Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Information by business segment [Abstract]
Segment gross operating margin	$ 1,461.7	$ 1,379.4	$ 3,036.4	$ 2,852.7
Revenues from third parties	8,411.9	6,597.7	17,685.7	13,907.3
Revenues from related parties	55.6	9.9	80.3	20.7
Intersegment and intrasegment revenues	0.0	0.0	0.0	0.0
Total revenues	8,467.5	6,607.6	17,766.0	13,928.0
Equity in income (loss) of unconsolidated affiliates	122.3	107.0	238.0	201.8
Property, plant and equipment, net	37,054.5		37,054.5		$ 35,620.4
Investments in unconsolidated affiliates	2,581.5		2,581.5		2,659.4
Intangible assets, net	3,696.1		3,696.1		3,690.3
Goodwill	5,745.2		5,745.2		5,745.2
Segment assets	49,077.3		49,077.3		47,715.3
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	3,273.7	2,620.6	6,687.0	5,966.4
Equity in income (loss) of unconsolidated affiliates	39.4	19.0	58.8	34.5
Intangible assets, net	398.4		398.4		322.3
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	2,781.2	1,899.6	6,352.1	3,706.8
Equity in income (loss) of unconsolidated affiliates	83.5	89.2	181.4	170.4
Intangible assets, net	2,139.9		2,139.9		2,186.5
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	792.8	786.2	1,597.6	1,547.4
Equity in income (loss) of unconsolidated affiliates	1.6	0.9	2.6	1.9
Intangible assets, net	999.1		999.1		1,018.4
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	1,619.8	1,301.2	3,129.3	2,707.4
Equity in income (loss) of unconsolidated affiliates	(2.2)	(2.1)	(4.8)	(5.0)
Intangible assets, net	158.7		158.7		163.1
Reportable Business Segments [Member] \| NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	913.7	759.9	1,798.6	1,615.9
Revenues from third parties	3,268.8	2,617.8	6,678.4	5,960.8
Revenues from related parties	4.9	2.8	8.6	5.6
Intersegment and intrasegment revenues	6,004.6	5,642.1	12,569.5	14,516.9
Total revenues	9,278.3	8,262.7	19,256.5	20,483.3
Equity in income (loss) of unconsolidated affiliates	39.4	19.0	58.8	34.5
Property, plant and equipment, net	14,716.9		14,716.9		13,831.2
Investments in unconsolidated affiliates	630.5		630.5		733.9
Intangible assets, net	398.4		398.4		322.3
Goodwill	2,651.7		2,651.7		2,651.7
Segment assets	18,397.5		18,397.5		17,539.1
Reportable Business Segments [Member] \| Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	52.8	236.7	272.8	501.3
Revenues from third parties	2,733.8	1,895.8	6,286.5	3,698.4
Revenues from related parties	47.4	3.8	65.6	8.4
Intersegment and intrasegment revenues	9,978.5	3,383.7	21,404.8	6,857.7
Total revenues	12,759.7	5,283.3	27,756.9	10,564.5
Equity in income (loss) of unconsolidated affiliates	83.5	89.2	181.4	170.4
Property, plant and equipment, net	5,401.3		5,401.3		5,208.4
Investments in unconsolidated affiliates	1,865.7		1,865.7		1,839.2
Intangible assets, net	2,139.9		2,139.9		2,186.5
Goodwill	1,841.0		1,841.0		1,841.0
Segment assets	11,247.9		11,247.9		11,075.1
Reportable Business Segments [Member] \| Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	213.4	194.4	411.3	365.3
Revenues from third parties	789.5	782.9	1,591.5	1,540.7
Revenues from related parties	3.3	3.3	6.1	6.7
Intersegment and intrasegment revenues	165.0	220.6	335.9	415.1
Total revenues	957.8	1,006.8	1,933.5	1,962.5
Equity in income (loss) of unconsolidated affiliates	1.6	0.9	2.6	1.9
Property, plant and equipment, net	8,356.1		8,356.1		8,375.0
Investments in unconsolidated affiliates	21.0		21.0		20.8
Intangible assets, net	999.1		999.1		1,018.4
Goodwill	296.3		296.3		296.3
Segment assets	9,672.5		9,672.5		9,710.5
Reportable Business Segments [Member] \| Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	281.8	188.4	553.7	370.2
Revenues from third parties	1,619.8	1,301.2	3,129.3	2,707.4
Revenues from related parties	0.0	0.0	0.0	0.0
Intersegment and intrasegment revenues	784.0	389.7	1,397.3	804.4
Total revenues	2,403.8	1,690.9	4,526.6	3,511.8
Equity in income (loss) of unconsolidated affiliates	(2.2)	(2.1)	(4.8)	(5.0)
Property, plant and equipment, net	6,235.0		6,235.0		3,507.7
Investments in unconsolidated affiliates	64.3		64.3		65.5
Intangible assets, net	158.7		158.7		163.1
Goodwill	956.2		956.2		956.2
Segment assets	7,414.2		7,414.2		4,692.5
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	(16,932.1)	(9,636.1)	(35,707.5)	(22,594.1)
Total revenues	(16,932.1)	(9,636.1)	(35,707.5)	(22,594.1)
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	2,345.2		2,345.2		4,698.1
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	$ 2,345.2		$ 2,345.2		$ 4,698.1

Amount of revenue from transactions with other operating segments of the same entity.

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Amount of total assets attributed to the reportable segment.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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