Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Information by business segment [Abstract]
Segment gross operating margin	$ 2,057.2	$ 2,128.4
Mark-to-market gains (losses) in gross operating margin	29.5	96.3
Revenues from third parties	7,466.5	8,531.2
Revenues from related parties	16.0	12.3
Intersegment and intrasegment revenues	0.0	0.0
Total revenues	7,482.5	8,543.5
Equity in income (loss) of unconsolidated affiliates	140.8	154.6
Property, plant and equipment, net	42,159.1		$ 41,603.4
Investments in unconsolidated affiliates	2,608.5		2,600.2
Intangible assets, net	3,409.4		3,449.0
Goodwill	5,745.2		5,745.2
Segment assets	53,922.2		53,397.8
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	2,968.1	3,314.4
Equity in income (loss) of unconsolidated affiliates	32.7	30.1
Investments in unconsolidated affiliates	699.1		703.8
Intangible assets, net	353.7		360.2
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	2,038.9	2,607.3
Equity in income (loss) of unconsolidated affiliates	107.3	124.6
Investments in unconsolidated affiliates	1,877.5		1,866.5
Intangible assets, net	1,981.0		2,001.9
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	670.6	927.5
Equity in income (loss) of unconsolidated affiliates	1.6	1.7
Investments in unconsolidated affiliates	27.9		27.3
Intangible assets, net	931.0		941.2
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	1,804.9	1,694.3
Equity in income (loss) of unconsolidated affiliates	(0.8)	(1.8)
Investments in unconsolidated affiliates	4.0		2.6
Intangible assets, net	143.7		145.7
Reportable Business Segments [Member] \| NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	1,042.0	959.2
Mark-to-market gains (losses) in gross operating margin	(12.3)	1.3
Revenues from third parties	2,966.3	3,311.6
Revenues from related parties	1.8	2.8
Intersegment and intrasegment revenues	5,780.7	5,491.4
Total revenues	8,748.8	8,805.8
Equity in income (loss) of unconsolidated affiliates	32.7	30.1
Property, plant and equipment, net	16,997.8		16,652.1
Investments in unconsolidated affiliates	699.1		703.8
Intangible assets, net	353.7		360.2
Goodwill	2,651.7		2,651.7
Segment assets	20,702.3		20,367.8
Reportable Business Segments [Member] \| Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	452.9	662.3
Mark-to-market gains (losses) in gross operating margin	10.7	99.8
Revenues from third parties	2,027.7	2,601.6
Revenues from related parties	11.2	5.7
Intersegment and intrasegment revenues	7,840.3	7,885.0
Total revenues	9,879.2	10,492.3
Equity in income (loss) of unconsolidated affiliates	107.3	124.6
Property, plant and equipment, net	6,340.2		6,324.4
Investments in unconsolidated affiliates	1,877.5		1,866.5
Intangible assets, net	1,981.0		2,001.9
Goodwill	1,841.0		1,841.0
Segment assets	12,039.7		12,033.8
Reportable Business Segments [Member] \| Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	283.8	264.3
Mark-to-market gains (losses) in gross operating margin	28.8	(0.3)
Revenues from third parties	667.6	923.7
Revenues from related parties	3.0	3.8
Intersegment and intrasegment revenues	115.1	195.4
Total revenues	785.7	1,122.9
Equity in income (loss) of unconsolidated affiliates	1.6	1.7
Property, plant and equipment, net	8,433.6		8,432.5
Investments in unconsolidated affiliates	27.9		27.3
Intangible assets, net	931.0		941.2
Goodwill	296.3		296.3
Segment assets	9,688.8		9,697.3
Reportable Business Segments [Member] \| Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	278.5	242.6
Mark-to-market gains (losses) in gross operating margin	2.3	(4.5)
Revenues from third parties	1,804.9	1,694.3
Revenues from related parties	0.0	0.0
Intersegment and intrasegment revenues	808.1	714.4
Total revenues	2,613.0	2,408.7
Equity in income (loss) of unconsolidated affiliates	(0.8)	(1.8)
Property, plant and equipment, net	7,570.1		7,553.2
Investments in unconsolidated affiliates	4.0		2.6
Intangible assets, net	143.7		145.7
Goodwill	956.2		956.2
Segment assets	8,674.0		8,657.7
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	(14,544.2)	(14,286.2)
Total revenues	(14,544.2)	(14,286.2)
Equity in income (loss) of unconsolidated affiliates	0.0	$ 0.0
Adjustments [Member]
Information by business segment [Abstract]
Property, plant and equipment, net	2,817.4		2,641.2
Investments in unconsolidated affiliates	0.0		0.0
Intangible assets, net	0.0		0.0
Goodwill	0.0		0.0
Segment assets	$ 2,817.4		$ 2,641.2

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