STATEMENTS OF CONSOLIDATED EQUITY - USD ($) $ in Millions	Total	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]	Limited Partners [Member]
Balance at Dec. 31, 2015	$ 20,501.1	$ (219.2)	$ 206.0	$ 20,514.3
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	2,553.0	0.0	39.9	2,513.1
Cash distributions paid to limited partners	(3,300.5)	0.0	0.0	(3,300.5)
Cash payments made in connection with distribution equivalent rights	(11.7)	0.0	0.0	(11.7)
Cash distributions paid to noncontrolling interests	(47.4)	0.0	(47.4)	0.0
Cash contributions from noncontrolling interests	20.4	0.0	20.4	0.0
Net cash proceeds from the issuance of common units	2,542.8	0.0	0.0	2,542.8
Amortization of fair value of equity-based awards	90.2	0.0	0.0	90.2
Cash flow hedges	(60.7)	(60.7)	0.0	0.0
Other	(21.2)	(0.1)	0.1	(21.2)
Balance at Dec. 31, 2016	22,266.0	(280.0)	219.0	22,327.0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	2,855.6	0.0	56.3	2,799.3
Cash distributions paid to limited partners	(3,569.9)	0.0	0.0	(3,569.9)
Cash payments made in connection with distribution equivalent rights	(15.1)	0.0	0.0	(15.1)
Cash distributions paid to noncontrolling interests	(49.2)	0.0	(49.2)	0.0
Cash contributions from noncontrolling interests	0.4	0.0	0.4	0.0
Net cash proceeds from the issuance of common units	1,073.4	0.0	0.0	1,073.4
Common units issued in connection with employee compensation	33.7	0.0	0.0	33.7
Amortization of fair value of equity-based awards	99.0	0.0	0.0	99.0
Cash flow hedges	108.4	108.4	0.0	0.0
Other	(29.9)	(0.1)	(1.3)	(28.5)
Balance at Dec. 31, 2017	22,772.4	(171.7)	225.2	22,718.9
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	4,238.5	0.0	66.1	4,172.4
Cash distributions paid to limited partners	(3,726.9)	0.0	0.0	(3,726.9)
Cash payments made in connection with distribution equivalent rights	(17.7)	0.0	0.0	(17.7)
Cash distributions paid to noncontrolling interests	(81.6)	0.0	(81.6)	0.0
Cash contributions from noncontrolling interests	238.1	0.0	238.1	0.0
Net cash proceeds from the issuance of common units	538.4	0.0	0.0	538.4
Common units issued in connection with employee compensation	39.1	0.0	0.0	39.1
Common units issued in connection with land acquisition	30.0	0.0	0.0	30.0
Common units acquired in connection with buyback program	(30.8)	0.0	0.0	(30.8)
Amortization of fair value of equity-based awards	104.7	0.0	0.0	104.7
Cash flow hedges	223.1	223.1	0.0	0.0
Other	(35.1)	(0.5)	(9.1)	(25.5)
Balance at Dec. 31, 2018	$ 24,292.2	$ 50.9	$ 438.7	$ 23,802.6