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Intangible Assets and Goodwill, Goodwill (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | $ 2,086.8 | [1] |
Goodwill related to the sale of assets | (6.8) |  |
Balance at end of period | 2,080.0 | [1] |
Accumulated impairment charges | 1.3 |  | 1.3
NGL Pipelines & Services [Member] |  |  |
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | 341.2 | [1] |
Goodwill related to the sale of assets | 0 |  |
Balance at end of period | 341.2 | [1] |
Onshore Natural Gas Pipelines & Services [Member] |  |  |
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | 296.3 | [1] |
Goodwill related to the sale of assets | 0 |  |
Balance at end of period | 296.3 | [1] |
Onshore Crude Oil Pipelines & Services [Member] |  |  |
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | 311.2 | [1] |
Goodwill related to the sale of assets | (6.1) |  |
Balance at end of period | 305.1 | [1] |
Offshore Pipelines & Services [Member] |  |  |
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | 82.1 | [1] |
Goodwill related to the sale of assets | 0 |  |
Balance at end of period | 82.1 | [1] |
Petrochemical & Refined Products Services [Member] |  |  |
Changes in carrying amount of goodwill [Roll Forward] |  |  |
Balance at beginning of period | 1,056.0 | [1] |
Goodwill related to the sale of assets | (0.7) |  |
Balance at end of period | $ 1,055.3 | [1] |
[1] | The total carrying amount of goodwill at September 30, 2013 and December 31, 2012 is net of $1.3 million of accumulated impairment charges. No goodwill impairment charges were recorded during the nine months ended September 30, 2013.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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