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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

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