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Inventories (Tables)
 6 Months Ended
Jun. 30, 2013
Inventories [Abstract]  
Inventory Amounts by Product Type
Our available-for-sale inventory amounts by product type were as follows at the dates indicated:

 
 
June 30,
2013
 
 
December 31,
2012
 
NGLs
 
$
799.1
 
 
$
594.3
 
Petrochemicals and refined products
 
 
394.0
 
 
 
304.5
 
Crude oil
 
 
156.9
 
 
 
119.4
 
Natural gas
 
 
61.4
 
 
 
70.2
 
Total
 
$
1,411.4
 
 
$
1,088.4
 
Cost of Sales and Lower of Cost or Market Adjustments
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,
 
 
 
2013
 
 
2012
 
 
2013
 
 
2012
 
Cost of sales (1)
 
$
9,458.3
 
 
$
8,195.2
 
 
$
19,150.8
 
 
$
17,861.0
 
Lower of cost or market adjustments
 
 
7.7
 
 
 
8.0
 
 
 
10.4
 
 
 
13.9
 
(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.