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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2019
Supplemental Cash Flow Information [Abstract]  
Net Effect of Changes in Operating Assets and Liabilities
The following table presents the net effect of changes in our operating accounts for the periods indicated:

 
  
For the Six Months
Ended June 30,
  
 
  
2019
    
2018
  
Decrease (increase) in:
            
Accounts receivable – trade
  
$
(124.8
)
  
$
18.6
  
Accounts receivable – related parties
    
(10.6
)
    
(0.2
)
Inventories
    
(56.4
)
    
17.6
  
Prepaid and other current assets
    
(291.2
)
    
(82.4
)
Other assets
    
(12.4
)
    
(11.9
)
Increase (decrease) in:
                
Accounts payable – trade
    
60.0
      
112.1
  
Accounts payable – related parties
    
(21.0
)
    
(3.1
)
Accrued product payables
    
107.6
      
30.7
  
Accrued interest
    
(3.3
)
    
14.0
  
Other current liabilities
    
83.0
      
(306.4
)
Other liabilities
    
(62.9
)
    
(17.5
)
Net effect of changes in operating accounts
  
$
(332.0
)
  
$
(228.5
)