Intangible Assets and Goodwill, Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	$ 4,300.2	$ 2,080.0	$ 2,086.8
Purchase price and other adjustments	1,454.1
Reclassification of goodwill between segments		0.0
Reduction in goodwill related to the sale of assets	(84.1)	(0.1)	(6.8)
Addition to goodwill related to business acquisition	82.6	2,220.3
Goodwill reclassified to assets held-for-sale	(7.6)
Balance at end of period	5,745.2	4,300.2	2,080.0
Oiltanking Partners L.P. [Member]
Changes in carrying amount of goodwill [Roll Forward]
Purchase price and other adjustments	1,454.1
Addition to goodwill related to business acquisition		2,220.3
Balance at end of period	3,670.0
EFS Midstream [Member]
Changes in carrying amount of goodwill [Roll Forward]
Addition to goodwill related to business acquisition	82.6
NGL Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	2,210.2	341.2	341.2
Purchase price and other adjustments	432.6
Reclassification of goodwill between segments		520.0
Reduction in goodwill related to the sale of assets	0.0	0.0	0.0
Addition to goodwill related to business acquisition	8.9	1,349.0
Goodwill reclassified to assets held-for-sale	0.0
Balance at end of period	2,651.7	2,210.2	341.2
Crude Oil Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	918.7	305.1	311.2
Purchase price and other adjustments	850.7
Reclassification of goodwill between segments		0.0
Reduction in goodwill related to the sale of assets	(2.1)	0.0	(6.1)
Addition to goodwill related to business acquisition	73.7	613.6
Goodwill reclassified to assets held-for-sale	0.0
Balance at end of period	1,841.0	918.7	305.1
Natural Gas Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	296.3	296.3	296.3
Purchase price and other adjustments	0.0
Reclassification of goodwill between segments		0.0
Reduction in goodwill related to the sale of assets	0.0	0.0	0.0
Addition to goodwill related to business acquisition	0.0	0.0
Goodwill reclassified to assets held-for-sale	0.0
Balance at end of period	296.3	296.3	296.3
Petrochemical & Refined Products Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	793.0	1,055.3	1,056.0
Purchase price and other adjustments	170.8
Reclassification of goodwill between segments		(520.0)
Reduction in goodwill related to the sale of assets	0.0	0.0	(0.7)
Addition to goodwill related to business acquisition	0.0	257.7
Goodwill reclassified to assets held-for-sale	(7.6)
Balance at end of period	956.2	793.0	1,055.3
Offshore Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	82.0	82.1	82.1
Purchase price and other adjustments	0.0
Reclassification of goodwill between segments		0.0
Reduction in goodwill related to the sale of assets	(82.0)	(0.1)	0.0
Addition to goodwill related to business acquisition	0.0	0.0
Goodwill reclassified to assets held-for-sale	0.0
Balance at end of period	$ 0.0	$ 82.0	$ 82.1