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 accumulated amortization of intangible assets, excluding goodwill.

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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Identifiable intangible assets [Abstract]
Gross Value	$ 5,265.1		$ 5,265.1		$ 5,267.2
Accumulated Amortization	(1,525.3)		(1,525.3)		(1,403.1)
Carrying Value	3,739.8		3,739.8		3,864.1
Amortization expense	41.4	$ 41.2	123.1	$ 130.5
Forecasted amortization expense [Abstract]
Remainder of 2017	40.8		40.8
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	726.6		726.6		727.3
Accumulated Amortization	(398.9)		(398.9)		(377.1)
Carrying Value	327.7		327.7		350.2
Amortization expense	7.2	7.6	21.8	23.1
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.4		447.4		447.4
Accumulated Amortization	(183.8)		(183.8)		(172.7)
Carrying Value	263.6		263.6		274.7
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	279.2		279.2		279.9
Accumulated Amortization	(215.1)		(215.1)		(204.4)
Carrying Value	64.1		64.1		75.5
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,484.5		2,484.5		2,485.4
Accumulated Amortization	(273.5)		(273.5)		(206.4)
Carrying Value	2,211.0		2,211.0		2,279.0
Amortization expense	22.6	23.2	68.0	75.6
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	(114.7)		(114.7)		(84.5)
Carrying Value	2,088.8		2,088.8		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	(158.8)		(158.8)		(121.9)
Carrying Value	122.2		122.2		159.1
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,815.0		1,815.0		1,815.0
Accumulated Amortization	(786.8)		(786.8)		(760.5)
Carrying Value	1,028.2		1,028.2		1,054.5
Amortization expense	9.3	8.1	26.3	25.0
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	(409.5)		(409.5)		(390.0)
Carrying Value	940.8		940.8		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	(377.3)		(377.3)		(370.5)
Carrying Value	87.4		87.4		94.2
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	239.0		239.0		239.5
Accumulated Amortization	(66.1)		(66.1)		(59.1)
Carrying Value	172.9		172.9		180.4
Amortization expense	2.3	$ 2.3	7.0	$ 6.8
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	185.5		185.5		185.5
Accumulated Amortization	(48.4)		(48.4)		(43.9)
Carrying Value	137.1		137.1		141.6
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	53.5		53.5		54.0
Accumulated Amortization	(17.7)		(17.7)		(15.2)
Carrying Value	$ 35.8		$ 35.8		$ 38.8