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Intangible Assets and Goodwill, Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Identifiable intangible assets [Abstract]
Gross Value	$ 2,599.5		$ 2,599.5		$ 2,612.2
Accumulated Amortization	(1,208.4)		(1,208.4)		(1,150.0)
Carrying Value	1,391.1		1,391.1		1,462.2
Amortization Expense	23.5	26.6	72.7	80.2
Forecasted amortization expense [Abstract]
Remainder of 2014	22.2		22.2
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	618.7		618.7		622.1
Accumulated Amortization	(354.1)		(354.1)		(336.9)
Carrying Value	264.6		264.6		285.2
Amortization Expense	8.1	8.6	25.4	27.7
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	340.8		340.8		340.8
Accumulated Amortization	(179.0)		(179.0)		(165.7)
Carrying Value	161.8		161.8		175.1
NGL Pipelines & Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	277.9		277.9		281.3
Accumulated Amortization	(175.1)		(175.1)		(171.2)
Carrying Value	102.8		102.8		110.1
Onshore Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,629.6		1,629.6		1,629.7
Accumulated Amortization	(646.0)		(646.0)		(611.9)
Carrying Value	983.6		983.6		1,017.8
Amortization Expense	11.1	13.3	34.2	38.0
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	(302.3)		(302.3)		(281.2)
Carrying Value	861.3		861.3		882.4
Onshore Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	466.0		466.0		466.1
Accumulated Amortization	(343.7)		(343.7)		(330.7)
Carrying Value	122.3		122.3		135.4
Onshore Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	10.0		10.0		11.1
Accumulated Amortization	(6.4)		(6.4)		(6.6)
Carrying Value	3.6		3.6		4.5
Amortization Expense	0.3	0.3	0.9	1.0
Onshore Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	9.6		9.6		10.7
Accumulated Amortization	(6.1)		(6.1)		(6.3)
Carrying Value	3.5		3.5		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	(153.1)		(153.1)		(150.4)
Carrying Value	43.9		43.9		54.7
Amortization Expense	2.5	2.9	7.6	8.8
Offshore Pipelines & Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	195.8		195.8		203.9
Accumulated Amortization	(152.6)		(152.6)		(150.0)
Carrying Value	43.2		43.2		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	(48.8)		(48.8)		(44.2)
Carrying Value	95.4		95.4		100.0
Amortization Expense	1.5	1.5	4.6	4.7
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	104.3		104.3		104.3
Accumulated Amortization	(42.1)		(42.1)		(38.2)
Carrying Value	62.2		62.2		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	(6.7)		(6.7)		(6.0)
Carrying Value	$ 33.2		$ 33.2		$ 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 for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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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