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Inventories (Tables)
 12 Months Ended
Dec. 31, 2013
Inventories [Abstract]  
Inventory Amounts by Product Type
Our inventory amounts by product type were as follows at the dates indicated:

 
 
December 31,
 
 
 
2013
  
2012
 
NGLs
 
$
593.8
  
$
594.3
 
Petrochemicals and refined products
  
395.1
   
304.5
 
Crude oil
  
42.6
   
119.4
 
Natural gas
  
61.6
   
70.2
 
Total
 
$
1,093.1
  
$
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 Year Ended December 31,
 
 
2013
 
2012
 
2011
 
Cost of sales (1)
 
$
40,770.2
  
$
36,015.5
  
$
38,292.6
 
Lower of cost or market adjustments
 
$
18.5
  
$
22.1
  
$
9.5
 
(1)
Cost of sales is a component of "Operating costs and expenses," as presented on our Statements of Consolidated Operations. Year-to-year fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.