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Inventories (Tables)
 12 Months Ended
Dec. 31, 2019
Inventories [Abstract]  
Inventory Amounts by Product Type Our inventory amounts by product type were as follows at the dates indicated:

 
  
December 31,
  
 
  
2019
    
2018
  
NGLs
  
$
1,094.9
    
$
647.7
  
Petrochemicals and refined products
    
311.5
      
264.7
  
Crude oil
    
674.2
      
593.4
  
Natural gas
    
10.8
      
16.3
  
Total
  
$
2,091.4
    
$
1,522.1
  
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 net realizable value adjustments for the years indicated:

 
For the Year Ended December 31,
  
 
2019
  
2018
  
2017
  
Cost of sales (1)
  
$
22,065.8
    
$
26,789.8
    
$
21,487.0
  
Lower of cost or net realizable value adjustments recognized in cost of sales
    
22.7
      
11.5
      
9.1
  

(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.