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Inventories (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Available-for-Sale Inventory by Product Type [Abstract] |  |  |  |  |  |
NGLs | $ 579.1 us-gaap_EnergyRelatedInventoryNaturalGasLiquids |  | $ 593.8 us-gaap_EnergyRelatedInventoryNaturalGasLiquids |  |  |
Petrochemicals and refined products | 295.6 epd_EnergyRelatedInventoryPetrochemicalsAndRefinedProducts |  | 395.1 epd_EnergyRelatedInventoryPetrochemicalsAndRefinedProducts |  |  |
Crude oil | 97.8 epd_EnergyRelatedInventoryCrudeOil |  | 42.6 epd_EnergyRelatedInventoryCrudeOil |  |  |
Natural gas | 41.7 epd_EnergyRelatedInventoryNaturalGas |  | 61.6 epd_EnergyRelatedInventoryNaturalGas |  |  |
Total | 1,014.2 us-gaap_InventoryNet |  | 1,093.1 us-gaap_InventoryNet |  |  |
Summary of cost of sales and lower of cost or market adjustments [Abstract] |  |  |  |  |  |
Cost of sales | 40,464.1 us-gaap_CostOfGoodsSold | [1] | 40,770.2 us-gaap_CostOfGoodsSold | [1] | 36,015.5 us-gaap_CostOfGoodsSold | [1]
Lower of cost or market adjustments | $ 22.8 us-gaap_InventoryWriteDown |  | $ 18.5 us-gaap_InventoryWriteDown |  | $ 22.1 us-gaap_InventoryWriteDown |
[1] | Cost of sales is a component of "Operating costs and expenses," as presented on our Statements of Consolidated Operations. Year-to-year fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.

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