Intangible Assets and Goodwill, Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Identifiable intangible assets [Abstract]
Gross Value	$ 2,616.8	$ 2,646.6
Accumulated Amortization	(1,050.0)	(990.4)
Carrying Value	1,566.8	1,656.2	1,841.7
Amortization Expense	125.7	147.0	137.6
Forecasted amortization expense [Abstract]
2013	107.9
2014	96.2
2015	90.3
2016	92.1
2017	96.0
Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	1,250.0
Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	317.9
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	625.4	639.2
Accumulated Amortization	(304.8)	(297.9)
Carrying Value	320.6	341.3	379.7
Amortization Expense	39.7	41.1	40.1
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	340.8	340.8
Accumulated Amortization	(147.6)	(128.2)
Carrying Value	193.2	212.6
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	284.6	298.4
Accumulated Amortization	(157.2)	(169.7)
Carrying Value	127.4	128.7
Onshore Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,629.7	1,628.4
Accumulated Amortization	(561.8)	(500.6)
Carrying Value	1,067.9	1,127.8	1,246.1
Amortization Expense	63.4	77.1	72.7
Onshore Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,163.6	1,163.6
Accumulated Amortization	(250.0)	(209.7)
Carrying Value	913.6	953.9
Onshore Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	466.1	464.8
Accumulated Amortization	(311.8)	(290.9)
Carrying Value	154.3	173.9
Onshore Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	11.1	10.1
Accumulated Amortization	(5.2)	(4.3)
Carrying Value	5.9	5.8	6.2
Amortization Expense	0.9	0.4	0.4
Onshore Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	10.7	9.7
Accumulated Amortization	(4.9)	(4.1)
Carrying Value	5.8	5.6
Onshore Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	0.4	0.4
Accumulated Amortization	(0.3)	(0.2)
Carrying Value	0.1	0.2
Offshore Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	205.1	207.0
Accumulated Amortization	(138.9)	(129.5)
Carrying Value	66.2	77.5	88.7
Amortization Expense	11.3	11.2	12.8
Offshore Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	203.9	205.8
Accumulated Amortization	(138.5)	(129.2)
Carrying Value	65.4	76.6
Offshore Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1.2	1.2
Accumulated Amortization	(0.4)	(0.3)
Carrying Value	0.8	0.9
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	145.5	161.9
Accumulated Amortization	(39.3)	(58.1)
Carrying Value	106.2	103.8	121.0
Amortization Expense	10.4	17.2	11.6
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	104.3	104.3
Accumulated Amortization	(33.4)	(28.4)
Carrying Value	70.9	75.9
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	41.2	57.6
Accumulated Amortization	(5.9)	(29.7)
Carrying Value	$ 35.3	$ 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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

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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 during the next 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 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.

+ References

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

-Publisher FASB

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