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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]  
Allowance for Doubtful Accounts Activity
The following table presents our allowance for doubtful accounts activity for the periods indicated:

 
 
For the Year Ended December 31,
 
 
 
2014
  
2013
  
2012
 
Balance at beginning of period
 
$
7.5
  
$
13.2
  
$
13.4
 
Charged to costs and expenses
  
8.4
   
2.1
   
0.3
 
Deductions (1)
  
(2.0
)
  
(7.8
)
  
(0.5
)
Balance at end of period
 
$
13.9
  
$
7.5
  
$
13.2
 
             
(1)    The 2013 deduction is primarily due to the write-off of certain amounts attributable to companies in bankruptcy and amounts we believe are no longer collectible.
 
 
Environmental Reserves Activity
The following table presents the activity of our environmental reserves for the periods indicated:

 
 
For the Year Ended December 31,
 
 
 
2014
  
2013
  
2012
 
Balance at beginning of period
 
$
9.9
  
$
13.7
  
$
12.3
 
Charged to costs and expenses
  
11.9
   
3.9
   
13.9
 
Acquisition-related additions and other
  
2.5
   
0.7
   
5.2
 
Deductions
  
(8.7
)
  
(8.4
)
  
(17.7
)
Balance at end of period
 
$
15.6
  
$
9.9
  
$
13.7
 
Components of Other net
The following table presents the components of "Other, net" as presented on our Statements of Consolidated Operations for the periods indicated:

 
 
For the Year Ended December 31,
 
 
 
2014
  
2013
  
2012
 
Gain on sales of available-for-sale securities of  Energy Transfer Equity (1)
 
$
--
  
$
--
  
$
68.8
 
Other
  
0.6
   
(1.1
)
  
3.8
 
Total
 
$
0.6
  
$
(1.1
)
 
$
72.6
 
   
(1)    See Note 9 for information regarding the liquidation of our investment in limited partnership units of Energy Transfer Equity.