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Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Equity method investments
Proceeds from sale of unconsolidated affiliate investment				$ 189.7	$ 0.0
Contributions		$ 1.5	$ 3.2	11.8	45.0
Distributions		4.0	37.4	11.4	52.3
Equity in income (loss)		4.4	1.1	5.0	(0.5)
Total investment in unconsolidated affiliates		$ 86.1		$ 86.1		$ 77.3
Gulf Coast Fractionators
Equity method investments
Ownership interest		38.75%		38.75%		38.75%
Contributions		$ 0.0	0.0	$ 0.0	0.0
Distributions		3.5	0.9	10.6	4.4
Equity in income (loss)		4.5	2.2	8.5	1.1
Howard Energy Partners
Equity method investments
Ownership interest						31.00%
Proceeds from sale of unconsolidated affiliate investment	$ 189.7
Contributions		0.0	3.2	0.0	45.0
Distributions		0.0	36.5	0.0	47.9
Equity in income (loss)		$ 0.0	(1.1)	$ (3.4)	(1.6)
Cedar Cove JV
Equity method investments
Ownership interest		30.00%		30.00%		30.00%
Contributions		$ 1.5	0.0	$ 11.8	0.0
Distributions		0.5	0.0	0.8	0.0
Equity in income (loss)		(0.1)	0.0	(0.1)	0.0
EnLink Midstream Partners, LP
Equity method investments
Total investment in unconsolidated affiliates		86.1		86.1		$ 270.4
EnLink Midstream Partners, LP \| Gulf Coast Fractionators
Equity method investments
Total investment in unconsolidated affiliates		46.4		46.4		48.5
EnLink Midstream Partners, LP \| Howard Energy Partners
Equity method investments
Total investment in unconsolidated affiliates		0.0		0.0		193.1
EnLink Midstream Partners, LP \| Cedar Cove JV
Equity method investments
Total investment in unconsolidated affiliates		$ 39.7		$ 39.7		$ 28.8
Preferred Units \| Howard Energy Partners
Equity method investments
Contributions			3.2		32.7
Distributions			$ 32.7		$ 32.7