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.

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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 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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Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Identifiable intangible assets [Abstract]
Gross Value	$ 5,273.1		$ 5,273.1		$ 5,273.0
Accumulated Amortization	(1,365.9)		(1,365.9)		(1,235.8)
Carrying Value	3,907.2		3,907.2		4,037.2
Amortization Expense	41.2	$ 51.7	130.5	$ 129.2
Forecasted amortization expense [Abstract]
Remainder of 2016	44.6		44.6
2017	176.4		176.4
2018	171.8		171.8
2019	167.3		167.3
2020	166.4		166.4
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	730.9		730.9		730.4
Accumulated Amortization	(373.2)		(373.2)		(350.1)
Carrying Value	357.7		357.7		380.3
Amortization Expense	7.6	9.7	23.1	24.9
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.4		447.4		447.4
Accumulated Amortization	(168.9)		(168.9)		(156.9)
Carrying Value	278.5		278.5		290.5
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	283.5		283.5		283.0
Accumulated Amortization	(204.3)		(204.3)		(193.2)
Carrying Value	79.2		79.2		89.8
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,485.4		2,485.4		2,485.8
Accumulated Amortization	(183.5)		(183.5)		(108.3)
Carrying Value	2,301.9		2,301.9		2,377.5
Amortization Expense	23.2	29.0	75.6	62.3
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,204.4		2,204.4		2,204.4
Accumulated Amortization	(74.2)		(74.2)		(39.1)
Carrying Value	2,130.2		2,130.2		2,165.3
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	281.0		281.0		281.4
Accumulated Amortization	(109.3)		(109.3)		(69.2)
Carrying Value	171.7		171.7		212.2
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,815.0		1,815.0		1,815.0
Accumulated Amortization	(752.3)		(752.3)		(727.3)
Carrying Value	1,062.7		1,062.7		1,087.7
Amortization Expense	8.1	10.7	25.0	30.5
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3		1,350.3		1,350.3
Accumulated Amortization	(384.1)		(384.1)		(366.3)
Carrying Value	966.2		966.2		984.0
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	464.7		464.7		464.7
Accumulated Amortization	(368.2)		(368.2)		(361.0)
Carrying Value	96.5		96.5		103.7
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	241.8		241.8		241.8
Accumulated Amortization	(56.9)		(56.9)		(50.1)
Carrying Value	184.9		184.9		191.7
Amortization Expense	2.3	2.3	6.8	7.0
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	185.5		185.5		185.5
Accumulated Amortization	(42.5)		(42.5)		(38.3)
Carrying Value	143.0		143.0		147.2
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	56.3		56.3		56.3
Accumulated Amortization	(14.4)		(14.4)		(11.8)
Carrying Value	41.9		41.9		$ 44.5
Offshore Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Amortization Expense	$ 0.0	$ 0.0	$ 0.0	$ 4.5