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Supplemental Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 2021
Supplemental Cash Flow Information [Abstract]  
Net Effect of Changes in Operating Assets and Liabilities
The following table provides information regarding the net effect of changes in our operating accounts and cash payments for interest and income taxes for the periods indicated:

 
  
For the Three Months
Ended March 31,
  
 
  
2021
    
2020
  
Decrease (increase) in:
            
Accounts receivable – trade
  
$
(1,214.7
)
  
$
1,702.4
  
Accounts receivable – related parties
    
(1.6
)
    
0.5
  
Inventories
    
(95.7
)
    
507.7
  
Prepaid and other current assets
    
158.4
      
1,001.7
  
Other assets
    
2.3
      
22.7
  
Increase (decrease) in:
                
Accounts payable – trade
    
83.5
      
22.4
  
Accounts payable – related parties
    
(64.4
)
    
(93.0
)
Accrued product payables
    
1,591.7
      
(1,743.1
)
Accrued interest
    
(231.4
)
    
(193.4
)
Other current liabilities
    
(160.2
)
    
(896.4
)
Other liabilities
    
31.1
      
10.2
  
Net effect of changes in operating accounts
  
$
99.0
    
$
341.7
  
                 
Cash payments for interest, net of $19.6 and $30.5 capitalized during the
   three months ended March 31, 2021 and 2020, respectively
  
$
541.1
    
$
496.3
  
                 
Cash payments (refunds) for federal and state income taxes
  
$
(4.5
)
  
$
0.4