Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Identifiable intangible assets [Abstract]
Gross Value	$ 5,273.0		$ 5,273.0
Accumulated Amortization	(1,282.1)		(1,235.8)
Carrying Value	3,990.9		4,037.2
Amortization Expense	46.3	$ 38.8
Forecasted amortization expense [Abstract]
Remainder of 2016	133.3
2017	176.3
2018	171.7
2019	167.1
2020	166.4
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	730.4		730.4
Accumulated Amortization	(357.9)		(350.1)
Carrying Value	372.5		380.3
Amortization Expense	7.8	7.5
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.4		447.4
Accumulated Amortization	(160.9)		(156.9)
Carrying Value	286.5		290.5
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	283.0		283.0
Accumulated Amortization	(197.0)		(193.2)
Carrying Value	86.0		89.8
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,485.8		2,485.8
Accumulated Amortization	(136.0)		(108.3)
Carrying Value	2,349.8		2,377.5
Amortization Expense	27.7	16.7
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,204.4		2,204.4
Accumulated Amortization	(52.1)		(39.1)
Carrying Value	2,152.3		2,165.3
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	281.4		281.4
Accumulated Amortization	(83.9)		(69.2)
Carrying Value	197.5		212.2
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,815.0		1,815.0
Accumulated Amortization	(735.9)		(727.3)
Carrying Value	1,079.1		1,087.7
Amortization Expense	8.6	9.9
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3		1,350.3
Accumulated Amortization	(372.4)		(366.3)
Carrying Value	977.9		984.0
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	464.7		464.7
Accumulated Amortization	(363.5)		(361.0)
Carrying Value	101.2		103.7
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	241.8		241.8
Accumulated Amortization	(52.3)		(50.1)
Carrying Value	189.5		191.7
Amortization Expense	2.2	2.4
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	185.5		185.5
Accumulated Amortization	(39.7)		(38.3)
Carrying Value	145.8		147.2
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	56.3		56.3
Accumulated Amortization	(12.6)		(11.8)
Carrying Value	43.7		$ 44.5
Offshore Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Amortization Expense	$ 0.0	$ 2.3

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

No definition available.

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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

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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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