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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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Identifiable intangible assets [Abstract]
Gross Value	$ 2,609.2		$ 2,609.2		$ 2,612.2
Accumulated Amortization	(1,194.3)		(1,194.3)		(1,150.0)
Carrying Value	1,414.9		1,414.9		1,462.2
Amortization Expense	24.5	26.7	49.2	53.6
Forecasted amortization expense [Abstract]
Remainder of 2014	45.5		45.5
2015	86.0		86.0
2016	81.6		81.6
2017	86.1		86.1
2018	89.5		89.5
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	627.2		627.2		622.1
Accumulated Amortization	(354.2)		(354.2)		(336.9)
Carrying Value	273.0		273.0		285.2
Amortization Expense	8.7	9.5	17.3	19.1
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	340.8		340.8		340.8
Accumulated Amortization	(174.8)		(174.8)		(165.7)
Carrying Value	166.0		166.0		175.1
NGL Pipelines & Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	286.4		286.4		281.3
Accumulated Amortization	(179.4)		(179.4)		(171.2)
Carrying Value	107.0		107.0		110.1
Onshore Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,629.7		1,629.7		1,629.7
Accumulated Amortization	(635.0)		(635.0)		(611.9)
Carrying Value	994.7		994.7		1,017.8
Amortization Expense	11.5	12.3	23.1	24.7
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	(295.5)		(295.5)		(281.2)
Carrying Value	868.1		868.1		882.4
Onshore Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	466.1		466.1		466.1
Accumulated Amortization	(339.5)		(339.5)		(330.7)
Carrying Value	126.6		126.6		135.4
Onshore Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	11.1		11.1		11.1
Accumulated Amortization	(7.2)		(7.2)		(6.6)
Carrying Value	3.9		3.9		4.5
Amortization Expense	0.3	0.4	0.6	0.7
Onshore Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	10.7		10.7		10.7
Accumulated Amortization	(6.9)		(6.9)		(6.3)
Carrying Value	3.8		3.8		4.4
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	197.0		197.0		205.1
Accumulated Amortization	(150.6)		(150.6)		(150.4)
Carrying Value	46.4		46.4		54.7
Amortization Expense	2.5	2.9	5.1	5.9
Offshore Pipelines & Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	195.8		195.8		203.9
Accumulated Amortization	(150.1)		(150.1)		(150.0)
Carrying Value	45.7		45.7		53.9
Offshore Pipelines & Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1.2		1.2		1.2
Accumulated Amortization	(0.5)		(0.5)		(0.4)
Carrying Value	0.7		0.7		0.8
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	144.2		144.2		144.2
Accumulated Amortization	(47.3)		(47.3)		(44.2)
Carrying Value	96.9		96.9		100.0
Amortization Expense	1.5	1.6	3.1	3.2
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	104.3		104.3		104.3
Accumulated Amortization	(40.8)		(40.8)		(38.2)
Carrying Value	63.5		63.5		66.1
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	39.9		39.9		39.9
Accumulated Amortization	(6.5)		(6.5)		(6.0)
Carrying Value	$ 33.4		$ 33.4		$ 33.9

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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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