UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities:
Net income	$ 1,362.6	$ 1,375.0
Reconciliation of net income to net cash flows provided by operating activities:
Depreciation and accretion	425.4	414.0
Amortization of intangible assets	36.1	39.6
Amortization of major maintenance costs for reaction-based plants	2.6	0.0
Other amortization expense	60.9	55.4
Impairment of assets other than goodwill	65.6	1.6
Equity in income of unconsolidated affiliates	(148.9)	(140.8)
Distributions received from unconsolidated affiliates attributable to earnings	111.9	126.9
Net losses attributable to asset sales and related matters	10.9	0.1
Deferred income tax expense (benefit)	4.6	(184.1)
Change in fair market value of derivative instruments	(15.6)	(29.5)
Change in fair market value of Liquidity Option	0.0	2.3
Non-cash expense related to long-term operating leases	9.3	10.0
Net effect of changes in operating accounts	99.0	341.7
Other operating activities	(1.3)	0.0
Net cash flows provided by operating activities	2,023.1	2,012.2
Investing activities:
Capital expenditures	(679.0)	(1,079.5)
Investments in unconsolidated affiliates	(1.3)	(3.3)
Distributions received from unconsolidated affiliates attributable to the return of capital	18.6	10.3
Proceeds from asset sales	6.2	0.6
Other investing activities	(1.5)	0.2
Cash used in investing activities	(657.0)	(1,071.7)
Financing activities:
Borrowings under debt agreements	7,531.8	5,411.8
Repayments of debt	(8,741.8)	(3,406.6)
Debt issuance costs	0.0	(28.4)
Monetization of interest rate derivative instruments	75.2	(33.3)
Cash distributions paid to common unitholders	(981.7)	(974.2)
Cash payments made in connection with distribution equivalent rights	(7.0)	(5.8)
Cash distributions paid to noncontrolling interests	(29.8)	(29.9)
Cash contributions from noncontrolling interests	13.1	5.2
Repurchase of common units under 2019 Buyback Program	(13.9)	(140.1)
Other financing activities	(35.7)	(33.6)
Cash provided by (used in) financing activities	(2,189.8)	765.1
Net change in cash and cash equivalents, including restricted cash	(823.7)	1,705.6
Cash and cash equivalents, including restricted cash, at beginning of period	1,158.1	410.0
Cash and cash equivalents, including restricted cash, at end of period	$ 334.4	$ 2,115.6