Business Segments and Related Information, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Information by business segment [Abstract]
Segment gross operating margin	$ 2,044.8	$ 2,002.9	$ 4,348.1	$ 4,060.1
Revenues from third parties	9,440.7	5,745.3	18,581.8	13,211.8
Revenues from related parties	9.4	5.7	23.6	21.7
Intersegment and intrasegment revenues	0.0	0.0	0.0	0.0
Total revenues	9,450.1	5,751.0	18,605.4	13,233.5
Equity in income (loss) of unconsolidated affiliates	160.7	113.3	309.6	254.1
Property, plant and equipment, net	42,233.1		42,233.1		$ 41,912.8
Investments in unconsolidated affiliates	2,442.7		2,442.7		2,429.2
Intangible assets, net	3,229.7		3,229.7		3,309.1
Goodwill	5,448.9		5,448.9		5,448.9
Segment assets	53,354.4		53,354.4		53,100.0
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	3,587.1	2,476.3	7,170.6	5,444.4
Equity in income (loss) of unconsolidated affiliates	28.9	28.8	57.0	61.5
Investments in unconsolidated affiliates	658.4		658.4		671.6
Intangible assets, net	329.4		329.4		334.1
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	2,503.5	1,463.2	4,669.0	3,502.1
Equity in income (loss) of unconsolidated affiliates	130.1	84.1	249.0	191.4
Investments in unconsolidated affiliates	1,749.4		1,749.4		1,723.7
Intangible assets, net	1,899.7		1,899.7		1,936.6
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	709.1	585.2	2,295.9	1,255.8
Equity in income (loss) of unconsolidated affiliates	1.5	1.3	2.9	2.9
Investments in unconsolidated affiliates	32.2		32.2		31.4
Intangible assets, net	870.6		870.6		905.0
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	2,650.4	1,226.3	4,469.9	3,031.2
Equity in income (loss) of unconsolidated affiliates	0.2	(0.9)	0.7	(1.7)
Investments in unconsolidated affiliates	2.7		2.7		2.5
Intangible assets, net	130.0		130.0		133.4
Reportable Business Segments [Member] | NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	1,097.6	968.1	2,184.0	2,010.1
Revenues from third parties	3,584.4	2,474.7	7,165.1	5,441.0
Revenues from related parties	2.7	1.6	5.5	3.4
Intersegment and intrasegment revenues	10,298.2	5,947.7	23,386.8	11,728.4
Total revenues	13,885.3	8,424.0	30,557.4	17,172.8
Equity in income (loss) of unconsolidated affiliates	28.9	28.8	57.0	61.5
Property, plant and equipment, net	17,229.5		17,229.5		17,128.3
Investments in unconsolidated affiliates	658.4		658.4		671.6
Intangible assets, net	329.4		329.4		334.1
Goodwill	2,651.7		2,651.7		2,651.7
Segment assets	20,869.0		20,869.0		20,785.7
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	418.9	634.4	819.1	1,087.3
Revenues from third parties	2,500.3	1,461.3	4,657.3	3,489.0
Revenues from related parties	3.2	1.9	11.7	13.1
Intersegment and intrasegment revenues	7,876.5	4,039.9	15,296.6	11,880.2
Total revenues	10,380.0	5,503.1	19,965.6	15,382.3
Equity in income (loss) of unconsolidated affiliates	130.1	84.1	249.0	191.4
Property, plant and equipment, net	6,989.7		6,989.7		6,982.6
Investments in unconsolidated affiliates	1,749.4		1,749.4		1,723.7
Intangible assets, net	1,899.7		1,899.7		1,936.6
Goodwill	1,841.0		1,841.0		1,841.0
Segment assets	12,479.8		12,479.8		12,483.9
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	202.0	208.9	737.2	492.7
Revenues from third parties	705.6	583.0	2,289.5	1,250.6
Revenues from related parties	3.5	2.2	6.4	5.2
Intersegment and intrasegment revenues	149.3	92.9	295.1	208.0
Total revenues	858.4	678.1	2,591.0	1,463.8
Equity in income (loss) of unconsolidated affiliates	1.5	1.3	2.9	2.9
Property, plant and equipment, net	8,311.2		8,311.2		8,465.8
Investments in unconsolidated affiliates	32.2		32.2		31.4
Intangible assets, net	870.6		870.6		905.0
Goodwill	0.0		0.0		0.0
Segment assets	9,214.0		9,214.0		9,402.2
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	326.3	191.5	607.8	470.0
Revenues from third parties	2,650.4	1,226.3	4,469.9	3,031.2
Revenues from related parties	0.0	0.0	0.0	0.0
Intersegment and intrasegment revenues	6,595.6	709.7	12,829.8	1,517.8
Total revenues	9,246.0	1,936.0	17,299.7	4,549.0
Equity in income (loss) of unconsolidated affiliates	0.2	(0.9)	0.7	(1.7)
Property, plant and equipment, net	7,553.6		7,553.6		7,528.4
Investments in unconsolidated affiliates	2.7		2.7		2.5
Intangible assets, net	130.0		130.0		133.4
Goodwill	956.2		956.2		956.2
Segment assets	8,642.5		8,642.5		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	(24,919.6)	(10,790.2)	(51,808.3)	(25,334.4)
Total revenues	(24,919.6)	(10,790.2)	(51,808.3)	(25,334.4)
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	2,149.1		2,149.1		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	$ 2,149.1		$ 2,149.1		$ 1,807.7