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

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