Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Information by business segment [Abstract]
Segment gross operating margin	$ 2,128.4	$ 1,574.7
Mark-to-market gains (losses) in gross operating margin	96.3	(136.8)
Mark-to-market loss in interest expense	0.0	(0.1)
Total mark-to-market gains (losses)	96.3	(136.9)
Revenues from third parties	8,531.2	9,273.8
Revenues from related parties	12.3	24.7
Intersegment and intrasegment revenues	0.0	0.0
Total revenues	8,543.5	9,298.5
Equity in income (loss) of unconsolidated affiliates	154.6	115.7
Property, plant and equipment, net	39,347.5		$ 38,737.6
Investments in unconsolidated affiliates	2,654.3		2,615.1
Intangible assets, net	3,565.9		3,608.4
Goodwill	5,745.2		5,745.2
Segment assets	51,312.9		50,706.3
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	3,314.4	3,413.3
Equity in income (loss) of unconsolidated affiliates	30.1	19.4
Investments in unconsolidated affiliates	670.3		662.0
Intangible assets, net	371.0		380.1
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	2,607.3	3,570.9
Equity in income (loss) of unconsolidated affiliates	124.6	97.9
Investments in unconsolidated affiliates	1,898.0		1,867.5
Intangible assets, net	2,072.6		2,094.6
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	927.5	804.8
Equity in income (loss) of unconsolidated affiliates	1.7	1.0
Investments in unconsolidated affiliates	23.2		22.8
Intangible assets, net	970.1		979.3
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	1,694.3	1,509.5
Equity in income (loss) of unconsolidated affiliates	(1.8)	(2.6)
Investments in unconsolidated affiliates	62.8		62.8
Intangible assets, net	152.2		154.4
Reportable Business Segments [Member] \| NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	959.2	884.9
Mark-to-market gains (losses) in gross operating margin	1.3	(3.4)
Revenues from third parties	3,311.6	3,409.6
Revenues from related parties	2.8	3.7
Intersegment and intrasegment revenues	5,491.4	6,564.9
Total revenues	8,805.8	9,978.2
Equity in income (loss) of unconsolidated affiliates	30.1	19.4
Property, plant and equipment, net	15,909.7		14,845.4
Investments in unconsolidated affiliates	670.3		662.0
Intangible assets, net	371.0		380.1
Goodwill	2,651.7		2,651.7
Segment assets	19,602.7		18,539.2
Reportable Business Segments [Member] \| Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	662.3	220.0
Mark-to-market gains (losses) in gross operating margin	99.8	(129.6)
Revenues from third parties	2,601.6	3,552.7
Revenues from related parties	5.7	18.2
Intersegment and intrasegment revenues	7,885.0	11,426.3
Total revenues	10,492.3	14,997.2
Equity in income (loss) of unconsolidated affiliates	124.6	97.9
Property, plant and equipment, net	6,216.0		5,847.7
Investments in unconsolidated affiliates	1,898.0		1,867.5
Intangible assets, net	2,072.6		2,094.6
Goodwill	1,841.0		1,841.0
Segment assets	12,027.6		11,650.8
Reportable Business Segments [Member] \| Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	264.3	197.9
Mark-to-market gains (losses) in gross operating margin	(0.3)	(2.2)
Revenues from third parties	923.7	802.0
Revenues from related parties	3.8	2.8
Intersegment and intrasegment revenues	195.4	170.9
Total revenues	1,122.9	975.7
Equity in income (loss) of unconsolidated affiliates	1.7	1.0
Property, plant and equipment, net	8,320.5		8,303.8
Investments in unconsolidated affiliates	23.2		22.8
Intangible assets, net	970.1		979.3
Goodwill	296.3		296.3
Segment assets	9,610.1		9,602.2
Reportable Business Segments [Member] \| Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	242.6	271.9
Mark-to-market gains (losses) in gross operating margin	(4.5)	(1.6)
Revenues from third parties	1,694.3	1,509.5
Revenues from related parties	0.0	0.0
Intersegment and intrasegment revenues	714.4	613.3
Total revenues	2,408.7	2,122.8
Equity in income (loss) of unconsolidated affiliates	(1.8)	(2.6)
Property, plant and equipment, net	6,206.0		6,213.9
Investments in unconsolidated affiliates	62.8		62.8
Intangible assets, net	152.2		154.4
Goodwill	956.2		956.2
Segment assets	7,377.2		7,387.3
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	(14,286.2)	(18,775.4)
Total revenues	(14,286.2)	(18,775.4)
Equity in income (loss) of unconsolidated affiliates	0.0	$ 0.0
Adjustments [Member]
Information by business segment [Abstract]
Property, plant and equipment, net	2,695.3		3,526.8
Investments in unconsolidated affiliates	0.0		0.0
Intangible assets, net	0.0		0.0
Goodwill	0.0		0.0
Segment assets	$ 2,695.3		$ 3,526.8

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