Intangible Assets and Goodwill, Goodwill (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2015	Dec. 31, 2014
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	$ 4,292.7
Purchase price and other adjustments	1,454.1
Goodwill reclassified to assets held for sale	(82.0)
Balance at end of period	5,664.8	$ 4,292.7
Oiltanking Partners L.P. - Step 1 [Member]
Changes in carrying amount of goodwill [Roll Forward]
Purchase price and other adjustments		92.8
NGL Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	2,207.9
Purchase price and other adjustments	432.6
Goodwill reclassified to assets held for sale	0.0
Balance at end of period	2,640.5	2,207.9
NGL Pipelines & Services [Member] \| Oiltanking Partners L.P. - Step 1 [Member]
Changes in carrying amount of goodwill [Roll Forward]
Purchase price and other adjustments		27.5
Crude Oil Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	914.3
Purchase price and other adjustments	850.7
Goodwill reclassified to assets held for sale	0.0
Balance at end of period	1,765.0	914.3
Crude Oil Pipelines & Services [Member] \| Oiltanking Partners L.P. - Step 1 [Member]
Changes in carrying amount of goodwill [Roll Forward]
Purchase price and other adjustments		54.4
Natural Gas Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	296.3
Purchase price and other adjustments	0.0
Goodwill reclassified to assets held for sale	0.0
Balance at end of period	296.3	296.3
Petrochemical & Refined Products Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	792.2
Purchase price and other adjustments	170.8
Goodwill reclassified to assets held for sale	0.0
Balance at end of period	963.0	792.2
Petrochemical & Refined Products Services [Member] \| Oiltanking Partners L.P. - Step 1 [Member]
Changes in carrying amount of goodwill [Roll Forward]
Purchase price and other adjustments		10.9
Offshore Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	82.0
Purchase price and other adjustments	0.0
Goodwill reclassified to assets held for sale	(82.0)
Balance at end of period	$ 0.0	$ 82.0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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Amount of other (increase) decrease of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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-Paragraph 1

-Subparagraph (g)

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