Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Equity method investments
Proceeds from sale of unconsolidated affiliate investment	$ 189.7	$ 0.2
Contributions	6.0	7.1
Equity in income (loss)	0.7	(2.4)
Total investment in unconsolidated affiliates	$ 84.5		$ 77.3
Gulf Coast Fractionators
Equity method investments
Ownership interest	38.75%		38.75%
Howard Energy Partners
Equity method investments
Ownership interest			31.00%
Proceeds from sale of unconsolidated affiliate investment	$ 189.7
Cedar Cove JV
Equity method investments
Ownership interest	30.00%		30.00%
EnLink Midstream Partners, LP
Equity method investments
Contributions	$ 6.0	7.1
Distributions	2.9	9.2
Equity in income (loss)	0.7	(2.4)
Total investment in unconsolidated affiliates	84.5		$ 270.4
EnLink Midstream Partners, LP \| Gulf Coast Fractionators
Equity method investments
Contributions	0.0	0.0
Distributions	2.7	3.0
Equity in income (loss)	4.0	(1.7)
Total investment in unconsolidated affiliates	49.8		48.5
EnLink Midstream Partners, LP \| Howard Energy Partners
Equity method investments
Contributions	0.0	7.1
Distributions	0.0	6.2
Equity in income (loss)	(3.4)	(0.7)
Total investment in unconsolidated affiliates	0.0		193.1
EnLink Midstream Partners, LP \| Cedar Cove JV
Equity method investments
Contributions	6.0	0.0
Distributions	0.2	0.0
Equity in income (loss)	0.1	$ 0.0
Total investment in unconsolidated affiliates	$ 34.7		$ 28.8

This element represents disclosure of the aggregate cash dividends paid to the entity by unconsolidated subsidiaries.

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