Equity method investments
Ownership interest		30.00%	30.00%
Total investment in unconsolidated affiliates		$ 41.0	$ 28.8
Preferred Units \| EnLink Midstream Partners, LP \| Howard Energy Partners
Equity method investments
Contributions			32.7
Distributions			$ 32.7