Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ 29.8	$ 9.1	$ (230.6)	$ (125.7)
Adjustments to reconcile net loss to net cash provided by operating activities:
Impairments	1.5	0.0	354.5	186.5
Depreciation and amortization	158.2	153.7	321.0	305.8
Loss on secured term loan receivable	0.0	52.9	0.0	52.9
Deferred income tax benefit	11.3	(5.7)	(22.7)	(4.9)
Non-cash unit-based compensation			16.2	19.1
(Gain) loss on derivatives recognized in net loss	22.4	(6.9)	3.2	(8.7)
Cash settlements on derivatives			2.8	4.9
Gain on extinguishment of debt	(26.7)	0.0	(32.0)	0.0
Amortization of debt issue costs, net discount (premium) of notes			2.2	2.9
Distribution of earnings from unconsolidated affiliates			1.2	9.7
Income from unconsolidated affiliates	0.7	(4.7)	(1.0)	(10.0)
Other operating activities			4.1	(3.0)
Changes in assets and liabilities:
Accounts receivable, accrued revenue, and other			109.8	270.7
Natural gas and NGLs inventory, prepaid expenses, and other			9.3	(7.4)
Accounts payable, accrued product purchases, and other accrued liabilities			(221.2)	(171.3)
Net cash provided by operating activities			316.8	521.5
Cash flows from investing activities:
Additions to property and equipment			(203.6)	(428.4)
Other investing activities			1.6	1.5
Net cash used in investing activities			(202.0)	(426.9)
Cash flows from financing activities:
Proceeds from borrowings			490.0	2,320.0
Payments on borrowings			(476.0)	(2,131.4)
Debt financing costs			0.0	(9.7)
Conversion of restricted units, net of units withheld for taxes			(4.3)	(8.4)
Distribution to members			(139.8)	(188.2)
Distributions to non-controlling interests			(60.6)	(162.7)
Contributions by non-controlling interests			50.3	45.2
Other financing activities			0.2	(0.8)
Net cash used in financing activities			(140.2)	(136.0)
Net decrease in cash and cash equivalents			(25.4)	(41.4)
Cash and cash equivalents, beginning of period			77.4	100.4
Cash and cash equivalents, end of period	$ 52.0	$ 59.0	52.0	59.0
Supplemental disclosures of cash flow information:
Cash paid for interest			106.6	103.7
Cash paid (refunded) for income taxes			(1.0)	1.2
Non-cash investing activities:
Non-cash accrual of property and equipment			(19.6)	(5.8)
Right-of-use assets obtained in exchange for operating lease liabilities			4.8	95.2
Redemption of non-controlling interest			$ (4.0)	$ 0.0