Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Identifiable intangible assets [Abstract]
Gross Value	$ 5,267.2		$ 5,267.2
Accumulated Amortization	(1,444.1)		(1,403.1)
Carrying Value	3,823.1		3,864.1
Amortization expense	41.0	$ 46.3
Forecasted amortization expense [Abstract]
Remainder of 2017	121.1
2018	163.8
2019	157.7
2020	152.8
2021	163.2
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	727.3		727.3
Accumulated Amortization	(384.4)		(377.1)
Carrying Value	342.9		350.2
Amortization expense	7.3	7.8
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.4		447.4
Accumulated Amortization	(176.4)		(172.7)
Carrying Value	271.0		274.7
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	279.9		279.9
Accumulated Amortization	(208.0)		(204.4)
Carrying Value	71.9		75.5
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,485.4		2,485.4
Accumulated Amortization	(229.5)		(206.4)
Carrying Value	2,255.9		2,279.0
Amortization expense	23.1	27.7
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,204.4		2,204.4
Accumulated Amortization	(95.2)		(84.5)
Carrying Value	2,109.2		2,119.9
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	281.0		281.0
Accumulated Amortization	(134.3)		(121.9)
Carrying Value	146.7		159.1
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,815.0		1,815.0
Accumulated Amortization	(768.7)		(760.5)
Carrying Value	1,046.3		1,054.5
Amortization expense	8.2	8.6
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3		1,350.3
Accumulated Amortization	(396.0)		(390.0)
Carrying Value	954.3		960.3
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	464.7		464.7
Accumulated Amortization	(372.7)		(370.5)
Carrying Value	92.0		94.2
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	239.5		239.5
Accumulated Amortization	(61.5)		(59.1)
Carrying Value	178.0		180.4
Amortization expense	2.4	$ 2.2
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	185.5		185.5
Accumulated Amortization	(45.5)		(43.9)
Carrying Value	140.0		141.6
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	54.0		54.0
Accumulated Amortization	(16.0)		(15.2)
Carrying Value	$ 38.0		$ 38.8

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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