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Equity-Based Awards (Tables)
 12 Months Ended
Dec. 31, 2018
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 years indicated:

 
 
For the Year Ended December 31,
 
 
 
2018
  
2017
  
2016
 
Equity-classified awards:
         
Phantom unit awards
 
$
99.7
  
$
92.8
  
$
78.6
 
Restricted common unit awards
  
--
   
0.5
   
4.7
 
Profits interest awards
  
6.1
   
6.0
   
5.4
 
Liability-classified awards
  
0.3
   
0.4
   
0.5
 
Total
 
$
106.1
  
$
99.7
  
$
89.2
 
Other Share-based Compensation Plans
The following table presents phantom unit award activity for the years indicated:

 
 
Number of
Units
  
Weighted-
Average Grant
Date Fair Value
per Unit (1)
 
Phantom unit awards at January 1, 2016
  
5,426,949
  
$
33.63
 
Granted (2)
  
4,508,310
  
$
21.90
 
Vested
  
(1,761,455
)
 
$
33.10
 
Forfeited
  
(406,303
)
 
$
28.52
 
Phantom unit awards at December 31, 2016
  
7,767,501
  
$
27.20
 
Granted (3)
  
4,268,920
  
$
28.83
 
Vested
  
(2,490,081
)
 
$
28.30
 
Forfeited
  
(256,839
)
 
$
27.60
 
Phantom unit awards at December 31, 2017
  
9,289,501
  
$
27.65
 
Granted (4)
  
5,006,181
  
$
26.82
 
Vested
  
(3,479,958
)
 
$
28.57
 
Forfeited
  
(482,447
)
 
$
26.88
 
Phantom unit awards at December 31, 2018
  
10,333,277
  
$
26.97
 
  
(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 2016 was $98.7 million based on a grant date market price of our common units ranging from $21.86 to $27.39 per unit. An estimated annual forfeiture rate of 3.9% was applied to these awards.
(3)     The aggregate grant date fair value of phantom unit awards issued during 2017 was $123.1 million based on a grant date market price of our common units ranging from $24.55 to $28.87 per unit. An estimated annual forfeiture rate of 3.8% was applied to these awards.
(4)     The aggregate grant date fair value of phantom unit awards issued during 2018 was $134.3 million based on a grant date market price of our common units ranging from $25.40 to $29.22 per unit. An estimated annual forfeiture rate of 3.2% was applied to these awards.
 


The following table summarizes key elements of each Employee Partnership as of December 31, 2018:

 
 
 
Employee
Partnership
 
Enterprise
Common Units
Contributed to
Employee Partnership
by EPCO Holdings
 
Class A
Capital
     Base (1)
 
Class A
Preference
Return (2)
 
Expected
Vesting/
Liquidation
Date
Estimated
Grant Date
Fair Value of
Profits Interest
  Awards (3)
Unrecognized
Compensation
  Cost (4)
                 
PubCo I
  
2,723,052
 
$63.7 million
 
$
0.3900
 
Feb. 2020
$13.0 million
$4.3 million
PubCo II
  
2,834,198
 
$66.3 million
 
$
0.3900
 
Feb. 2021
$14.9 million
$7.3 million
PubCo III
  
105,000
 
$2.5 million
 
$
0.3900
 
Apr. 2020
$0.5 million
$0.2 million
PrivCo I
  
1,111,438
 
$26.0 million
 
$
0.3900
 
Feb. 2021
$5.8 million
$0.5 million
EPD IV
  
6,400,000
 
$172.9 million
 
$
0.4325
 
Dec. 2023
$26.7 million
$23.1 million
EPCO II
  
1,600,000
 
$43.2 million
 
$
0.4325
 
Dec. 2023
$6.7 million
$0.5 million
 
(1)Represents fair market value of the Enterprise common units contributed to each Employee Partnership at the applicable contribution date.
(2)Each quarter, the Class A limited partner in each Employee Partnership is paid a cash distribution equal to the product of (i) the number of common units owned by the Employee Partnership and (ii) the Class A Preference Return (subject to equitable adjustment in order to reflect any equity split, equity distribution or dividend, reverse split, combination, reclassification, recapitalization or other similar event affecting such common units). To the extent that the Employee Partnership has cash remaining after making this quarterly payment to the Class A limited partner, the residual cash is distributed to the Class B limited partners on a quarterly basis.
(3)Represents the total grant date fair value of the profits interest awards irrespective of how such costs will be allocated between us and EPCO and its privately held affiliates.
(4)Represents our expected share of the unrecognized compensation cost at December 31, 2018. We expect to recognize our share of the unrecognized compensation cost for PubCo I, PubCo II, PubCo III, PrivCo I, EPD IV and EPCO II over a weighted-average period of 1.1 years, 2.1 years, 1.3 years, 2.1 years, 4.9 years and 4.9 years, respectively.


The following table summarizes the assumptions we used in applying a Black-Scholes option pricing model to derive that portion of the estimated grant date fair value of the profits interest awards for each Employee Partnership:

 
Expected
Risk-Free
Expected
Expected Unit
Employee
Life
Interest
Distribution
Price
Partnership
of Award
Rate
Yield
Volatility
PubCo I
4.0 years
0.9% to 2.7%
5.9% to 7.0%
19% to 40%
PubCo II
5.0 years
1.1% to 3.0%
5.9% to 7.0%
19% to 40%
PubCo III
4.0 years
1.0% to 2.2%
6.1% to 6.8%
27% to 40%
PrivCo I
5.0 years
1.2% to 1.6%
6.1% to 6.7%
28% to 40%
EPD IV
5.0 years
2.8%
6.5%
27%
EPCO II
5.0 years
2.8%
6.5%
27%
Supplemental Information Regarding Phantom Unit Awards

The following table presents supplemental information regarding phantom unit awards for the years indicated:
 
 
 
For the Year Ended December 31,
 
 
 
2018
  
2017
  
2016
 
Cash payments made in connection with DERs
 
$
17.7
  
$
15.1
  
$
11.7
 
Total intrinsic value of phantom unit awards that vested during period
 
$
90.7
  
$
69.8
  
$
40.9
 
 
Restricted Common Unit Awards
The following table presents restricted common unit award activity for the years indicated:

 
 
Number of
Units
  
Weighted-
Average Grant
Date Fair Value
per Unit (1)
 
Restricted common units at January 1, 2016
  
1,960,520
  
$
27.88
 
Vested
  
(1,234,502
)
 
$
27.45
 
Forfeited
  
(43,724
)
 
$
28.48
 
Restricted common units at December 31, 2016
  
682,294
  
$
28.61
 
Vested
  
(681,044
)
 
$
28.60
 
Forfeited
  
(1,250
)
 
$
31.07
 
Restricted common units at December 31, 2017
  
--
  
$
N/A
 
         
(1)Determined by dividing the aggregate grant date fair value of awards (before an allowance for forfeitures) by the number of awards issued.
 
Supplemental Information Regarding Restricted Common Unit Awards
The following table presents supplemental information regarding restricted common unit awards for the years indicated:

 
 
For the Year Ended December 31,
 
 
 
2017
  
2016
 
Cash distributions paid to restricted common unitholders
 
$
0.3
  
$
1.6
 
Total intrinsic value of restricted common unit awards that vested during period
 
$
18.9
  
$
28.5