Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Information by business segment [Abstract]
Segment gross operating margin	$ 2,303.3	$ 2,057.2
Revenues from third parties	9,141.1	7,466.5
Revenues from related parties	14.2	16.0
Intersegment and intrasegment revenues	0.0	0.0
Total revenues	9,155.3	7,482.5
Equity in income (loss) of unconsolidated affiliates	148.9	140.8
Property, plant and equipment, net	42,102.4		$ 41,912.8
Investments in unconsolidated affiliates	2,449.8		2,429.2
Intangible assets, net	3,259.8		3,309.1
Goodwill	5,448.9		5,448.9
Segment assets	53,260.9		53,100.0
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	3,583.5	2,968.1
Equity in income (loss) of unconsolidated affiliates	28.1	32.7
Investments in unconsolidated affiliates	664.6		671.6
Intangible assets, net	328.1		334.1
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	2,165.5	2,038.9
Equity in income (loss) of unconsolidated affiliates	118.9	107.3
Investments in unconsolidated affiliates	1,749.5		1,723.7
Intangible assets, net	1,918.8		1,936.6
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	1,586.8	670.6
Equity in income (loss) of unconsolidated affiliates	1.4	1.6
Investments in unconsolidated affiliates	32.5		31.4
Intangible assets, net	881.2		905.0
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	1,819.5	1,804.9
Equity in income (loss) of unconsolidated affiliates	0.5	(0.8)
Investments in unconsolidated affiliates	3.2		2.5
Intangible assets, net	131.7		133.4
Reportable Business Segments [Member] | NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	1,086.4	1,042.0
Revenues from third parties	3,580.7	2,966.3
Revenues from related parties	2.8	1.8
Intersegment and intrasegment revenues	13,088.6	5,780.7
Total revenues	16,672.1	8,748.8
Equity in income (loss) of unconsolidated affiliates	28.1	32.7
Property, plant and equipment, net	17,121.5		17,128.3
Investments in unconsolidated affiliates	664.6		671.6
Intangible assets, net	328.1		334.1
Goodwill	2,651.7		2,651.7
Segment assets	20,765.9		20,785.7
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	400.2	452.9
Revenues from third parties	2,157.0	2,027.7
Revenues from related parties	8.5	11.2
Intersegment and intrasegment revenues	7,420.1	7,840.3
Total revenues	9,585.6	9,879.2
Equity in income (loss) of unconsolidated affiliates	118.9	107.3
Property, plant and equipment, net	7,015.1		6,982.6
Investments in unconsolidated affiliates	1,749.5		1,723.7
Intangible assets, net	1,918.8		1,936.6
Goodwill	1,841.0		1,841.0
Segment assets	12,524.4		12,483.9
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	535.2	283.8
Revenues from third parties	1,583.9	667.6
Revenues from related parties	2.9	3.0
Intersegment and intrasegment revenues	145.8	115.1
Total revenues	1,732.6	785.7
Equity in income (loss) of unconsolidated affiliates	1.4	1.6
Property, plant and equipment, net	8,355.8		8,465.8
Investments in unconsolidated affiliates	32.5		31.4
Intangible assets, net	881.2		905.0
Goodwill	0.0		0.0
Segment assets	9,269.5		9,402.2
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	281.5	278.5
Revenues from third parties	1,819.5	1,804.9
Revenues from related parties	0.0	0.0
Intersegment and intrasegment revenues	6,234.2	808.1
Total revenues	8,053.7	2,613.0
Equity in income (loss) of unconsolidated affiliates	0.5	(0.8)
Property, plant and equipment, net	7,554.7		7,528.4
Investments in unconsolidated affiliates	3.2		2.5
Intangible assets, net	131.7		133.4
Goodwill	956.2		956.2
Segment assets	8,645.8		8,620.5
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	(26,888.7)	(14,544.2)
Total revenues	(26,888.7)	(14,544.2)
Equity in income (loss) of unconsolidated affiliates	0.0	$ 0.0
Adjustments [Member]
Information by business segment [Abstract]
Property, plant and equipment, net	2,055.3		1,807.7
Investments in unconsolidated affiliates	0.0		0.0
Intangible assets, net	0.0		0.0
Goodwill	0.0		0.0
Segment assets	$ 2,055.3		$ 1,807.7