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Business Segments, Consolidated Revenues and Expenses (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Consolidated Revenues [Abstract] |  |  |
Total consolidated revenues |  | $ 5,005.3 | $ 7,472.5
Operating costs and expenses: |  |  |
Cost of sales | [1] | 3,208.3 | 5,678.1
Other operating costs and expenses | [2] | 573.8 | 559.8
Depreciation, amortization and accretion |  | 358.2 | 345.3
Net losses (gains) attributable to asset sales |  | 4.9 | (0.1)
Non-cash asset impairment charges |  | 1.7 | 33.3
General and administrative costs |  | 43.9 | 49.3
Total consolidated costs and expenses |  | 4,190.8 | 6,665.7
NGL Pipelines & Services [Member] |  |  |
Consolidated Revenues [Abstract] |  |  |
Sales of NGLs and related products |  | 1,943.5 | 2,242.2
Midstream services |  | 460.3 | 434.1
Total consolidated revenues |  | 2,403.8 | 2,676.3
Crude Oil Pipelines & Services [Member] |  |  |
Consolidated Revenues [Abstract] |  |  |
Sales of crude oil |  | 1,121.1 | 2,570.7
Midstream services |  | 167.5 | 107.3
Total consolidated revenues |  | 1,288.6 | 2,678.0
Natural Gas Pipelines & Services [Member] |  |  |
Consolidated Revenues [Abstract] |  |  |
Sales of natural gas |  | 315.0 | 476.3
Midstream services |  | 235.0 | 257.6
Total consolidated revenues |  | 550.0 | 733.9
Petrochemical & Refined Products Services [Member] |  |  |
Consolidated Revenues [Abstract] |  |  |
Sales of petrochemicals and refined products |  | 553.2 | 1,151.0
Midstream services |  | 209.7 | 198.1
Total consolidated revenues |  | 762.9 | 1,349.1
Offshore Pipelines & Services [Member] |  |  |
Consolidated Revenues [Abstract] |  |  |
Sales of crude oil |  | 0.0 | 1.1
Midstream services |  | 0.0 | 34.1
Total consolidated revenues |  | $ 0.0 | $ 35.2
[1] | Cost of sales is a component of "Operating costs and expenses" as presented on our Unaudited Condensed Statements of Consolidated Operations. Fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.
[2] | Represents cost of operating our plants, pipelines and other fixed assets, excluding depreciation, amortization and accretion charges.

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- Definition Amount of write-down of assets recognized in the income statement in costs and expenses. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References No definition available. + Details
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