Business Segments and Related Information, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Information by business segment [Abstract]
Segment gross operating margin	$ 2,080.4	$ 2,033.3	$ 6,428.5	$ 6,093.4
Revenues from third parties	10,800.4	6,914.5	29,382.2	20,126.3
Revenues from related parties	30.9	7.5	54.5	29.2
Intersegment and intrasegment revenues	0.0	0.0	0.0	0.0
Total revenues	10,831.3	6,922.0	29,436.7	20,155.5
Equity in income (loss) of unconsolidated affiliates	137.6	82.0	447.2	336.1
Property, plant and equipment, net	42,253.8		42,253.8		$ 41,912.8
Investments in unconsolidated affiliates	2,433.4		2,433.4		2,429.2
Intangible assets, net	3,190.0		3,190.0		3,309.1
Goodwill	5,448.9		5,448.9		5,448.9
Segment assets	53,326.1		53,326.1		53,100.0
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	3,816.6	2,614.0	10,987.2	8,058.4
Equity in income (loss) of unconsolidated affiliates	30.5	29.3	87.5	90.8
Investments in unconsolidated affiliates	656.4		656.4		671.6
Intangible assets, net	323.2		323.2		334.1
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	3,234.6	1,521.6	7,903.6	5,023.7
Equity in income (loss) of unconsolidated affiliates	105.2	51.8	354.2	243.2
Investments in unconsolidated affiliates	1,742.1		1,742.1		1,723.7
Intangible assets, net	1,879.4		1,879.4		1,936.6
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	979.9	606.9	3,275.8	1,862.7
Equity in income (loss) of unconsolidated affiliates	1.4	1.4	4.3	4.3
Investments in unconsolidated affiliates	32.1		32.1		31.4
Intangible assets, net	859.1		859.1		905.0
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	2,800.2	2,179.5	7,270.1	5,210.7
Equity in income (loss) of unconsolidated affiliates	0.5	(0.5)	1.2	(2.2)
Investments in unconsolidated affiliates	2.8		2.8		2.5
Intangible assets, net	128.3		128.3		133.4
Reportable Business Segments [Member] | NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	1,022.9	1,028.1	3,206.9	3,038.2
Revenues from third parties	3,814.5	2,612.4	10,979.6	8,053.4
Revenues from related parties	2.1	1.6	7.6	5.0
Intersegment and intrasegment revenues	13,753.5	7,098.2	37,140.3	18,826.6
Total revenues	17,570.1	9,712.2	48,127.5	26,885.0
Equity in income (loss) of unconsolidated affiliates	30.5	29.3	87.5	90.8
Property, plant and equipment, net	17,330.0		17,330.0		17,128.3
Investments in unconsolidated affiliates	656.4		656.4		671.6
Intangible assets, net	323.2		323.2		334.1
Goodwill	2,651.7		2,651.7		2,651.7
Segment assets	20,961.3		20,961.3		20,785.7
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	422.9	481.8	1,242.0	1,569.1
Revenues from third parties	3,210.0	1,518.0	7,867.3	5,007.0
Revenues from related parties	24.6	3.6	36.3	16.7
Intersegment and intrasegment revenues	6,611.2	6,422.5	21,907.8	18,302.7
Total revenues	9,845.8	7,944.1	29,811.4	23,326.4
Equity in income (loss) of unconsolidated affiliates	105.2	51.8	354.2	243.2
Property, plant and equipment, net	6,927.3		6,927.3		6,982.6
Investments in unconsolidated affiliates	1,742.1		1,742.1		1,723.7
Intangible assets, net	1,879.4		1,879.4		1,936.6
Goodwill	1,841.0		1,841.0		1,841.0
Segment assets	12,389.8		12,389.8		12,483.9
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	223.3	208.4	960.5	701.1
Revenues from third parties	975.7	604.6	3,265.2	1,855.2
Revenues from related parties	4.2	2.3	10.6	7.5
Intersegment and intrasegment revenues	145.9	117.0	441.0	325.0
Total revenues	1,125.8	723.9	3,716.8	2,187.7
Equity in income (loss) of unconsolidated affiliates	1.4	1.4	4.3	4.3
Property, plant and equipment, net	8,280.3		8,280.3		8,465.8
Investments in unconsolidated affiliates	32.1		32.1		31.4
Intangible assets, net	859.1		859.1		905.0
Goodwill	0.0		0.0		0.0
Segment assets	9,171.5		9,171.5		9,402.2
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	411.3	315.0	1,019.1	785.0
Revenues from third parties	2,800.2	2,179.5	7,270.1	5,210.7
Revenues from related parties	0.0	0.0	0.0	0.0
Intersegment and intrasegment revenues	6,149.9	1,297.8	18,979.7	2,815.6
Total revenues	8,950.1	3,477.3	26,249.8	8,026.3
Equity in income (loss) of unconsolidated affiliates	0.5	(0.5)	1.2	(2.2)
Property, plant and equipment, net	7,533.6		7,533.6		7,528.4
Investments in unconsolidated affiliates	2.8		2.8		2.5
Intangible assets, net	128.3		128.3		133.4
Goodwill	956.2		956.2		956.2
Segment assets	8,620.9		8,620.9		8,620.5
Eliminations [Member]
Information by business segment [Abstract]
Revenues from third parties	0.0	0.0	0.0	0.0
Revenues from related parties	0.0	0.0	0.0	0.0
Intersegment and intrasegment revenues	(26,660.5)	(14,935.5)	(78,468.8)	(40,269.9)
Total revenues	(26,660.5)	(14,935.5)	(78,468.8)	(40,269.9)
Equity in income (loss) of unconsolidated affiliates	0.0	$ 0.0	0.0	$ 0.0
Adjustments [Member]
Information by business segment [Abstract]
Property, plant and equipment, net	2,182.6		2,182.6		1,807.7
Investments in unconsolidated affiliates	0.0		0.0		0.0
Intangible assets, net	0.0		0.0		0.0
Goodwill	0.0		0.0		0.0
Segment assets	$ 2,182.6		$ 2,182.6		$ 1,807.7