Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 320,000,000	$ (888,200,000)	$ (1,409,700,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairments	17,100,000	873,300,000	1,563,400,000
Depreciation and amortization	545,300,000	503,900,000	387,300,000
Loss on disposition of assets	0	13,200,000	1,200,000
Gain on extinguishment of debt	(9,000,000)	0	0
Deferred tax expense (benefit)	(197,200,000)	2,100,000	22,600,000
Non-cash unit-based compensation	48,100,000	30,300,000	36,100,000
(Gain) loss on derivatives recognized in net income (loss)	4,200,000	11,100,000	(9,400,000)
Cash settlements on derivatives	(11,200,000)	10,500,000	17,100,000
Amortization of debt issue costs, net (premium) discount of notes and installment payable	29,300,000	53,400,000	400,000
Distribution of earnings from unconsolidated affiliates	13,300,000	3,100,000	21,600,000
(Income) loss from unconsolidated affiliates	(9,600,000)	19,900,000	(20,400,000)
Other operating activities	600,000	900,000	(1,200,000)
Changes in assets and liabilities net of assets acquired and liabilities assumed:
Accounts receivable, accrued revenue and other	(189,400,000)	(118,100,000)	197,500,000
Natural gas and NGLs inventory, prepaid expenses and other	(23,500,000)	18,700,000	(6,700,000)
Accounts payable, accrued gas and crude oil purchases and other accrued liabilities	162,100,000	132,300,000	(171,400,000)
Net cash provided by operating activities	700,100,000	666,400,000	628,400,000
Cash flows from investing activities, net of assets acquired and liabilities assumed:
Additions to property and equipment	(790,800,000)	(663,000,000)	(572,300,000)
Acquisition of business, net of cash acquired	0	(791,500,000)	(524,200,000)
Proceeds from insurance settlement	400,000	300,000	2,900,000
Proceeds from sale of unconsolidated affiliate investment	189,700,000	0	0
Proceeds from sale of property	2,300,000	93,100,000	1,000,000
Investment in unconsolidated affiliates	(12,600,000)	(73,800,000)	(25,800,000)
Distribution from unconsolidated affiliates in excess of earnings	200,000	54,600,000	21,100,000
Net cash used in investing activities	(610,800,000)	(1,380,300,000)	(1,097,300,000)
Cash flows from financing activities:
Proceeds from borrowings	2,381,800,000	2,150,400,000	3,204,400,000
Payments on borrowings	(2,123,400,000)	(1,917,500,000)	(2,134,300,000)
Payment of installment payable for EnLink Oklahoma T.O. acquisition	(250,000,000)	0	0
Debt financing costs	(5,500,000)	(4,700,000)	(9,600,000)
Proceeds from issuance of ENLK common units	106,900,000	167,500,000	24,400,000
Distributions to non-controlling interest	(433,700,000)	(384,200,000)	(359,500,000)
Distribution to members	(186,000,000)	(185,400,000)	(162,800,000)
Distribution to Devon for VEX interests transferred (Note 3)	0	0	(166,700,000)
Contributions by non-controlling interest	57,300,000	167,900,000	16,400,000
Contribution from Devon	1,300,000	1,500,000	27,800,000
Other financing activities	(12,500,000)	(12,000,000)	(21,600,000)
Net cash provided by (used in) financing activities	(69,800,000)	707,600,000	418,500,000
Net increase (decrease) in cash and cash equivalents	19,500,000	(6,300,000)	(50,400,000)
Cash and cash equivalents, beginning of period	11,700,000	18,000,000	68,400,000
Cash and cash equivalents, end of period	31,200,000	11,700,000	18,000,000
Cash paid for interest	165,900,000	133,700,000	110,000,000
Cash paid (refunded) for income taxes	3,300,000	(7,000,000)	13,700,000
Series B Preferred Units
Cash flows from financing activities:
Proceeds from issuance of ENLK Preferred Units	0	724,100,000	0
Series C Preferred Units
Cash flows from financing activities:
Proceeds from issuance of ENLK Preferred Units	$ 394,000,000	$ 0	$ 0