Intangible Assets and Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Identifiable intangible assets [Abstract]
Gross Value	$ 2,632.1		$ 2,646.6
Accum. Amort.	(987.9)		(990.4)
Carrying Value	1,644.2		1,656.2
Amortization Expense	32.3	37.7
Forecasted amortization expense [Abstract]
Remainder of 2012	89.8
2013	110.7
2014	107.0
2015	106.5
2016	107.6
NGL Pipelines and Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	625.5		639.2
Accum. Amort.	(275.4)		(297.9)
Carrying Value	350.1		341.3
Amortization Expense	10.2	10.4
NGL Pipelines and Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	340.8		340.8
Accum. Amort.	(133.0)		(128.2)
Carrying Value	207.8		212.6
NGL Pipelines and Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	284.7		298.4
Accum. Amort.	(142.4)		(169.7)
Carrying Value	142.3		128.7
Onshore Natural Gas Pipelines And Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,629.7		1,628.4
Accum. Amort.	(516.4)		(500.6)
Carrying Value	1,113.3		1,127.8
Amortization Expense	15.8	19.9
Onshore Natural Gas Pipelines And Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,163.6		1,163.6
Accum. Amort.	(220.2)		(209.7)
Carrying Value	943.4		953.9
Onshore Natural Gas Pipelines And Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	466.1		464.8
Accum. Amort.	(296.2)		(290.9)
Carrying Value	169.9		173.9
Onshore Crude Oil Pipelines and Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	10.1		10.1
Accum. Amort.	(4.5)		(4.3)
Carrying Value	5.6		5.8
Amortization Expense	0.2	0.1
Onshore Crude Oil Pipelines and Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	9.7		9.7
Accum. Amort.	(4.3)		(4.1)
Carrying Value	5.4		5.6
Onshore Crude Oil Pipelines and Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	0.4		0.4
Accum. Amort.	(0.2)		(0.2)
Carrying Value	0.2		0.2
Offshore Pipelines And Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	207.0		207.0
Accum. Amort.	(132.1)		(129.5)
Carrying Value	74.9		77.5
Amortization Expense	2.6	3.0
Offshore Pipelines And Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	205.8		205.8
Accum. Amort.	(131.8)		(129.2)
Carrying Value	74.0		76.6
Offshore Pipelines And Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1.2		1.2
Accum. Amort.	(0.3)		(0.3)
Carrying Value	0.9		0.9
Petrochemical and Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	159.8		161.9
Accum. Amort.	(59.5)		(58.1)
Carrying Value	100.3		103.8
Amortization Expense	3.5	4.3
Petrochemical and Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	104.3		104.3
Accum. Amort.	(29.6)		(28.4)
Carrying Value	74.7		75.9
Petrochemical and Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	55.5		57.6
Accum. Amort.	(29.9)		(29.7)
Carrying Value	$ 25.6		$ 27.9

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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.

+ References

No definition available.

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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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