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Equity-Based Awards (Tables)
 12 Months Ended
Dec. 31, 2015
Equity-based Awards [Abstract]  
Equity-based Award Expense
An allocated portion of the fair value of EPCO's equity-based awards is charged to us under the ASA.  The following table summarizes compensation expense we recognized in connection with equity-based awards for the periods indicated:

 
 
For the Year Ended December 31,
 
 
 
2015
  
2014
  
2013
 
Equity-classified awards:
      
Restricted common unit awards
 
$
14.7
  
$
42.1
  
$
71.5
 
Phantom unit awards
  
78.3
   
45.1
   
--
 
Unit option awards
  
--
   
--
   
0.8
 
Liability-classified awards
  
0.2
   
0.3
   
0.5
 
Total
 
$
93.2
  
$
87.5
  
$
72.8
 
Phantom Unit Awards
The following table presents phantom unit award activity for the periods indicated:

 
 
Number of
Units
  
Weighted-
Average Grant
Date Fair Value
per Unit (1)
 
Phantom unit awards at December 31, 2013
  
--
  
$
--
 
Granted (2)
  
3,530,710
  
$
33.12
 
Vested
  
(38,200
)
 
$
33.04
 
Forfeited
  
(150,120
)
 
$
33.12
 
Phantom unit awards at December 31, 2014
  
3,342,390
  
$
33.13
 
Granted (3)
  
3,496,140
  
$
33.96
 
Vested
  
(940,415
)
 
$
33.14
 
Forfeited
  
(471,166
)
 
$
33.51
 
Phantom unit awards at December 31, 2015
  
5,426,949
  
$
33.63
 
 
(1)    Determined by dividing the aggregate grant date fair value of awards (before an allowance for forfeitures) by the number of awards issued.
(2)   The aggregate grant date fair value of phantom unit awards issued during 2014 was $117.0 million based on a grant date market price of our common units ranging from $33.04 to $37.59 per unit. An estimated annual forfeiture rate of 3.4% was applied to these awards.
(3)    The aggregate grant date fair value of phantom unit awards issued during 2015 was $118.7 million based on a grant date market price of our common units ranging from $27.31 to $34.40 per unit. An estimated annual forfeiture rate of 3.5% was applied to these awards.
 
Supplemental Information Regarding Phantom Unit Awards
The following table presents supplemental information regarding our phantom unit awards and DERs for the periods indicated:
 
 
 
For the Year Ended December 31,
 
 
 
2015
  
2014
  
2013
 
Cash payments made in connection with DERs
 
$
7.7
  
$
3.7
  
$
--
 
Total intrinsic value of phantom unit awards that vested during period
 
$
31.2
  
$
1.4
  
$
--
 
 
Restricted Common Unit Awards
The following table presents restricted common unit award activity for the periods indicated:

 
 
Number of
Units
  
Weighted-
Average Grant
Date Fair Value
per Unit (1)
 
Restricted common units at December 31, 2012
  
7,786,972
  
$
20.43
 
Granted (2)
  
3,549,052
  
$
28.61
 
Vested
  
(3,770,696
)
 
$
17.48
 
Forfeited
  
(344,114
)
 
$
23.82
 
Restricted common units at December 31, 2013
  
7,221,214
  
$
25.83
 
Vested
  
(2,634,074
)
 
$
23.94
 
Forfeited
  
(357,350
)
 
$
26.38
 
Restricted common units at December 31, 2014
  
4,229,790
  
$
26.96
 
Vested
  
(2,009,970
)
 
$
26.00
 
Forfeited
  
(259,300
)
 
$
27.53
 
Restricted common units at December 31, 2015
  
1,960,520
  
$
27.88
 
         
(1)   Determined by dividing the aggregate grant date fair value of awards (before an allowance for forfeitures) by the number of awards issued.
(2)   The aggregate grant date fair value of restricted common unit awards issued during 2013 was $101.5 million based on a grant date market price of our common units ranging from $28.56 to $31.74 per unit. An estimated annual forfeiture rate of 3.9% was applied to these awards.
 
Supplemental Information Regarding Restricted Common Unit Awards
The following table presents supplemental information regarding our restricted common unit awards for the periods indicated:

 
 
For the Year Ended December 31,
 
 
 
2015
  
2014
  
2013
 
Cash distributions paid to restricted common unitholders
 
$
4.0
  
$
7.3
  
$
10.6
 
Total intrinsic value of restricted common unit awards that vested during period
 
$
67.3
  
$
87.1
  
$
109.9
 
Unit Option Activity

The following table presents unit option award activity for the periods indicated:

 
 
Number of
Units
  
Weighted-
Average
Strike Price
(dollars/unit)
 
Unit option awards at December 31, 2012
  
5,522,280
  
$
13.71
 
Exercised
  
(1,472,280
)
 
$
14.98
 
Unit option awards at December 31, 2013
  
4,050,000
  
$
13.24
 
Exercised
  
(2,720,000
)
 
$
11.83
 
Forfeited
  
(60,000
)
 
$
16.14
 
Unit option awards at December 31, 2014 (1)
  
1,270,000
  
$
16.14
 
Exercised
  
(1,270,000
)
 
$
16.14
 
Unit option awards at December 31, 2015
  
--
  
$
--
 
         
(1)   All of the unit option awards outstanding at December 31, 2014 vested during 2014 and were exercised during 2015.
 
Supplemental Information Regarding Unit Options
The following table presents supplemental information regarding our unit option awards during the periods indicated:

 
 
For the Year Ended December 31,
 
 
 
2015
  
2014
  
2013
 
Total intrinsic value of unit option awards exercised during period
 
$
21.7
  
$
57.5
  
$
19.8
 
Cash received from EPCO in connection with the exercise of unit option awards
 
$
13.1
  
$
33.4
  
$
11.5
 
Unit option award-related cash reimbursements to EPCO
 
$
21.7
  
$
57.5
  
$
19.8