Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 159.3	$ 36.4
Adjustments to reconcile net income to net cash provided by operating activities:
Impairments	0.0	7.0
Depreciation and amortization	283.4	270.8
Non-cash unit-based compensation	14.7	28.7
(Gain) loss on derivatives recognized in net income	14.7	(4.4)
Gain on extinguishment of debt	0.0	(9.0)
Cash settlements on derivatives	(0.4)	(6.0)
Amortization of debt issue costs, net discount (premium) of notes and installment payable	2.5	14.3
Distribution of earnings from unconsolidated affiliates	9.5	0.0
Income from unconsolidated affiliates	(7.4)	(0.6)
Non-cash revenue from contract restructuring	(45.5)	0.0
Other operating activities	13.2	5.8
Changes in assets and liabilities, net of assets acquired and liabilities assumed:
Accounts receivable, accrued revenue, and other	(46.7)	56.2
Natural gas and NGLs inventory, prepaid expenses, and other	(40.1)	(34.0)
Accounts payable, accrued gas and crude oil purchases, and other accrued liabilities	72.1	(36.1)
Net cash provided by operating activities	429.3	329.1
Cash flows from investing activities:
Additions to property and equipment	(404.4)	(471.7)
Proceeds from sale of unconsolidated affiliate investment	0.0	189.7
Investment in unconsolidated affiliates	(0.1)	(10.3)
Distribution from unconsolidated affiliates in excess of earnings	1.9	7.4
Other investing activities	0.8	1.3
Net cash used in investing activities	(401.8)	(283.6)
Cash flows from financing activities:
Proceeds from borrowings	1,361.8	1,800.2
Payments on borrowings	(832.0)	(1,384.9)
Payment of installment payable for EOGP acquisition	(250.0)	(250.0)
Debt financing costs	0.0	(5.7)
Conversion of restricted units, net of units withheld for taxes	(3.5)	(4.8)
Conversion of ENLK's restricted units, net of units withheld for taxes	(3.4)	(5.1)
Proceeds from issuance of ENLK common units	0.9	72.2
Distribution to members	(95.7)	(92.9)
Distributions to non-controlling partners	(255.5)	(202.9)
Contributions by non-controlling interests	54.3	28.5
Other financing activities	1.2	(0.4)
Net cash used in financing activities	(21.9)	(45.8)
Net increase (decrease) in cash and cash equivalents	5.6	(0.3)
Cash and cash equivalents, beginning of period	31.2	11.7
Cash and cash equivalents, end of period	36.8	11.4
Supplemental disclosures of cash flow information:
Cash paid for interest	89.1	79.1
Cash paid for income taxes	0.4	3.6
Non-cash investing activities:
Non-cash accrual of property and equipment	(5.0)	(5.2)
Discounted secured term loan receivable from contract restructuring	$ 47.7	$ 0.0