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Intangible Assets and Goodwill, Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Identifiable intangible assets [Abstract]
Gross Value	$ 2,611.2		$ 2,611.2		$ 2,616.8
Accumulated Amortization	(1,098.0)		(1,098.0)		(1,050.0)
Carrying Value	1,513.2		1,513.2		1,566.8
Amortization Expense	26.7	31.3	53.6	63.6
Forecasted amortization expense [Abstract]
Remainder of 2013	51.7		51.7
2014	96.2		96.2
2015	90.3		90.3
2016	92.0		92.0
2017	96.0		96.0
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	621.1		621.1		625.4
Accumulated Amortization	(319.6)		(319.6)		(304.8)
Carrying Value	301.5		301.5		320.6
Amortization Expense	9.5	9.6	19.1	19.8
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	340.8		340.8		340.8
Accumulated Amortization	(156.8)		(156.8)		(147.6)
Carrying Value	184.0		184.0		193.2
NGL Pipelines & Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	280.3		280.3		284.6
Accumulated Amortization	(162.8)		(162.8)		(157.2)
Carrying Value	117.5		117.5		127.4
Onshore Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,629.7		1,629.7		1,629.7
Accumulated Amortization	(586.5)		(586.5)		(561.8)
Carrying Value	1,043.2		1,043.2		1,067.9
Amortization Expense	12.3	15.8	24.7	31.6
Onshore Natural Gas Pipelines & Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,163.6		1,163.6		1,163.6
Accumulated Amortization	(265.3)		(265.3)		(250.0)
Carrying Value	898.3		898.3		913.6
Onshore Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	466.1		466.1		466.1
Accumulated Amortization	(321.2)		(321.2)		(311.8)
Carrying Value	144.9		144.9		154.3
Onshore Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	11.1		11.1		11.1
Accumulated Amortization	(5.9)		(5.9)		(5.2)
Carrying Value	5.2		5.2		5.9
Amortization Expense	0.4	0.1	0.7	0.3
Onshore Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	10.7		10.7		10.7
Accumulated Amortization	(5.6)		(5.6)		(4.9)
Carrying Value	5.1		5.1		5.8
Onshore Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	0.4		0.4		0.4
Accumulated Amortization	(0.3)		(0.3)		(0.3)
Carrying Value	0.1		0.1		0.1
Offshore Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	205.1		205.1		205.1
Accumulated Amortization	(144.9)		(144.9)		(138.9)
Carrying Value	60.2		60.2		66.2
Amortization Expense	2.9	2.6	5.9	5.2
Offshore Pipelines & Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	203.9		203.9		203.9
Accumulated Amortization	(144.5)		(144.5)		(138.5)
Carrying Value	59.4		59.4		65.4
Offshore Pipelines & Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1.2		1.2		1.2
Accumulated Amortization	(0.4)		(0.4)		(0.4)
Carrying Value	0.8		0.8		0.8
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	144.2		144.2		145.5
Accumulated Amortization	(41.1)		(41.1)		(39.3)
Carrying Value	103.1		103.1		106.2
Amortization Expense	1.6	3.2	3.2	6.7
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	104.3		104.3		104.3
Accumulated Amortization	(35.9)		(35.9)		(33.4)
Carrying Value	68.4		68.4		70.9
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	39.9		39.9		41.2
Accumulated Amortization	(5.2)		(5.2)		(5.9)
Carrying Value	$ 34.7		$ 34.7		$ 35.3

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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 expected to be recognized in the remainder of the fiscal year following the latest fiscal year ended for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for 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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