Intangible Assets and Goodwill, Goodwill (Details) $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($)
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	$ 4,300.2
Reclassification of Oiltanking IDR balances to goodwill in connection with the cancellation of such rights and other adjustments	1,454.1
Reduction in goodwill related to the sale of assets	(84.1)
Addition to goodwill related to the acquisition of EFS Midstream	82.6
Goodwill reclassified to assets held-for-sale	(7.6)
Balance at end of period	5,745.2
Oiltanking Partners L.P. [Member]
Changes in carrying amount of goodwill [Roll Forward]
Reclassification of Oiltanking IDR balances to goodwill in connection with the cancellation of such rights and other adjustments	1,450.0
Balance at end of period	3,670.0
EFS Midstream [Member]
Changes in carrying amount of goodwill [Roll Forward]
Addition to goodwill related to the acquisition of EFS Midstream	82.6
NGL Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	2,210.2
Reclassification of Oiltanking IDR balances to goodwill in connection with the cancellation of such rights and other adjustments	432.6
Reduction in goodwill related to the sale of assets	0.0
Addition to goodwill related to the acquisition of EFS Midstream	8.9
Goodwill reclassified to assets held-for-sale	0.0
Balance at end of period	2,651.7
Crude Oil Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	918.7
Reclassification of Oiltanking IDR balances to goodwill in connection with the cancellation of such rights and other adjustments	850.7
Reduction in goodwill related to the sale of assets	(2.1)
Addition to goodwill related to the acquisition of EFS Midstream	73.7
Goodwill reclassified to assets held-for-sale	0.0
Balance at end of period	1,841.0
Natural Gas Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	296.3
Reclassification of Oiltanking IDR balances to goodwill in connection with the cancellation of such rights and other adjustments	0.0
Reduction in goodwill related to the sale of assets	0.0
Addition to goodwill related to the acquisition of EFS Midstream	0.0
Goodwill reclassified to assets held-for-sale	0.0
Balance at end of period	296.3
Petrochemical & Refined Products Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	793.0
Reclassification of Oiltanking IDR balances to goodwill in connection with the cancellation of such rights and other adjustments	170.8
Reduction in goodwill related to the sale of assets	0.0
Addition to goodwill related to the acquisition of EFS Midstream	0.0
Goodwill reclassified to assets held-for-sale	(7.6)
Balance at end of period	956.2
Offshore Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	82.0
Reclassification of Oiltanking IDR balances to goodwill in connection with the cancellation of such rights and other adjustments	0.0
Reduction in goodwill related to the sale of assets	(82.0)
Addition to goodwill related to the acquisition of EFS Midstream	0.0
Goodwill reclassified to assets held-for-sale	0.0
Balance at end of period	$ 0.0

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
-Subparagraph (a)
-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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

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