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Intangible Assets and Goodwill, Goodwill (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | $ 2,080.0 | [1] |
Reclassification of goodwill | 0 |  |
Goodwill related to the sale of assets | (0.1) |  |
Balance at end of period | 2,079.9 | [1] |
Accumulated impairment charges | 1.3 |  | 1.3
Fixed assets transferred |  |  | 73.7
NGL Pipelines & Services [Member] |  |  |
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | 341.2 |  |
Reclassification of goodwill | 520.0 |  |
Goodwill related to the sale of assets | 0 |  |
Balance at end of period | 861.2 |  |
Onshore Natural Gas Pipelines & Services [Member] |  |  |
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | 296.3 |  |
Reclassification of goodwill | 0 |  |
Goodwill related to the sale of assets | 0 |  |
Balance at end of period | 296.3 |  |
Onshore Crude Oil Pipelines & Services [Member] |  |  |
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | 305.1 |  |
Reclassification of goodwill | 0 |  |
Goodwill related to the sale of assets | 0 |  |
Balance at end of period | 305.1 |  |
Offshore Pipelines & Services [Member] |  |  |
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | 82.1 |  |
Reclassification of goodwill | 0 |  |
Goodwill related to the sale of assets | (0.1) |  |
Balance at end of period | 82.0 |  |
Petrochemical & Refined Products Services [Member] |  |  |
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | 1,055.3 |  |
Reclassification of goodwill | (520.0) |  |
Goodwill related to the sale of assets | 0 |  |
Balance at end of period | $ 535.3 |  |
[1] | The total carrying amount of goodwill at September 30, 2014 and December 31, 2013 is net of $1.3 million of accumulated impairment charges. No goodwill impairment charges were recorded during the nine months ended September 30, 2014.

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