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Supplemental Cash Flow Information
 6 Months Ended
Jun. 30, 2016
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information

Note 15.  Supplemental Cash Flow Information

The following table presents the net effect of changes in our operating accounts for the periods indicated:

 
 
For the Six Months
Ended June 30,
 
 
 
2016
  
2015
 
Decrease (increase) in:
      
Accounts receivable – trade
 
$
(481.8
)
 
$
460.9
 
Accounts receivable – related parties
  
(0.6
)
  
0.6
 
Inventories
  
(618.7
)
  
(46.6
)
Prepaid and other current assets
  
(51.3
)
  
(50.5
)
Other assets
  
0.5
   
3.6
 
Increase (decrease) in:
        
Accounts payable – trade
  
(7.0
)
  
3.4
 
Accounts payable – related parties
  
(5.3
)
  
(3.4
)
Accrued product payables
  
790.3
   
(559.4
)
Accrued interest
  
(1.2
)
  
14.5
 
Other current liabilities
  
74.6
   
(83.0
)
Other liabilities
  
5.9
   
9.2
 
Net effect of changes in operating accounts
 
$
(294.6
)
 
$
(250.7
)

We incurred liabilities for construction in progress that had not been paid at June 30, 2016 and December 31, 2015 of $236.9 million and $472.8 million, respectively.  Such amounts are not included under the caption "Capital expenditures" on the Unaudited Condensed Statements of Consolidated Cash Flows.

On certain of our capital projects, third parties are obligated to reimburse us for all or a portion of project expenditures.  The majority of such arrangements are associated with projects related to pipeline construction activities and production well tie-ins.  These cash receipts are presented as "Contributions in aid of construction costs" within the investing activities section of our Unaudited Condensed Statements of Consolidated Cash Flows.