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 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 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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Identifiable intangible assets [Abstract]
Gross Value	$ 5,266.3		$ 5,266.3		$ 5,267.2
Accumulated Amortization	(1,483.9)		(1,483.9)		(1,403.1)
Carrying Value	3,782.4		3,782.4		3,864.1
Amortization expense	40.7	$ 43.0	81.7	$ 89.3
Forecasted amortization expense [Abstract]
Remainder of 2017	81.1		81.1
2018	163.8		163.8
2019	157.7		157.7
2020	152.8		152.8
2021	163.2		163.2
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	727.3		727.3		727.3
Accumulated Amortization	(391.7)		(391.7)		(377.1)
Carrying Value	335.6		335.6		350.2
Amortization expense	7.3	7.7	14.6	15.5
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.4		447.4		447.4
Accumulated Amortization	(180.0)		(180.0)		(172.7)
Carrying Value	267.4		267.4		274.7
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	279.9		279.9		279.9
Accumulated Amortization	(211.7)		(211.7)		(204.4)
Carrying Value	68.2		68.2		75.5
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,484.5		2,484.5		2,485.4
Accumulated Amortization	(250.9)		(250.9)		(206.4)
Carrying Value	2,233.6		2,233.6		2,279.0
Amortization expense	22.3	24.7	45.4	52.4
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,203.5		2,203.5		2,204.4
Accumulated Amortization	(104.4)		(104.4)		(84.5)
Carrying Value	2,099.1		2,099.1		2,119.9
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	281.0		281.0		281.0
Accumulated Amortization	(146.5)		(146.5)		(121.9)
Carrying Value	134.5		134.5		159.1
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,815.0		1,815.0		1,815.0
Accumulated Amortization	(777.5)		(777.5)		(760.5)
Carrying Value	1,037.5		1,037.5		1,054.5
Amortization expense	8.8	8.3	17.0	16.9
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	(402.5)		(402.5)		(390.0)
Carrying Value	947.8		947.8		960.3
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	464.7		464.7		464.7
Accumulated Amortization	(375.0)		(375.0)		(370.5)
Carrying Value	89.7		89.7		94.2
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	239.5		239.5		239.5
Accumulated Amortization	(63.8)		(63.8)		(59.1)
Carrying Value	175.7		175.7		180.4
Amortization expense	2.3	$ 2.3	4.7	$ 4.5
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	185.5		185.5		185.5
Accumulated Amortization	(46.9)		(46.9)		(43.9)
Carrying Value	138.6		138.6		141.6
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	54.0		54.0		54.0
Accumulated Amortization	(16.9)		(16.9)		(15.2)
Carrying Value	$ 37.1		$ 37.1		$ 38.8