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Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Equity method investments
Distributions	$ 5.4	$ 4.5	$ 11.4	$ 7.4
Equity in income (loss)	4.4	(0.1)	7.4	0.6
Contributions	0.1	4.3	0.1	10.3
Total investment in unconsolidated affiliates	$ 85.5		$ 85.5		$ 89.4
GCF
Equity method investments
Ownership interest	38.75%		38.75%
Distributions	$ 5.4	4.4	$ 11.1	7.1
Equity in income (loss)	4.8	0.0	9.4	4.0
HEP
Equity method investments
Equity in income (loss)	$ 0.0	0.0	$ 0.0	(3.4)
Cedar Cove JV
Equity method investments
Ownership interest	30.00%		30.00%
Distributions	$ 0.0	0.1	$ 0.3	0.3
Equity in income (loss)	(0.4)	(0.1)	(2.0)	0.0
Contributions	0.1	$ 4.3	0.1	$ 10.3
EnLink Midstream Partners, LP
Equity method investments
Total investment in unconsolidated affiliates	85.5		85.5		89.4
EnLink Midstream Partners, LP \| GCF
Equity method investments
Total investment in unconsolidated affiliates	46.7		46.7		48.4
EnLink Midstream Partners, LP \| Cedar Cove JV
Equity method investments
Total investment in unconsolidated affiliates	$ 38.8		$ 38.8		$ 41.0