Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Information by business segment [Abstract]
Segment gross operating margin	$ 1,304.4	$ 1,307.6	$ 4,157.1	$ 3,875.5
Revenues from third parties	6,874.4	5,904.7	20,781.7	16,499.0
Revenues from related parties	12.5	15.7	33.2	44.5
Intersegment and intrasegment revenues	0.0	0.0	0.0	0.0
Total revenues	6,886.9	5,920.4	20,814.9	16,543.5
Equity in income (loss) of unconsolidated affiliates	113.4	92.3	315.2	269.8
Property, plant and equipment, net	34,979.3		34,979.3		$ 33,292.5
Investments in unconsolidated affiliates	2,660.2		2,660.2		2,677.3
Intangible assets, net	3,739.8		3,739.8		3,864.1
Goodwill	5,745.2		5,745.2		5,745.2
Segment assets	47,124.5		47,124.5		45,579.1
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	2,914.3	2,416.9	8,880.7	7,336.2
Equity in income (loss) of unconsolidated affiliates	18.8	15.9	53.3	45.0
Intangible assets, net	327.7		327.7		350.2
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	1,796.7	1,723.0	5,503.5	4,671.6
Equity in income (loss) of unconsolidated affiliates	95.9	78.4	266.3	234.3
Intangible assets, net	2,211.0		2,211.0		2,279.0
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	796.6	714.2	2,344.0	1,799.9
Equity in income (loss) of unconsolidated affiliates	0.9	1.0	2.8	2.9
Intangible assets, net	1,028.2		1,028.2		1,054.5
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	1,379.3	1,066.3	4,086.7	2,735.8
Equity in income (loss) of unconsolidated affiliates	(2.2)	(3.0)	(7.2)	(12.4)
Intangible assets, net	172.9		172.9		180.4
Reportable Business Segments [Member] \| NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	770.9	703.5	2,386.8	2,206.3
Revenues from third parties	2,911.1	2,414.2	8,871.9	7,328.9
Revenues from related parties	3.2	2.7	8.8	7.3
Intersegment and intrasegment revenues	5,055.1	4,772.4	19,572.0	12,828.0
Total revenues	7,969.4	7,189.3	28,452.7	20,164.2
Equity in income (loss) of unconsolidated affiliates	18.8	15.9	53.3	45.0
Property, plant and equipment, net	13,892.1		13,892.1		14,091.5
Investments in unconsolidated affiliates	742.8		742.8		750.4
Intangible assets, net	327.7		327.7		350.2
Goodwill	2,651.7		2,651.7		2,651.7
Segment assets	17,614.3		17,614.3		17,843.8
Reportable Business Segments [Member] \| Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	190.4	254.0	691.7	633.7
Revenues from third parties	1,790.7	1,712.9	5,489.1	4,641.8
Revenues from related parties	6.0	10.1	14.4	29.8
Intersegment and intrasegment revenues	2,552.9	2,445.2	9,410.6	6,390.3
Total revenues	4,349.6	4,168.2	14,914.1	11,061.9
Equity in income (loss) of unconsolidated affiliates	95.9	78.4	266.3	234.3
Property, plant and equipment, net	4,333.4		4,333.4		4,216.1
Investments in unconsolidated affiliates	1,829.8		1,829.8		1,824.6
Intangible assets, net	2,211.0		2,211.0		2,279.0
Goodwill	1,841.0		1,841.0		1,841.0
Segment assets	10,215.2		10,215.2		10,160.7
Reportable Business Segments [Member] \| Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	170.7	178.5	536.0	533.6
Revenues from third parties	793.3	711.3	2,334.0	1,792.5
Revenues from related parties	3.3	2.9	10.0	7.4
Intersegment and intrasegment revenues	220.1	201.2	635.2	472.8
Total revenues	1,016.7	915.4	2,979.2	2,272.7
Equity in income (loss) of unconsolidated affiliates	0.9	1.0	2.8	2.9
Property, plant and equipment, net	8,415.7		8,415.7		8,403.0
Investments in unconsolidated affiliates	21.2		21.2		21.7
Intangible assets, net	1,028.2		1,028.2		1,054.5
Goodwill	296.3		296.3		296.3
Segment assets	9,761.4		9,761.4		9,775.5
Reportable Business Segments [Member] \| Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	172.4	171.6	542.6	501.9
Revenues from third parties	1,379.3	1,066.3	4,086.7	2,735.8
Revenues from related parties	0.0	0.0	0.0	0.0
Intersegment and intrasegment revenues	426.4	315.4	1,230.8	865.8
Total revenues	1,805.7	1,381.7	5,317.5	3,601.6
Equity in income (loss) of unconsolidated affiliates	(2.2)	(3.0)	(7.2)	(12.4)
Property, plant and equipment, net	3,396.1		3,396.1		3,261.2
Investments in unconsolidated affiliates	66.4		66.4		80.6
Intangible assets, net	172.9		172.9		180.4
Goodwill	956.2		956.2		956.2
Segment assets	4,591.6		4,591.6		4,478.4
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	(8,254.5)	(7,734.2)	(30,848.6)	(20,556.9)
Total revenues	(8,254.5)	(7,734.2)	(30,848.6)	(20,556.9)
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	4,942.0		4,942.0		3,320.7
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	$ 4,942.0		$ 4,942.0		$ 3,320.7

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

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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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