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Equity-based Awards (Tables)
 12 Months Ended
Dec. 31, 2013
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 the compensation expense we recognized in connection with equity-based awards for the periods indicated:

 
 
For the Year Ended December 31,
 
 
 
2013
  
2012
  
2011
 
Restricted common unit awards
 
$
71.5
  
$
57.0
  
$
47.5
 
Unit option awards
  
0.8
   
1.3
   
3.1
 
Other (1)
  
0.5
   
1.7
   
0.3
 
Total
 
$
72.8
  
$
60.0
  
$
50.9
 
 
(1)
Primarily represents expense associated with unit appreciation rights ("UARs") and similar awards.
 
Restricted Common Unit Awards
The following table presents information regarding restricted common unit awards for the periods indicated:

 
 
  
Weighted-
 
 
 
  
Average Grant
 
 
 
Number of
  
Date Fair Value
 
 
 
Units
  
per Unit (1)
 
Restricted common units at December 31, 2010
  
3,561,614
  
$
29.78
 
Granted (2)
  
1,414,630
  
$
43.66
 
Vested
  
(924,108
)
 
$
31.54
 
Forfeited
  
(183,920
)
 
$
34.27
 
Restricted common units at December 31, 2011
  
3,868,216
  
$
34.22
 
Granted (3)
  
1,588,738
  
$
51.96
 
Vested
  
(1,316,603
)
 
$
34.80
 
Forfeited
  
(246,865
)
 
$
40.43
 
Restricted common units at December 31, 2012
  
3,893,486
  
$
40.87
 
Granted (4)
  
1,774,526
  
$
57.22
 
Vested
  
(1,885,348
)
 
$
34.97
 
Forfeited
  
(172,057
)
 
$
47.63
 
Restricted common units at December 31, 2013
  
3,610,607
  
$
51.66
 
 
(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 2011 was $61.8 million based on a grant date market price of our common units ranging from $40.54 to $44.67 per unit. An estimated annual forfeiture rate of 4.6% was applied to these awards.
(3)
The aggregate grant date fair value of restricted common unit awards issued during 2012 was $82.5 million based on a grant date market price of our common units ranging from $51.92 to $53.54 per unit. An estimated annual forfeiture rate of 3.25% was applied to these awards.
(4)
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 $57.11 to $63.48 per unit. An estimated annual forfeiture rate of 3.9% was applied to these awards.
 
Cash Distributions and Total Intrinsic Value of Restricted Common Units
The following table presents supplemental information regarding our restricted common unit awards for the periods indicated:

 
For the Year Ended December 31,
 
 
2013
 
2012
 
2011
 
Cash distributions paid to restricted common unitholders
 
$
10.6
  
$
10.5
  
$
9.6
 
Total intrinsic value of restricted common unit awards that vested during period
 
$
109.9
  
$
67.0
  
$
39.1
 
Unit Option Activity
The following table presents unit option award activity for the periods indicated:

 
 
 
Weighted-
 
 
 
Weighted-
 
Average
 
 
 
Average
 
Remaining
Aggregate
 
Number of
 
Strike Price
 
Contractual
Intrinsic
 
Units
 
(dollars/unit)
 
Term (in years)
 
Value (1)
Unit option awards at December 31, 2010 and 2011
  
3,753,420
  
$
28.08
 
 
Exercised
  
(742,280
)
 
$
30.77
 
 
Forfeited
  
(250,000
)
 
$
27.45
 
 
Unit option awards at December 31, 2012 (2,3)
  
2,761,140
  
$
27.41
 
 
Exercised
  
(736,140
)
 
$
29.95
 
 
Unit option awards at December 31, 2013 (2,3)
  
2,025,000
  
$
26.49
 
1.3
 
$
57.0
 
(1)
Aggregate intrinsic value reflects fully vested unit option awards at the date indicated.
(2)
At December 31, 2013 and 2012, we were committed to issue 2,025,000 and 2,761,140, respectively, of our common units if all outstanding unit option awards were exercised. Option awards outstanding at December 31, 2013 include 1,330,000 awards that vested during 2013 and became exercisable beginning in February 2014. Of the remaining outstanding option awards at December 31, 2013, 695,000 will vest in 2014 and become exercisable in 2015.
(3)
None of the unit option awards outstanding at December 31, 2013, 2012 and 2011 were exercisable.
 
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,
 
 
2013
 
2012
 
2011
 
Total intrinsic value of unit option awards exercised during period
 
$
19.8
  
$
14.6
  
$
--
 
Cash received from EPCO in connection with the exercise of unit option awards
 
$
11.5
  
$
10.2
  
$
--
 
Unit option award-related cash reimbursements to EPCO
 
$
19.8
  
$
14.0
  
$
--