Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Information by business segment [Abstract]
Segment gross operating margin	$ 1,574.7	$ 1,473.3
Revenues from third parties	9,273.8	7,309.6
Revenues from related parties	24.7	10.8
Intersegment and intrasegment revenues	0.0	0.0
Total revenues	9,298.5	7,320.4
Equity in income (loss) of unconsolidated affiliates	115.7	94.8
Property, plant and equipment, net	36,416.3		$ 35,620.4
Investments in unconsolidated affiliates	2,583.4		2,659.4
Intangible assets, net	3,736.4		3,690.3
Goodwill	5,745.2		5,745.2
Segment assets	48,481.3		47,715.3
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	3,413.3	3,345.8
Equity in income (loss) of unconsolidated affiliates	19.4	15.5
Intangible assets, net	404.4		322.3
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	3,570.9	1,807.2
Equity in income (loss) of unconsolidated affiliates	97.9	81.2
Intangible assets, net	2,162.5		2,186.5
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	804.8	761.2
Equity in income (loss) of unconsolidated affiliates	1.0	1.0
Intangible assets, net	1,008.7		1,018.4
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	1,509.5	1,406.2
Equity in income (loss) of unconsolidated affiliates	(2.6)	(2.9)
Intangible assets, net	160.8		163.1
Reportable Business Segments [Member] \| NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	884.9	856.0
Revenues from third parties	3,409.6	3,343.0
Revenues from related parties	3.7	2.8
Intersegment and intrasegment revenues	6,564.9	8,874.8
Total revenues	9,978.2	12,220.6
Equity in income (loss) of unconsolidated affiliates	19.4	15.5
Property, plant and equipment, net	14,141.6		13,831.2
Investments in unconsolidated affiliates	618.1		733.9
Intangible assets, net	404.4		322.3
Goodwill	2,651.7		2,651.7
Segment assets	17,815.8		17,539.1
Reportable Business Segments [Member] \| Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	220.0	264.6
Revenues from third parties	3,552.7	1,802.6
Revenues from related parties	18.2	4.6
Intersegment and intrasegment revenues	11,426.3	3,474.0
Total revenues	14,997.2	5,281.2
Equity in income (loss) of unconsolidated affiliates	97.9	81.2
Property, plant and equipment, net	5,255.5		5,208.4
Investments in unconsolidated affiliates	1,872.5		1,839.2
Intangible assets, net	2,162.5		2,186.5
Goodwill	1,841.0		1,841.0
Segment assets	11,131.5		11,075.1
Reportable Business Segments [Member] \| Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	197.9	170.9
Revenues from third parties	802.0	757.8
Revenues from related parties	2.8	3.4
Intersegment and intrasegment revenues	170.9	194.5
Total revenues	975.7	955.7
Equity in income (loss) of unconsolidated affiliates	1.0	1.0
Property, plant and equipment, net	8,297.8		8,375.0
Investments in unconsolidated affiliates	20.6		20.8
Intangible assets, net	1,008.7		1,018.4
Goodwill	296.3		296.3
Segment assets	9,623.4		9,710.5
Reportable Business Segments [Member] \| Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	271.9	181.8
Revenues from third parties	1,509.5	1,406.2
Revenues from related parties	0.0	0.0
Intersegment and intrasegment revenues	613.3	414.7
Total revenues	2,122.8	1,820.9
Equity in income (loss) of unconsolidated affiliates	(2.6)	(2.9)
Property, plant and equipment, net	3,518.3		3,507.7
Investments in unconsolidated affiliates	72.2		65.5
Intangible assets, net	160.8		163.1
Goodwill	956.2		956.2
Segment assets	4,707.5		4,692.5
Eliminations [Member]
Information by business segment [Abstract]
Revenues from third parties	0.0	0.0
Revenues from related parties	0.0	0.0
Intersegment and intrasegment revenues	(18,775.4)	(12,958.0)
Total revenues	(18,775.4)	(12,958.0)
Equity in income (loss) of unconsolidated affiliates	0.0	$ 0.0
Adjustments [Member]
Information by business segment [Abstract]
Property, plant and equipment, net	5,203.1		4,698.1
Investments in unconsolidated affiliates	0.0		0.0
Intangible assets, net	0.0		0.0
Goodwill	0.0		0.0
Segment assets	$ 5,203.1		$ 4,698.1

Amount of revenue from transactions with other operating segments of the same entity.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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