Income Taxes Income Taxes (Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 07, 2014
Operating Loss Carryforwards [Line Items]
Business acquisition, deferred tax liability, assumed in business acquisition			$ 254.6
Business Acquisition, Deferred tax liability, Percentage of total assumed			53.00%
Deferred Tax Assets, Inventory	0.2
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	1.2
Deferred Tax Asset, Asset Retirement Obligations	1.6
Deferred Tax Assets, Operating Loss Carryforwards	56.1
Deferred Tax Assets, Net	59.1
Deferred Tax Liabilities, Property, Plant and Equipment	(525.2)
Deferred Tax Liabilities, Other	(8.1)
Deferred Tax Liabilities, Other Liabilities	(2.2)
Deferred Tax Liabilities, Gross	(535.5)
Deferred Tax Liabilities, Net	(476.4)
Business Acquisition, Percentage of Voting Interests Acquired			50.00%
Income Tax Expense (Benefit)	23.7	13.4
Enlink midstream, LLC [Member]
Operating Loss Carryforwards [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			50.00%
EnLink Midstream Holdings, LP [Member]
Operating Loss Carryforwards [Line Items]
Business Acquisition, Additional Percentage of Voting Interests Acquired			3.00%
Business Acquisition, Percentage of Voting Interests Acquired			50.00%
Noncontrolling Interest
Operating Loss Carryforwards [Line Items]
Business acquisition, deferred tax liability, assumed in business acquisition			207.2
Business Acquisition, Deferred tax liability, Percentage of total assumed			47.00%
Predecessor
Operating Loss Carryforwards [Line Items]
Income Tax Expense (Benefit)	19.4
Enlink midstream, LLC [Member]
Operating Loss Carryforwards [Line Items]
Income Tax Expense (Benefit)	$ 4.3