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Inventories | 12 Months Ended
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Dec. 31, 2015
Inventories [Abstract] |
Inventories | Note 4. Inventories Our inventory amounts by product type were as follows at the dates indicated:
|  | December 31, |
|  | 2015 |  |  | 2014 |
NGLs |  | $ | 639.9 |  |  | $ | 579.1 |
Petrochemicals and refined products |  |  | 148.0 |  |  |  | 295.6 |
Crude oil |  |  | 222.1 |  |  |  | 97.8 |
Natural gas |  |  | 28.1 |  |  |  | 41.7 |
Total |  | $ | 1,038.1 |  |  | $ | 1,014.2 |
In those instances where we take ownership of inventory volumes through percent-of-liquids contracts and similar arrangements (as opposed to outright purchases from third parties for cash), these volumes are valued at market-based prices during the month in which they are acquired. The following table presents our total cost of sales amounts and lower of cost or market adjustments for the periods indicated:
| For the Year Ended December 31, |
| 2015 |  | 2014 |  | 2013 |
Cost of sales (1) |  | $ | 19,612.9 |  |  | $ | 40,464.1 |  |  | $ | 40,770.2 |
Lower of cost or market adjustments within cost of sales |  |  | 19.8 |  |  |  | 22.8 |  |  |  | 18.5 |
(1) Cost of sales is a component of "Operating costs and expenses," as presented on our 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. |
Due to fluctuating commodity prices, we recognize lower of cost or market adjustments when the carrying value of our available-for-sale inventories exceeds their net realizable value. These non-cash charges are a component of cost of sales in the period they are recognized. To the extent our commodity hedging strategies address inventory-related price risks and are successful, these inventory valuation adjustments are mitigated or offset. See Note 14 for a description of our commodity hedging activities.

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- Definition The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a, b, c -Article 5 + Details
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