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Employee Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [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,
202120202019
Cost of unit-based compensation charged to general and administrative expense$18.7 $21.3 $32.7 
Cost of unit-based compensation charged to operating expense6.6 7.1 6.7 
Total unit-based compensation expense$25.3 $28.4 $39.4 
Non-controlling interest in unit-based compensation$— $— $0.5 
Amount of related income tax benefit recognized in net income (loss) (1)$5.9 $6.7 $9.1 
____________________________
(1)For the years ended December 31, 2021, 2020, and 2019 the amount of related income tax benefit recognized in net income (loss) excluded $3.1 million, $6.0 million, and $2.2 million of income tax expense, respectively, related to book-to-tax differences recorded upon vesting of restricted units.
Summary of Restricted Incentive Unit Activity A summary of the restricted incentive unit activity for the year ended December 31, 2021 is provided below:
Year Ended December 31, 2021
ENLC Restricted Incentive Units:Number of UnitsWeighted Average Grant-Date Fair Value
Non-vested, beginning of period5,350,086 $8.45 
Granted (1)3,937,301 3.86 
Vested (1)(2)(1,268,801)12.85 
Forfeited(511,115)6.10 
Non-vested, end of period7,507,471 $5.46 
Aggregate intrinsic value, end of period (in millions)$51.7  
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(1)Restricted incentive units typically vest at the end of three years.
(2)Vested units included 382,343 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, 2021, 2020, and 2019 is provided below (in millions):
Year Ended December 31,
ENLC Restricted Incentive Units:202120202019
Aggregate intrinsic value of units vested$5.6 $12.1 $17.3 
Fair value of units vested$16.3 $31.5 $22.8 
Summary of Grant-Date Fair Values
The following table sets out the levels at which the Tranche TSR Units may vest (using linear interpolation) based on the ENLC TSR percentile ranking for the applicable performance period relative to the TSR achievement of the Designated Peer Companies:
Performance Level Achieved ENLC TSR
Position Relative to Designated Peer Companies		 Vesting percentage
of the Tranche TSR Units
Below Threshold Less than 25% 0%
Threshold Equal to 25% 50%
Target Equal to 50% 100%
Maximum Greater than or Equal to 75% 200%
The following table sets out the levels at which the Tranche CF Units were eligible to vest (using linear interpolation) based on the FCFAD performance of ENLC for the performance period ending December 31, 2021:
Performance Level ENLC’s Achieved FCFAD Vesting percentage
of the Tranche CF Units
Below Threshold 
Less than $205 million
 0%
Threshold 
Equal to $205 million
 50%
Target 
Equal to $256 million
 100%
Maximum 
Greater than or Equal to $300 million
 200%

The following table sets out the levels at which the Tranche CF Units were eligible to vest (using linear interpolation) based on the cash flow performance of ENLC for the performance period ending December 31, 2020:
Performance Level ENLC’s Achieved 
Distributable Cash Flow per Unit		 Vesting percentage
of the Tranche CF Units
Below Threshold 
Less than $1.345
 0%
Threshold 
Equal to $1.345
 50%
Target 
Equal to $1.494
 100%
Maximum 
Greater than or Equal to $1.643
 200%

The following table sets out the levels at which the Tranche CF Units were eligible to vest (using linear interpolation) based on the cash flow performance of ENLC for the performance period ending December 31, 2019:
Performance Level ENLC’s Achieved 
Distributable Cash Flow per Unit		 Vesting percentage
of the Tranche CF Units
Below Threshold 
Less than $1.43
 0%
Threshold 
Equal to $1.43
 50%
Target 
Equal to $1.55
 100%
Maximum 
Greater than or Equal to $1.72
 200%

The fair value of each performance unit is estimated as of the date of grant using a Monte Carlo simulation with the following assumptions used for all performance unit grants made under the plan: (i) a risk-free interest rate based on United States Treasury rates as of the grant date; (ii) a volatility assumption based on the historical realized price volatility of ENLC’s common units and the Designated Peer Companies’ or Peer Companies’ securities as applicable; (iii) an estimated ranking of ENLC (or for outstanding performance units granted prior to the Merger, ENLC and ENLK) among the Designated Peer Companies or Peer Companies, and (iv) the distribution yield. The fair value of the performance unit on the date of grant is expensed over a vesting period of approximately three years.

The following table presents a summary of the grant-date fair value assumptions by performance unit grant date:
ENLC Performance Units:January 2021July 2020March 2020January 2020October 2019June 2019March 2019
Grant-date fair value$4.70 $2.33 $1.13 $7.69 $7.29 $9.92 $13.10 
Beginning TSR price$3.71 $2.52 $1.25 $6.13 $7.42 $9.84 $10.92 
Risk-free interest rate0.17 %0.17 %0.42 %1.62 %1.44 %1.72 %2.42 %
Volatility factor71.00 %67.00 %51.00 %37.00 %35.00 %33.50 %33.86 %
Summary of Performance Units
The following table presents a summary of the performance units:
Year Ended December 31, 2021
ENLC Performance Units:Number of UnitsWeighted Average Grant-Date Fair Value
Non-vested, beginning of period2,351,241 $8.82 
Granted1,388,139 4.70 
Vested (1)(164,553)26.73 
Non-vested, end of period3,574,827 $6.40 
Aggregate intrinsic value, end of period (in millions)$24.6 
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(1)Vested units included 63,901 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 years ended December 31, 2021, 2020, and 2019 is provided below (in millions).
Year Ended December 31,
ENLC Performance Units:202120202019
Aggregate intrinsic value of units vested$0.6 $0.9 $3.4 
Fair value of units vested$4.4 $5.5 $7.9