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Equity-Based Awards (Tables) | 12 Months Ended
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Dec. 31, 2017
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, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Equity-classified awards: |  |  |  |  |  |  |  |  |
Phantom unit awards |  | $ | 92.8 |  |  | $ | 78.6 |  |  | $ | 78.3 |
Restricted common unit awards |  |  | 0.5 |  |  |  | 4.7 |  |  |  | 14.7 |
Profits interest awards |  |  | 6.0 |  |  |  | 5.4 |  |  |  | -- |
Liability-classified awards |  |  | 0.4 |  |  |  | 0.5 |  |  |  | 0.2 |
Total |  | $ | 99.7 |  |  | $ | 89.2 |  |  | $ | 93.2 |
Other Share-based Compensation Plans | 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 January 1, 2015 |  |  | 3,342,390 |  |  | $ | 33.13 |
Granted (2) |  |  | 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 |
Granted (3) |  |  | 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 (4) |  |  | 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 |
(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 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 percent was applied to these awards. (3) 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 percent was applied to these awards. (4) 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 percent was applied to these awards. |
The following table summarizes key elements of each Employee Partnership as of December 31, 2017:
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 |  | $ | 0.39 |  | Feb. 2020 | $13.2 million | $7.4 million
PubCo II |  |  | 2,834,198 |  | $66.3 million |  | $ | 0.39 |  | Feb. 2021 | $14.7 million | $9.3 million
PubCo III |  |  | 105,000 |  | $2.5 million |  | $ | 0.39 |  | Apr. 2020 | $0.6 million | $0.2 million
PrivCo I |  |  | 1,111,438 |  | $26.0 million |  | $ | 0.39 |  | Feb. 2021 | $5.8 million | $0.8 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 of $0.39 per unit (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, 2017. We expect to recognize our share of the unrecognized compensation cost for PubCo I, PubCo II, PubCo III and PrivCo I over a weighted-average period of 2.1 years, 3.1 years, 2.3 years and 3.1 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 1.6% | 6.2% to 7.0% | 29% to 40%
PubCo II | 5.0 years | 1.1% to 1.8% | 6.1% to 7.0% | 27% to 40%
PubCo III | 4.0 years | 1.0% to 1.4% | 6.1% to 6.2% | 31% to 40%
PrivCo I | 5.0 years | 1.2% to 1.6% | 6.1% to 6.7% | 28% to 40%
Supplemental Information Regarding Phantom Unit Awards | The following table presents supplemental information regarding phantom unit awards for the periods indicated:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Cash payments made in connection with DERs |  | $ | 15.1 |  |  | $ | 11.7 |  |  | $ | 7.7 |
Total intrinsic value of phantom unit awards that vested during period |  | $ | 69.8 |  |  | $ | 40.9 |  |  | $ | 31.2 |
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 January 1, 2015 |  |  | 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 |
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 periods indicated:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Cash distributions paid to restricted common unitholders |  | $ | 0.3 |  |  | $ | 1.6 |  |  | $ | 4.0 |
Total intrinsic value of restricted common unit awards that vested during period |  | $ | 18.9 |  |  | $ | 28.5 |  |  | $ | 67.3 |
Unit Option Activity | The following table presents unit option award activity for the period indicated:
|  | Number of Units |  |  | Weighted- Average Strike Price (dollars/unit) |
Unit option awards at January 1, 2015 |  |  | 1,270,000 |  |  | $ | 16.14 |
Exercised |  |  | (1,270,000 | ) |  | $ | 16.14 |
Unit option awards at December 31, 2015 |  |  | -- |  |  | $ | -- |
The following table presents supplemental information regarding unit option awards during the year ended December 31, 2015:
Total intrinsic value of unit option awards exercised during period |  | $ | 21.7 |
Cash received from EPCO in connection with the exercise of unit option awards |  | $ | 13.1 |
Unit option award-related cash reimbursements to EPCO |  | $ | 21.7 |

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