Revenues, Revenues by Business Segment and Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018		Mar. 31, 2017
Revenue [Abstract]
Revenues	$ 9,298.5	[1]	$ 7,320.4	[2]
Sales of Products [Member] | Revenues [Member] | Product Concentration Risk [Member]
Revenue [Abstract]
Concentration risk percentage	86.00%		86.00%
Midstream Services [Member]
Revenue [Abstract]
Percentage increase in revenues due to addition of revenue stream for non-cash consideration	1.00%
Midstream Services [Member] | Revenues [Member] | Product Concentration Risk [Member]
Revenue [Abstract]
Concentration risk percentage	14.00%		14.00%
NGL Pipelines & Services [Member]
Revenue [Abstract]
Revenues	$ 3,413.3	[1]	$ 3,345.8	[2]
NGL Pipelines & Services [Member] | Sales of NGLs and Related Products [Member]
Revenue [Abstract]
Revenues	2,815.4	[1]	2,887.2	[2]
NGL Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	597.9	[1]	458.6	[2]
Crude Oil Pipelines & Services [Member]
Revenue [Abstract]
Revenues	3,570.9	[1]	1,807.2	[2]
Crude Oil Pipelines & Services [Member] | Sales of Crude Oil [Member]
Revenue [Abstract]
Revenues	3,341.7	[1]	1,618.6	[2]
Crude Oil Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	229.2	[1]	188.6	[2]
Natural Gas Pipelines & Services [Member]
Revenue [Abstract]
Revenues	804.8	[1]	761.2	[2]
Natural Gas Pipelines & Services [Member] | Sales of Natural Gas [Member]
Revenue [Abstract]
Revenues	560.0	[1]	544.0	[2]
Natural Gas Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	244.8	[1]	217.2	[2]
Petrochemical & Refined Products Services [Member]
Revenue [Abstract]
Revenues	1,509.5	[1]	1,406.2	[2]
Petrochemical & Refined Products Services [Member] | Sales of Petrochemical and Refined Products [Member]
Revenue [Abstract]
Revenues	1,289.3	[1]	1,211.1	[2]
Petrochemical & Refined Products Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	$ 220.2	[1]	$ 195.1	[2]

[1] Revenues are accounted for under ASC 606 upon implementation at January 1, 2018.

[2] Revenues are accounted for under ASC 605 for historical periods prior to January 1, 2018.