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Employee Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Amounts Recognized in Consolidated Financial Statements
Amounts recognized on the consolidated financial statements with respect to these plans are as follows (in millions):

 
Three Months Ended June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Cost of unit-based compensation charged to operating expense
$
2.3

 
$
2.6

 
$
4.3

 
$
7.6

Cost of unit-based compensation charged to general and administrative expense
7.3

 
6.7

 
10.4

 
21.1

Total unit-based compensation expense
$
9.6

 
$
9.3

 
$
14.7

 
$
28.7

Non-controlling interest in unit-based compensation
$
3.6

 
$
3.5

 
$
5.5

 
$
10.8

Amount of related income tax benefit recognized in net income (1)
$
1.2

 
$
2.1

 
$
1.9

 
$
6.7


                                                          
(1)
For the three and six months ended June 30, 2018, the amount of related income tax benefit recognized in net income excluded $0.1 million of income tax benefit and $1.5 million of income tax expense, respectively, related to tax deficiencies recorded upon vesting of restricted units. For the six months ended June 30, 2017, the amount of related income tax benefit recognized in net income excluded $2.3 million of income tax expense related to tax deficiencies recorded upon vesting of restricted units. There was no income tax expense or benefit related to tax deficiencies recorded upon vesting of restricted units for the three months ended June 30, 2017.
Summary of Restricted Incentive Unit Activity
A summary of the restricted incentive unit activity for the six months ended June 30, 2018 is provided below:
 
 
Six Months Ended
June 30, 2018
EnLink Midstream Partners, LP Restricted Incentive Units:
 
Number of Units
 
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period
 
1,980,224

 
$
15.81

Granted (1)
 
1,166,464

 
15.15

Vested (1)(2)
 
(601,581
)
 
22.04

Forfeited
 
(148,572
)
 
12.29

Non-vested, end of period
 
2,396,535

 
$
14.14

Aggregate intrinsic value, end of period (in millions)
 
$
37.2

 
 
                                                           
(1)
Restricted incentive units typically vest at the end of three years. In March 2018, ENLK granted 200,753 restricted incentive units with a fair value of $3.0 million to officers and certain employees as bonus payments for 2017, and these restricted incentive units vested immediately and are included in the restricted incentive units granted and vested line items.
(2)
Vested units included 189,584 units withheld for payroll taxes paid on behalf of employees.
A summary of the restricted incentive unit activity for the six months ended June 30, 2018 is provided below:
 
 
Six Months Ended
June 30, 2018
EnLink Midstream, LLC Restricted Incentive Units:
 
Number of Units
 
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period
 
1,889,310

 
$
16.33

Granted (1)
 
1,059,062

 
15.67

Vested (1)(2)
 
(556,262
)
 
24.24

Forfeited
 
(138,187
)
 
12.24

Non-vested, end of period
 
2,253,923

 
$
14.32

Aggregate intrinsic value, end of period (in millions)
 
$
37.1

 
 
                                                           
(1)
Restricted incentive units typically vest at the end of three years. In March 2018, ENLC granted 194,185 restricted incentive units with a fair value of $3.0 million to officers and certain employees as bonus payments for 2017, and these restricted incentive units vested immediately and are included in the restricted incentive units granted and vested line items.
(2)
Vested units included 178,824 units withheld for payroll taxes paid on behalf of employees.
Summary of Restricted Units' Aggregate Intrinsic Value
A summary of the restricted incentive units’ aggregate intrinsic value (market value at vesting date) and fair value of units vested (market value at date of grant) for the three and six months ended June 30, 2018 and 2017 is provided below (in millions):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
EnLink Midstream, LLC Restricted Incentive Units:
 
2018
 
2017
 
2018
 
2017
Aggregate intrinsic value of units vested
 
$
0.4

 
$
0.3

 
$
9.3

 
$
14.6

Fair value of units vested
 
$
0.4

 
$
0.4

 
$
13.5

 
$
20.8

A summary of the restricted incentive units’ aggregate intrinsic value (market value at vesting date) and fair value of units vested (market value at date of grant) for the three and six months ended June 30, 2018 and 2017 is provided below (in millions):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
EnLink Midstream Partners, LP Restricted Incentive Units:
 
2018
 
2017
 
2018
 
2017
Aggregate intrinsic value of units vested
 
$
0.4

 
$
0.4

 
$
9.1

 
$
15.7

Fair value of units vested
 
$
0.5

 
$
0.5

 
$
13.3

 
$
21.0
Summary of Grant-Date Fair Values
The following table presents a summary of the grant-date fair value assumptions by performance unit grant date:

EnLink Midstream, LLC Performance Units:
 
March 2018
Beginning TSR price
 
$
16.55

Risk-free interest rate
 
2.38
%
Volatility factor
 
51.36
%
Distribution yield
 
6.7
%

The following table presents a summary of the grant-date fair value of performance units granted and the related assumptions by performance unit grant date:

EnLink Midstream Partners, LP Performance Units:
 
March 2018
Beginning TSR price
 
$
15.44

Risk-free interest rate
 
2.38
%
Volatility factor
 
43.85
%
Distribution yield
 
10.5
%
Summary of Performance Units
The following table presents a summary of the performance units:
 
 
Six Months Ended
June 30, 2018
EnLink Midstream Partners, LP Performance Units:
 
Number of Units
 
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period
 
585,285

 
$
20.52

Granted
 
256,345

 
19.24

Vested (1)
 
(115,328
)
 
35.39

Forfeited
 
(76,351
)
 
16.62

Non-vested, end of period
 
649,951

 
$
17.83

Aggregate intrinsic value, end of period (in millions)
 
$
10.1

 
 

                                                           
(1)
Vested units included 34,069 units withheld for payroll taxes paid on behalf of employees.

A summary of the performance units’ aggregate intrinsic value (market value at vesting date) and fair value of units vested (market value at date of grant) for the six months ended June 30, 2018 is provided below (in millions). No performance units vested for the three months ended June 30, 2018 or for the three and six months ended June 30, 2017.
EnLink Midstream Partners, LP Performance Units:
 
Six Months Ended June 30, 2018
Aggregate intrinsic value of units vested
 
$
2.0

Fair value of units vested
 
$
4.1

The following table presents a summary of the performance units:
 
 
Six Months Ended
June 30, 2018
EnLink Midstream, LLC Performance Units:
 
Number of Units
 
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period
 
548,839

 
$
22.14

Granted
 
223,865

 
21.63

Vested (1)
 
(102,555
)
 
40.48

Forfeited
 
(70,918
)
 
17.75

Non-vested, end of period
 
599,231

 
$
19.33

Aggregate intrinsic value, end of period (in millions)
 
$
9.9

 
 

                                                           
(1)
Vested units included 28,846 units withheld for payroll taxes paid on behalf of employees.

A summary of the performance units’ aggregate intrinsic value (market value at vesting date) and fair value of units vested (market value at date of grant) for the six months ended June 30, 2018 is provided below (in millions). No performance units vested for the three months ended June 30, 2018 or for the three and six months ended June 30, 2017.
EnLink Midstream, LLC Performance Units:
 
Six Months Ended June 30, 2018
Aggregate intrinsic value of units vested
 
$
1.9

Fair value of units vested
 
$
4.2