Intangible Assets and Goodwill, Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Identifiable intangible assets [Abstract]
Gross Value	$ 5,548.4	$ 2,612.2
Accumulated Amortization	(1,246.3)	(1,150.0)
Carrying Value	4,302.1	1,462.2	1,566.8
Amortization Expense	110.6us-gaap_AmortizationOfIntangibleAssets	105.6us-gaap_AmortizationOfIntangibleAssets	125.7us-gaap_AmortizationOfIntangibleAssets
Forecasted amortization expense [Abstract]
2015	150.5
2016	152.3
2017	149.3
2018	142.7
2019	131.3
Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	2,310.0
Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	534.3
Incentive distribution rights [Member]
Identifiable intangible assets [Abstract]
Carrying Value	1,460.0
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,051.1	622.1
Accumulated Amortization	(361.9)	(336.9)
Carrying Value	689.2	285.2
Amortization Expense	33.1	36.4	39.7
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	340.8	340.8
Accumulated Amortization	(183.2)	(165.7)
Carrying Value	157.6	175.1
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	277.7	281.3
Accumulated Amortization	(178.7)	(171.2)
Carrying Value	99.0	110.1
NGL Pipelines & Services [Member] \| Incentive distribution rights [Member]
Identifiable intangible assets [Abstract]
Gross Value	432.6	0
Accumulated Amortization	0	0
Carrying Value	432.6	0
Onshore Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,629.6	1,629.7
Accumulated Amortization	(656.7)	(611.9)
Carrying Value	972.9	1,017.8
Amortization Expense	45.0	50.1	63.4
Onshore Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,163.6	1,163.6
Accumulated Amortization	(308.9)	(281.2)
Carrying Value	854.7	882.4
Onshore Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	466.0	466.1
Accumulated Amortization	(347.8)	(330.7)
Carrying Value	118.2	135.4
Onshore Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,244.8	11.1
Accumulated Amortization	(21.2)	(6.6)
Carrying Value	2,223.6	4.5
Amortization Expense	15.7	1.4	0.9
Onshore Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,108.0	10.7
Accumulated Amortization	(7.7)	(6.3)
Carrying Value	1,100.3	4.4
Onshore Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	281.4	0.4
Accumulated Amortization	(13.5)	(0.3)
Carrying Value	267.9	0.1
Onshore Crude Oil Pipelines & Services [Member] \| Incentive distribution rights [Member]
Identifiable intangible assets [Abstract]
Gross Value	855.4	0
Accumulated Amortization	0	0
Carrying Value	855.4	0
Offshore Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	197.0	205.1
Accumulated Amortization	(155.4)	(150.4)
Carrying Value	41.6	54.7
Amortization Expense	9.9	11.5	11.3
Offshore Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	195.8	203.9
Accumulated Amortization	(154.9)	(150.0)
Carrying Value	40.9	53.9
Offshore Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1.2	1.2
Accumulated Amortization	(0.5)	(0.4)
Carrying Value	0.7	0.8
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	425.9	144.2
Accumulated Amortization	(51.1)	(44.2)
Carrying Value	374.8	100.0
Amortization Expense	6.9	6.2	10.4
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	198.4	104.3
Accumulated Amortization	(43.3)	(38.2)
Carrying Value	155.1	66.1
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	56.3	39.9
Accumulated Amortization	(7.8)	(6.0)
Carrying Value	48.5	33.9
Petrochemical & Refined Products Services [Member] \| Incentive distribution rights [Member]
Identifiable intangible assets [Abstract]
Gross Value	171.2	0
Accumulated Amortization	0	0
Carrying Value	$ 171.2	$ 0

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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 Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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- Definition

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

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next 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.

+ References