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Business Segments, Consolidated Revenues and Expenses (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Consolidated Revenues [Abstract] |  |  |  |
Total consolidated revenues | $ 11,383.1 |  | $ 11,252.5 |
Operating costs and expenses: |  |  |  |
Cost of sales | 9,692.5 | [1] | 9,665.8 | [1]
Other operating costs and expenses | 504.0 | [2] | 543.9 | [2]
Depreciation, amortization and accretion | 276.8 |  | 254.6 |
Gains attributable to asset sales and insurance recoveries | (63.9) |  | (2.5) |
Non-cash asset impairment charges | 11.0 |  | 5.4 |
General and administrative costs | 49.5 |  | 46.3 |
Total consolidated costs and expenses | 10,469.9 |  | 10,513.5 |
NGL Pipelines and Services [Member] |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |
Sales of NGLs and related products | 3,665.6 |  | 4,115.3 |
Midstream services | 285.4 |  | 239.2 |
Total consolidated revenues | 3,951.0 |  | 4,354.5 |
Onshore Natural Gas Pipelines And Services [Member] |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |
Sales of natural gas | 639.5 |  | 572.6 |
Midstream services | 238.2 |  | 261.0 |
Total consolidated revenues | 877.7 |  | 833.6 |
Onshore Crude Oil Pipelines and Services [Member] |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |
Sales of crude oil | 4,742.8 |  | 4,447.6 |
Midstream services | 50.4 |  | 26.0 |
Total consolidated revenues | 4,793.2 |  | 4,473.6 |
Offshore Pipelines And Services [Member] |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |
Sales of natural gas | 0.1 |  | 0.1 |
Sales of crude oil | 2.3 |  | 1.4 |
Midstream services | 40.2 |  | 54.6 |
Total consolidated revenues | 42.6 |  | 56.1 |
Petrochemical and Refined Products Services [Member] |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |
Sales of petrochemicals and refined products | 1,547.2 |  | 1,351.2 |
Midstream services | 171.4 |  | 183.5 |
Total consolidated revenues | $ 1,718.6 |  | $ 1,534.7 |
[1] | Cost of sales is a component of "Operating costs and expenses," as presented on our Unaudited Condensed Statements of Consolidated Operations. Quarter-to-quarter 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 The amount of expense recognized and charged to operating costs and expenses in the current period that reflects the allocation of the cost of assets over the assets' useful lives. + References No definition available. + Details
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- Definition The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss) recorded in operating costs and expenses. + References No definition available. + Details
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