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Supplemental Cash Flow Information
 6 Months Ended
Jun. 30, 2021
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information
Note 17.  Supplemental Cash Flow Information

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 Six Months
Ended June 30,
  
 
  
2021
    
2020
  
Decrease (increase) in:
            
Accounts receivable – trade
  
$
(688.9
)
  
$
2,077.0
  
Accounts receivable – related parties
    
(1.8
)
    
(0.1
)
Inventories
    
243.5
      
161.4
  
Prepaid and other current assets
    
200.0
      
906.2
  
Other assets
    
70.4
      
87.7
  
Increase (decrease) in:
                
Accounts payable – trade
    
150.4
      
81.9
  
Accounts payable – related parties
    
(52.6
)
    
(73.1
)
Accrued product payables
    
1,245.8
      
(2,119.4
)
Accrued interest
    
(12.5
)
    
30.0
  
Other current liabilities
    
(726.3
)
    
(1,142.3
)
Other liabilities
    
(28.8
)
    
(98.3
)
Net effect of changes in operating accounts
  
$
399.2
    
$
(89.0
)
                 
Cash payments for interest, net of $40.8 and $62.4 capitalized during the
   six months ended June 30, 2021 and 2020, respectively
  
$
624.0
    
$
577.5
  
                 
Cash payments for federal and state income taxes
  
$
17.1
    
$
0.9
  

We incurred liabilities for construction in progress that had not been paid at June 30, 2021 and December 31, 2020 of $224.5 million and $236.1 million, respectively.  Such amounts are not included under the caption “Capital expenditures” on the Unaudited Condensed Statements of Consolidated Cash Flows.

We recognized non-cash charges totaling $11.3 million for involuntary conversions during the six months ended June 30, 2021 that are a component of net losses attributable to asset sales and related matters.