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Inventories (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Available-for-Sale Inventory by Product Type [Abstract] |  |  |  |  |  |  |  |  |
NGLs | $ 617.8 |  |  |  | $ 617.8 |  |  |  | $ 593.8
Petrochemicals and refined products | 300.8 |  |  |  | 300.8 |  |  |  | 395.1
Crude oil | 368.9 |  |  |  | 368.9 |  |  |  | 42.6
Natural gas | 30.8 |  |  |  | 30.8 |  |  |  | 61.6
Total | 1,318.3 |  |  |  | 1,318.3 |  |  |  | 1,093.1
Summary of cost of sales and lower of cost or market adjustments [Abstract] |  |  |  |  |  |  |  |  |
Cost of sales | 10,705.3 | [1] | 9,458.3 | [1] | 21,758.0 | [1] | 19,150.8 | [1] |
Lower of cost or market adjustments | $ 2.7 |  | $ 7.7 |  | $ 7.9 |  | $ 10.4 |  |
[1] | Cost of sales is a component of "Operating costs and expenses" as presented on our Unaudited Condensed Statements of Consolidated Operations. Period-to-period 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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