Intangible Assets and Goodwill, Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Identifiable intangible assets [Abstract]
Gross Value	$ 2,615.5		$ 2,616.8
Accumulated Amortization	(1,075.7)		(1,050.0)
Carrying Value	1,539.8		1,566.8
Amortization Expense	26.9	32.3
Forecasted amortization expense [Abstract]
Remainder of 2013	79.3
2014	96.1
2015	90.1
2016	91.8
2017	95.8
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	625.4		625.4
Accumulated Amortization	(314.4)		(304.8)
Carrying Value	311.0		320.6
Amortization Expense	9.6	10.2
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	340.8		340.8
Accumulated Amortization	(152.3)		(147.6)
Carrying Value	188.5		193.2
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	284.6		284.6
Accumulated Amortization	(162.1)		(157.2)
Carrying Value	122.5		127.4
Onshore Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,629.7		1,629.7
Accumulated Amortization	(574.2)		(561.8)
Carrying Value	1,055.5		1,067.9
Amortization Expense	12.4	15.8
Onshore Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,163.6		1,163.6
Accumulated Amortization	(257.8)		(250.0)
Carrying Value	905.8		913.6
Onshore Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	466.1		466.1
Accumulated Amortization	(316.4)		(311.8)
Carrying Value	149.7		154.3
Onshore Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	11.1		11.1
Accumulated Amortization	(5.5)		(5.2)
Carrying Value	5.6		5.9
Amortization Expense	0.3	0.2
Onshore Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	10.7		10.7
Accumulated Amortization	(5.2)		(4.9)
Carrying Value	5.5		5.8
Onshore Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	0.4		0.4
Accumulated Amortization	(0.3)		(0.3)
Carrying Value	0.1		0.1
Offshore Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	205.1		205.1
Accumulated Amortization	(142.0)		(138.9)
Carrying Value	63.1		66.2
Amortization Expense	3.0	2.6
Offshore Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	203.9		203.9
Accumulated Amortization	(141.6)		(138.5)
Carrying Value	62.3		65.4
Offshore Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1.2		1.2
Accumulated Amortization	(0.4)		(0.4)
Carrying Value	0.8		0.8
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	144.2		145.5
Accumulated Amortization	(39.6)		(39.3)
Carrying Value	104.6		106.2
Amortization Expense	1.6	3.5
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	104.3		104.3
Accumulated Amortization	(34.7)		(33.4)
Carrying Value	69.6		70.9
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	39.9		41.2
Accumulated Amortization	(4.9)		(5.9)
Carrying Value	$ 35.0		$ 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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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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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- Definition

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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- Definition

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.

+ References

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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.

+ References

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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.

+ References

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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.

+ References

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- Definition

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

-Name Accounting Standards Codification

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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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