Investment in Unconsolidated Affiliate (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Activity in unconsolidated affiliates
Contributions	$ 73.8	$ 25.8	$ 5.7
Equity in income	(19.9)	20.4	18.9
EnLink Midstream Partners, LP
Activity in unconsolidated affiliates
Contributions	73.8	25.8	5.7
Distributions	57.7	42.7	23.7
Equity in income	(19.9)	20.4	$ 18.9
Investment in equity investment	$ 270.4	$ 274.3
EnLink Midstream Partners, LP \| Gulf Coast Fractionators
Unconsolidated affiliates
Equity method investment ownership (as a percent)	38.75%	38.75%	38.75%
Activity in unconsolidated affiliates
Distributions	$ 7.5	$ 14.5	$ 11.0
Equity in income	3.4	13.0	$ 17.1
Investment in equity investment	$ 48.5	$ 52.6
EnLink Midstream Partners, LP \| Howard Energy Partners
Unconsolidated affiliates
Equity method investment ownership (as a percent)	31.00%	31.00%	31.00%
Sale consideration of ownership interest	$ 193.1
Impairment of investment	20.1
Activity in unconsolidated affiliates
Contributions	45.0	$ 25.8	$ 5.7
Distributions	50.2	28.2	12.7
Equity in income	(23.3)	7.4	$ 1.8
Investment in equity investment	193.1	$ 221.7
Preferred Units \| EnLink Midstream Partners, LP \| Howard Energy Partners
Activity in unconsolidated affiliates
Contributions	32.7
Distributions	$ 32.7
Cedar Cove \| EnLink Midstream Partners, LP
Unconsolidated affiliates
Equity method investment ownership (as a percent)	30.00%
Activity in unconsolidated affiliates
Contributions	$ 28.8
Investment in equity investment	$ 28.8

Amount of sale consideration as per the agreement entered into during the reporting period.

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

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Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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