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Inventories (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Available-for-Sale Inventory by Product Type [Abstract] |  |  |  |  |
NGLs | $ 531.4 |  |  |  | $ 594.3
Petrochemicals and refined products | 443.3 |  |  |  | 304.5
Crude oil | 165.6 |  |  |  | 119.4
Natural gas | 18.8 |  |  |  | 70.2
Total | 1,159.1 |  |  |  | 1,088.4
Summary of cost of sales and lower of cost or market adjustments [Abstract] |  |  |  |  |
Cost of sales | 9,692.5 | [1] | 9,665.8 | [1] |
Lower of cost or market adjustments | $ 2.7 |  | $ 5.9 |  |
[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.

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