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Employee Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 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):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Cost of unit-based compensation charged to general and administrative expense
 
$
30.3

 
$
37.4

 
$
23.7

Cost of unit-based compensation charged to operating expense
 
10.8

 
10.7

 
6.6

Total unit-based compensation expense
 
$
41.1

 
$
48.1

 
$
30.3

Non-controlling interest in unit-based compensation
 
$
15.7

 
$
18.0

 
$
11.3

Amount of related income tax benefit recognized in net income (1)
 
$
5.3

 
$
11.3

 
$
7.1

____________________________
(1)
For the years ended December 31, 2018 and 2017, the amount of related income tax benefit recognized in net income excluded $0.7 million and $2.9 million, respectively, of income tax expense related to tax deficiencies recorded on vested units.
Summary of Restricted Incentive Unit Activity
ENLK restricted incentive units are valued at their fair value at the date of grant, which is equal to the market value of ENLK common units on such date. A summary of the restricted incentive unit activity for the year ended December 31, 2018 is provided below:
 
 
Year Ended December 31, 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)
 
1,590,100

 
15.27

Vested (1)(2)
 
(835,115
)
 
19.68

Forfeited
 
(178,939
)
 
12.75

Non-vested, end of period
 
2,556,270

 
$
14.43

Aggregate intrinsic value, end of period (in millions)
 
$
28.1

 
 
____________________________
(1)
Restricted incentive units typically vest at the end of three years. In March 2018, the General Partner 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 include 261,063 units withheld for payroll taxes paid on behalf of employees.
ENLC restricted incentive units are valued at their fair value at the date of grant, which is equal to the market value of ENLC common units on such date. A summary of the restricted incentive unit activity for the year ended December 31, 2018 is provided below:
 
 
Year Ended December 31, 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)
 
1,473,195

 
15.76

Vested (1)(2)
 
(769,848
)
 
21.40

Forfeited
 
(166,790
)
 
12.74

Non-vested, end of period
 
2,425,867

 
$
14.62

Aggregate intrinsic value, end of period (in millions)
 
$
23.0

 
 
____________________________
(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 include 244,123 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 years ended December 31, 2018, 2017, and 2016 is provided below (in millions):
 
 
Year Ended December 31,
EnLink Midstream Partners, LP Restricted Incentive Units:
 
2018
 
2017
 
2016
Aggregate intrinsic value of units vested
 
$
13.1

 
$
16.6

 
$
4.1

Fair value of units vested
 
$
16.4

 
$
22.6

 
$
9.5

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) during the years ended December 31, 2018, 2017, and 2016 is provided below (in millions):
 
 
Year Ended December 31,
EnLink Midstream, LLC Restricted Incentive Units:
 
2018
 
2017
 
2016
Aggregate intrinsic value of units vested
 
$
12.8

 
$
15.3

 
$
4.1

Fair value of units vested
 
$
16.5

 
$
22.2

 
$
12.4
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
 
March 2017
 
October 2016
 
February 2016
 
January 2016
TSR price
 
$
16.55

 
$
18.29

 
$
16.75

 
$
15.38

 
$
15.38

Risk-free interest rate
 
2.38
%
 
1.62
%
 
0.91
%
 
0.89
%
 
1.10
%
Volatility factor
 
51.36
%
 
52.07
%
 
52.89
%
 
52.05
%
 
46.02
%
Distribution yield
 
6.70
%
 
5.40
%
 
6.10
%
 
14.00
%
 
8.60
%
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
 
March 2017
 
October 2016
 
February 2016
 
January 2016
TSR price
 
$15.44
 
$17.55
 
$17.71
 
$14.82
 
$14.82
Risk-free interest rate
 
2.38
%
 
1.62
%
 
0.91
%
 
0.89
%
 
1.10
%
Volatility factor
 
43.85
%
 
43.94
%
 
44.62
%
 
42.33
%
 
39.71
%
Distribution yield
 
10.50
%
 
8.70
%
 
8.80
%
 
19.20
%
 
12.10
%
Summary of Performance Units
The following table presents a summary of the performance units:
 
 
Year Ended December 31, 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)
 
(283,637
)
 
27.25

Forfeited
 
(70,918
)
 
17.75

Non-vested, end of period
 
418,149

 
$
19.15

Aggregate intrinsic value, end of period (in millions)
 
$
4.0

 
 
____________________________
(1)
Vested units included 100,109 units withheld for payroll taxes paid on behalf of employees and 109,819 units that vested as a result of the GIP Transaction, net of units withheld for payroll taxes.

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 year ended December 31, 2018 is provided below (in millions). No performance units vested for the years ended 2017 and 2016.
EnLink Midstream, LLC Performance Units:
 
Year Ended December 31, 2018
Aggregate intrinsic value of units vested
 
$
4.7

Fair value of units vested
 
$
7.7

The following table presents a summary of the performance units:
 
 
Year Ended December 31, 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)
 
(313,610
)
 
24.43

Forfeited
 
(76,351
)
 
16.62

Non-vested, end of period
 
451,669

 
$
17.74

Aggregate intrinsic value, end of period (in millions)
 
$
5.0

 
 
____________________________
(1)
Vested units included 112,101 units withheld for payroll taxes paid on behalf of employees and 120,250 units that vested as a result of the GIP Transaction, net of units withheld for payroll taxes.

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 year ended December 31, 2018 is provided below (in millions). No performance units vested for the years ended 2017 and 2016.
EnLink Midstream Partners, LP Performance Units:
 
Year Ended December 31, 2018
Aggregate intrinsic value of units vested
 
$
5.0

Fair value of units vested
 
$
7.7