Intangible Assets and Goodwill, Goodwill (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	$ 4,300.2
Purchase price and other adjustments	1,454.1
Reduction in goodwill related to the sale of assets	(82.0)
Addition to goodwill related to the acquisition of EFS Midstream	82.3
Goodwill reclassified to assets held-for-sale	(5.4)
Balance at end of period	5,749.2	$ 4,300.2
Oiltanking Partners L.P. - Step 1 [Member]
Changes in carrying amount of goodwill [Roll Forward]
Purchase price and other adjustments		100.3
NGL Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	2,210.2
Purchase price 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	2,210.2
NGL Pipelines & Services [Member] \| Oiltanking Partners L.P. - Step 1 [Member]
Changes in carrying amount of goodwill [Roll Forward]
Purchase price and other adjustments		29.8
Crude Oil Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	918.7
Purchase price and other adjustments	850.7
Reduction in goodwill related to the sale of assets	0.0
Addition to goodwill related to the acquisition of EFS Midstream	73.4
Goodwill reclassified to assets held-for-sale	0.0
Balance at end of period	1,842.8	918.7
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		58.8
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
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	296.3
Petrochemical & Refined Products Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	793.0
Purchase price 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	(5.4)
Balance at end of period	958.4	793.0
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		11.7
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
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	$ 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

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