Intangible Assets and Goodwill, Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Identifiable intangible assets [Abstract]
Gross Value	$ 2,604.1		$ 2,612.2
Accumulated Amortization	(1,169.7)		(1,150.0)
Carrying Value	1,434.4		1,462.2
Amortization Expense	24.7	26.9
Forecasted amortization expense [Abstract]
Remainder of 2014	69.3
2015	85.3
2016	80.9
2017	85.4
2018	88.8
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	622.1		622.1
Accumulated Amortization	(345.5)		(336.9)
Carrying Value	276.6		285.2
Amortization Expense	8.6	9.6
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	340.8		340.8
Accumulated Amortization	(170.3)		(165.7)
Carrying Value	170.5		175.1
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	281.3		281.3
Accumulated Amortization	(175.2)		(171.2)
Carrying Value	106.1		110.1
Onshore Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,629.7		1,629.7
Accumulated Amortization	(623.5)		(611.9)
Carrying Value	1,006.2		1,017.8
Amortization Expense	11.6	12.4
Onshore Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,163.6		1,163.6
Accumulated Amortization	(288.5)		(281.2)
Carrying Value	875.1		882.4
Onshore Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	466.1		466.1
Accumulated Amortization	(335.0)		(330.7)
Carrying Value	131.1		135.4
Onshore Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	11.1		11.1
Accumulated Amortization	(6.9)		(6.6)
Carrying Value	4.2		4.5
Amortization Expense	0.3	0.3
Onshore Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	10.7		10.7
Accumulated Amortization	(6.6)		(6.3)
Carrying Value	4.1		4.4
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	197.0		205.1
Accumulated Amortization	(148.0)		(150.4)
Carrying Value	49.0		54.7
Amortization Expense	2.6	3.0
Offshore Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	195.8		203.9
Accumulated Amortization	(147.6)		(150.0)
Carrying Value	48.2		53.9
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		144.2
Accumulated Amortization	(45.8)		(44.2)
Carrying Value	98.4		100.0
Amortization Expense	1.6	1.6
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	104.3		104.3
Accumulated Amortization	(39.5)		(38.2)
Carrying Value	64.8		66.1
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	39.9		39.9
Accumulated Amortization	(6.3)		(6.0)
Carrying Value	$ 33.6		$ 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.

+ 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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