UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED EQUITY - USD ($) $ in Millions	Total	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]	Limited Partners [Member]	Treasury Units [Member]
Balance at Dec. 31, 2018	$ 24,292.2	$ 50.9	$ 438.7	$ 23,802.6
Increase (Decrease) in Partners' Equity [Roll Forward]
Net income	2,516.9	0.0	41.7	2,475.2
Cash distributions paid to limited partners	(1,907.9)	0.0	0.0	(1,907.9)
Cash payments made in connection with distribution equivalent rights	(10.5)	0.0	0.0	(10.5)
Cash distributions paid to noncontrolling interests	(46.9)	0.0	(46.9)	0.0
Cash contributions from noncontrolling interests	99.6	0.0	99.6	0.0
Net cash proceeds from the issuance of common units	82.2	0.0	0.0	82.2
Common units issued in connection with employee compensation	45.6	0.0	0.0	45.6
Amortization of fair value of equity-based awards	70.5	0.0	0.0	70.5
Repurchase and cancellation of common units under 2019 Buyback Program	(81.1)	0.0	0.0	(81.1)
Cash flow hedges	(61.0)	(61.0)	0.0	0.0
Other, net	(24.2)	(0.6)	2.5	(26.1)
Balance at Jun. 30, 2019	24,975.4	(10.7)	535.6	24,450.5
Balance at Mar. 31, 2019	24,521.3	(94.0)	463.4	24,151.9
Increase (Decrease) in Partners' Equity [Roll Forward]
Net income	1,236.5	0.0	21.8	1,214.7
Cash distributions paid to limited partners	(957.5)	0.0	0.0	(957.5)
Cash payments made in connection with distribution equivalent rights	(6.0)	0.0	0.0	(6.0)
Cash distributions paid to noncontrolling interests	(28.9)	0.0	(28.9)	0.0
Cash contributions from noncontrolling interests	64.8	0.0	64.8	0.0
Net cash proceeds from the issuance of common units	39.5	0.0	0.0	39.5
Amortization of fair value of equity-based awards	38.5	0.0	0.0	38.5
Repurchase and cancellation of common units under 2019 Buyback Program	(29.5)	0.0	0.0	(29.5)
Cash flow hedges	83.3	83.3	0.0	0.0
Other, net	13.4	0.0	14.5	(1.1)
Balance at Jun. 30, 2019	24,975.4	(10.7)	535.6	24,450.5
Balance at Dec. 31, 2019	25,827.5	71.4	1,063.5	24,692.6	$ 0.0
Increase (Decrease) in Partners' Equity [Roll Forward]
Net income	2,435.8	0.0	51.0	2,384.8	0.0
Cash distributions paid to limited partners	(1,946.9)	0.0	0.0	(1,946.9)	0.0
Cash payments made in connection with distribution equivalent rights	(12.9)	0.0	0.0	(12.9)	0.0
Cash distributions paid to noncontrolling interests	(61.8)	0.0	(61.8)	0.0	0.0
Cash contributions from noncontrolling interests	19.7	0.0	19.7	0.0	0.0
Amortization of fair value of equity-based awards	80.6	0.0	0.0	80.6	0.0
Repurchase and cancellation of common units under 2019 Buyback Program	(140.1)	0.0	0.0	(140.1)	0.0
Common units issued in connection with settlement of Liquidity Option	1,297.3	0.0	0.0	1,297.3	0.0
Treasury units acquired in connection with settlement of Liquidity Option, at cost	(1,297.3)	0.0	0.0	0.0	(1,297.3)
Cash flow hedges	(218.4)	(218.4)	0.0	0.0	0.0
Other, net	(42.1)	(0.1)	(7.7)	(34.3)	0.0
Balance at Jun. 30, 2020	25,941.4	(147.1)	1,064.7	26,321.1	(1,297.3)
Balance at Mar. 31, 2020	26,114.2	122.3	1,063.8	26,225.4	(1,297.3)
Increase (Decrease) in Partners' Equity [Roll Forward]
Net income	1,060.8	0.0	26.1	1,034.7	0.0
Cash distributions paid to limited partners	(972.7)	0.0	0.0	(972.7)	0.0
Cash payments made in connection with distribution equivalent rights	(7.1)	0.0	0.0	(7.1)	0.0
Cash distributions paid to noncontrolling interests	(31.9)	0.0	(31.9)	0.0	0.0
Cash contributions from noncontrolling interests	14.5	0.0	14.5	0.0	0.0
Amortization of fair value of equity-based awards	41.5	0.0	0.0	41.5	0.0
Cash flow hedges	(269.4)	(269.4)	0.0	0.0	0.0
Other, net	(8.5)	0.0	(7.8)	(0.7)	0.0
Balance at Jun. 30, 2020	$ 25,941.4	$ (147.1)	$ 1,064.7	$ 26,321.1	$ (1,297.3)