STATEMENTS OF CONSOLIDATED EQUITY - USD ($) $ in Millions	Total	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]	Limited Partners [Member]
Balance at Dec. 31, 2012	$ 13,296.0	$ (370.4)	$ 108.3	$ 13,558.1
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	2,607.1	0.0	10.2	2,596.9
Cash distributions paid to limited partners	(2,400.3)	0.0	0.0	(2,400.3)
Cash distributions paid to noncontrolling interests	(8.9)	0.0	(8.9)	0.0
Cash contributions from noncontrolling interests	115.4	0.0	115.4	0.0
Net cash proceeds from the issuance of common units	1,792.0	0.0	0.0	1,792.0
Amortization of fair value of equity-based awards	72.4	0.0	0.0	72.4
Cash flow hedges	11.0	11.0	0.0	0.0
Other	(44.3)	0.4	0.6	(45.3)
Balance at Dec. 31, 2013	15,440.4	(359.0)	225.6	15,573.8
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	2,833.5	0.0	46.1	2,787.4
Cash distributions paid to limited partners	(2,638.1)	0.0	0.0	(2,638.1)
Cash payments made in connection with distribution equivalent rights	(3.7)	0.0	0.0	(3.7)
Cash distributions paid to noncontrolling interests	(48.6)	0.0	(48.6)	0.0
Cash contributions from noncontrolling interests	4.0	0.0	4.0	0.0
Common units issued and noncontrolling interests acquired in connection with Step 1 of Oiltanking acquisition	3,568.7	0.0	1,397.2	2,171.5
Net cash proceeds from the issuance of common units	388.8	0.0	0.0	388.8
Amortization of fair value of equity-based awards	87.0	0.0	5.2	81.8
Cash flow hedges	117.0	117.0	0.0	0.0
Other	(56.8)	0.4	(0.5)	(56.7)
Balance at Dec. 31, 2014	19,692.2	(241.6)	1,629.0	18,304.8
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	2,558.4	0.0	37.2	2,521.2
Cash distributions paid to limited partners	(2,943.7)	0.0	0.0	(2,943.7)
Cash payments made in connection with distribution equivalent rights	(7.7)	0.0	0.0	(7.7)
Cash distributions paid to noncontrolling interests	(48.0)	0.0	(48.0)	0.0
Cash contributions from noncontrolling interests	54.0	0.0	54.0	0.0
Common units issued in connection with Step 2 of Oiltanking acquisition	0.0	0.0	(1,408.7)	1,408.7
Removal of noncontrolling interests in connection with sale of Offshore Business	(62.1)	0.0	(62.1)	0.0
Net cash proceeds from the issuance of common units	1,188.6	0.0	0.0	1,188.6
Amortization of fair value of equity-based awards	92.4	0.0	0.0	92.4
Cash flow hedges	22.0	22.0	0.0	0.0
Other	(45.0)	0.4	4.6	(50.0)
Balance at Dec. 31, 2015	$ 20,501.1	$ (219.2)	$ 206.0	$ 20,514.3