Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Information by business segment [Abstract]
Segment gross operating margin	$ 2,051.4	$ 2,123.6	$ 6,266.0	$ 5,160.0
Mark-to-market gains (losses) in gross operating margin	9.1	204.1	92.9	(254.8)
Mark-to-market loss in interest expense	(94.9)	0.0	(94.9)	(0.1)
Total mark-to-market gains (losses)	(85.8)	204.1	(2.0)	(254.9)
Revenues from third parties	7,948.5	9,571.7	24,730.2	27,257.4
Revenues from related parties	15.6	14.2	53.7	94.5
Intersegment and intrasegment revenues	0.0	0.0	0.0	0.0
Total revenues	7,964.1	9,585.9	24,783.9	27,351.9
Equity in income (loss) of unconsolidated affiliates	139.3	112.0	431.3	350.0
Property, plant and equipment, net	40,763.3		40,763.3		$ 38,737.6
Investments in unconsolidated affiliates	2,660.9		2,660.9		2,615.1
Intangible assets, net	3,489.4		3,489.4		3,608.4
Goodwill	5,745.2		5,745.2		5,745.2
Segment assets	52,658.8		52,658.8		50,706.3
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	3,252.1	4,622.9	9,851.2	11,309.9
Equity in income (loss) of unconsolidated affiliates	25.9	28.3	82.7	87.1
Investments in unconsolidated affiliates	690.9		690.9		662.0
Intangible assets, net	366.7		366.7		380.1
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	2,478.3	2,494.9	7,952.2	8,847.0
Equity in income (loss) of unconsolidated affiliates	113.2	83.7	348.8	265.1
Investments in unconsolidated affiliates	1,877.2		1,877.2		1,867.5
Intangible assets, net	2,023.4		2,023.4		2,094.6
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	715.5	850.2	2,462.3	2,447.8
Equity in income (loss) of unconsolidated affiliates	1.6	2.1	4.9	4.7
Investments in unconsolidated affiliates	31.4		31.4		22.8
Intangible assets, net	951.4		951.4		979.3
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	1,518.2	1,617.9	4,518.2	4,747.2
Equity in income (loss) of unconsolidated affiliates	(1.4)	(2.1)	(5.1)	(6.9)
Investments in unconsolidated affiliates	61.4		61.4		62.8
Intangible assets, net	147.9		147.9		154.4
Reportable Business Segments [Member] \| NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	1,008.3	1,063.1	2,933.8	2,861.7
Mark-to-market gains (losses) in gross operating margin	(0.7)	0.1	(0.1)	7.9
Revenues from third parties	3,250.1	4,616.7	9,843.9	11,295.1
Revenues from related parties	2.0	6.2	7.3	14.8
Intersegment and intrasegment revenues	4,729.3	6,814.9	14,715.5	19,384.4
Total revenues	7,981.4	11,437.8	24,566.7	30,694.3
Equity in income (loss) of unconsolidated affiliates	25.9	28.3	82.7	87.1
Property, plant and equipment, net	16,212.2		16,212.2		14,845.4
Investments in unconsolidated affiliates	690.9		690.9		662.0
Intangible assets, net	366.7		366.7		380.1
Goodwill	2,651.7		2,651.7		2,651.7
Segment assets	19,921.5		19,921.5		18,539.2
Reportable Business Segments [Member] \| Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	496.2	594.2	1,671.7	867.0
Mark-to-market gains (losses) in gross operating margin	9.8	200.2	95.0	(267.4)
Revenues from third parties	2,467.9	2,490.7	7,916.5	8,777.2
Revenues from related parties	10.4	4.2	35.7	69.8
Intersegment and intrasegment revenues	9,479.7	6,278.8	26,818.0	27,683.6
Total revenues	11,958.0	8,773.7	34,770.2	36,530.6
Equity in income (loss) of unconsolidated affiliates	113.2	83.7	348.8	265.1
Property, plant and equipment, net	6,316.2		6,316.2		5,847.7
Investments in unconsolidated affiliates	1,877.2		1,877.2		1,867.5
Intangible assets, net	2,023.4		2,023.4		2,094.6
Goodwill	1,841.0		1,841.0		1,841.0
Segment assets	12,057.8		12,057.8		11,650.8
Reportable Business Segments [Member] \| Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	258.5	216.9	824.6	628.2
Mark-to-market gains (losses) in gross operating margin	1.3	4.7	1.3	5.9
Revenues from third parties	712.3	846.4	2,451.6	2,437.9
Revenues from related parties	3.2	3.8	10.7	9.9
Intersegment and intrasegment revenues	141.7	186.6	500.2	522.5
Total revenues	857.2	1,036.8	2,962.5	2,970.3
Equity in income (loss) of unconsolidated affiliates	1.6	2.1	4.9	4.7
Property, plant and equipment, net	8,320.5		8,320.5		8,303.8
Investments in unconsolidated affiliates	31.4		31.4		22.8
Intangible assets, net	951.4		951.4		979.3
Goodwill	296.3		296.3		296.3
Segment assets	9,599.6		9,599.6		9,602.2
Reportable Business Segments [Member] \| Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	288.4	249.4	835.9	803.1
Mark-to-market gains (losses) in gross operating margin	(1.3)	(0.9)	(3.3)	(1.2)
Revenues from third parties	1,518.2	1,617.9	4,518.2	4,747.2
Revenues from related parties	0.0	0.0	0.0	0.0
Intersegment and intrasegment revenues	558.1	844.3	1,890.4	2,241.6
Total revenues	2,076.3	2,462.2	6,408.6	6,988.8
Equity in income (loss) of unconsolidated affiliates	(1.4)	(2.1)	(5.1)	(6.9)
Property, plant and equipment, net	6,356.3		6,356.3		6,213.9
Investments in unconsolidated affiliates	61.4		61.4		62.8
Intangible assets, net	147.9		147.9		154.4
Goodwill	956.2		956.2		956.2
Segment assets	7,521.8		7,521.8		7,387.3
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	(14,908.8)	(14,124.6)	(43,924.1)	(49,832.1)
Total revenues	(14,908.8)	(14,124.6)	(43,924.1)	(49,832.1)
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	3,558.1		3,558.1		3,526.8
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	$ 3,558.1		$ 3,558.1		$ 3,526.8

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