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Business Segments (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) Segment Fractionator mi | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | Segment | 4 |  |
Number of miles of pipelines | 50,000 |  |
Proceeds from disposal of assets | $ | $ 40.1 | $ 46.5 | $ 1,608.6
Offshore Business [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Description of assets sold | Our Offshore Business served drilling and development regions, including deepwater production fields, in the northern Gulf of Mexico offshore Alabama, Louisiana, Mississippi and Texas and included approximately 2,350 miles of offshore natural gas and crude oil pipelines and six offshore hub platforms. |  |
Proceeds from disposal of assets | $ | $ 0.0 | $ 0.0 | $ 1,527.7
NGL Pipelines and Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of miles of pipelines | 19,600 |  |
Number of fractionators | Fractionator | 14 |  |
Crude Oil Pipelines & Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of miles of pipelines | 5,800 |  |
Natural Gas Pipelines & Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of miles of pipelines | 19,700 |  |
Petrochemical and Refined Products Services [Member] | Propylene Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of miles of pipelines | 800 |  |
Petrochemical and Refined Products Services [Member] | Refined Products Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of miles of pipelines | 4,100 |  |

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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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