Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Equity method investments
Distributions	$ 6.0	$ 2.9
Equity in income (loss)	3.0	0.7
Contributions	0.0	6.0
Total investment in unconsolidated affiliates	$ 86.4		$ 89.4
GCF
Equity method investments
Ownership interest	38.75%
Distributions	$ 5.7	2.7
Equity in income (loss)	4.6	4.0
HEP
Equity method investments
Equity in income (loss)	$ 0.0	(3.4)
Cedar Cove JV
Equity method investments
Ownership interest	30.00%
Distributions	$ 0.3	0.2
Equity in income (loss)	(1.6)	0.1
Contributions	0.0	$ 6.0
EnLink Midstream Partners, LP
Equity method investments
Total investment in unconsolidated affiliates	86.4		89.4
EnLink Midstream Partners, LP \| GCF
Equity method investments
Total investment in unconsolidated affiliates	47.3		48.4
EnLink Midstream Partners, LP \| Cedar Cove JV
Equity method investments
Total investment in unconsolidated affiliates	$ 39.1		$ 41.0

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

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