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Inventories (Tables)
 6 Months Ended
Jun. 30, 2014
Inventories [Abstract]  
Inventory Amounts by Product Type
Our inventory amounts by product type were as follows at the dates indicated:

 
 
June 30,
2014
 
 
December 31,
2013
 
NGLs
 
$
617.8
 
 
$
593.8
 
Petrochemicals and refined products
 
 
300.8
 
 
 
395.1
 
Crude oil
 
 
368.9
 
 
 
42.6
 
Natural gas
 
 
30.8
 
 
 
61.6
 
Total
 
$
1,318.3
 
 
$
1,093.1
 
Cost of Sales and Lower of Cost or Market Adjustments
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.  The following table presents our total cost of sales amounts and lower of cost or market adjustments for the periods indicated:

 
 
For the Three Months
Ended June 30,
 
 
For the Six Months
Ended June 30,
 
 
 
2014
 
 
2013
 
 
2014
 
 
2013
 
Cost of sales (1)
 
$
10,705.3
 
 
$
9,458.3
 
 
$
21,758.0
 
 
$
19,150.8
 
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.