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Revenues, Revenues by Business Segment and Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue [Abstract]
Revenues	$ 8,543.5	$ 9,298.5
Sales of Products [Member] | Revenues [Member] | Product Concentration Risk [Member]
Revenue [Abstract]
Concentration risk percentage	84.00%	86.00%
Midstream Services [Member] | Revenues [Member] | Product Concentration Risk [Member]
Revenue [Abstract]
Concentration risk percentage	16.00%	14.00%
NGL Pipelines & Services [Member]
Revenue [Abstract]
Revenues	$ 3,314.4	$ 3,413.3
NGL Pipelines & Services [Member] | Sales of NGLs and Related Products [Member]
Revenue [Abstract]
Revenues	2,671.2	2,815.4
NGL Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	643.2	597.9
NGL Pipelines & Services [Member] | Midstream Services: Natural Gas Processing and Fractionation [Member]
Revenue [Abstract]
Revenues	269.5	252.4
NGL Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	275.3	255.5
NGL Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	98.4	90.0
Crude Oil Pipelines & Services [Member]
Revenue [Abstract]
Revenues	2,607.3	3,570.9
Crude Oil Pipelines & Services [Member] | Sales of Crude Oil [Member]
Revenue [Abstract]
Revenues	2,328.4	3,341.7
Crude Oil Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	278.9	229.2
Crude Oil Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	183.7	141.7
Crude Oil Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	95.2	87.5
Natural Gas Pipelines & Services [Member]
Revenue [Abstract]
Revenues	927.5	804.8
Natural Gas Pipelines & Services [Member] | Sales of Natural Gas [Member]
Revenue [Abstract]
Revenues	655.7	560.0
Natural Gas Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	271.8	244.8
Natural Gas Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	271.8	244.8
Petrochemical & Refined Products Services [Member]
Revenue [Abstract]
Revenues	1,694.3	1,509.5
Petrochemical & Refined Products Services [Member] | Sales of Petrochemicals and Refined Products [Member]
Revenue [Abstract]
Revenues	1,480.6	1,289.3
Petrochemical & Refined Products Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	213.7	220.2
Petrochemical & Refined Products Services [Member] | Midstream Services: Fractionation and Isomerization [Member]
Revenue [Abstract]
Revenues	40.8	55.7
Petrochemical & Refined Products Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	126.6	119.6
Petrochemical & Refined Products Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	$ 46.3	$ 44.9

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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