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Employee Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 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):
Three Months Ended
June 30,		Six Months Ended
June 30,
2021202020212020
Cost of unit-based compensation charged to operating expense$1.7 $2.0 $3.4 $4.2 
Cost of unit-based compensation charged to general and administrative expense4.7 5.4 9.5 12.0 
Total unit-based compensation expense$6.4 $7.4 $12.9 $16.2 
Amount of related income tax benefit recognized in net income (loss) (1)$1.5 $1.7 $3.0 $3.8 
____________________________
(1)For the three and six months ended June 30, 2021, the amount of related income tax benefit recognized in net income excluded $0.4 million and $2.9 million of income tax expense, respectively, related to book-to-tax differences recorded upon the vesting of restricted units. For the three and six months ended June 30, 2020, the amount of related income tax benefit recognized in net income (loss) excluded $6.8 million and $4.4 million of income tax expense, respectively, related to book-to-tax differences recorded upon the vesting of restricted units.
Schedule Of Restricted Stock Units Activity, ENLC A summary of the restricted incentive unit activity for the six months ended June 30, 2021 is provided below:
Six Months Ended
June 30, 2021
ENLC Restricted Incentive Units:Number of UnitsWeighted Average Grant-Date Fair Value
Non-vested, beginning of period5,350,086 $8.45 
Granted (1)3,782,744 3.76 
Vested (1)(2)(970,835)12.86 
Forfeited(335,539)6.19 
Non-vested, end of period7,826,456 $5.73 
Aggregate intrinsic value, end of period (in millions)$50.0  
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(1)Restricted incentive units typically vest at the end of three years.
(2)Vested units included 279,970 units withheld for payroll taxes paid on behalf of employees.
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units, Vested and Fair Value Vested, ENLC 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, 2021 and 2020 is provided below (in millions):
Three Months Ended
June 30,		Six Months Ended
June 30,
ENLC Restricted Incentive Units:2021202020212020
Aggregate intrinsic value of units vested$0.9 $0.8 $3.9 $10.9 
Fair value of units vested$2.3 $6.1 $12.5 $25.0 
Summary of Performance Units, ENLC
The following table presents a summary of the performance units:
Six Months Ended
June 30, 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)$22.8 
____________________________
(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 three and six months ended June 30, 2021 and 2020 is provided below (in millions).
 Three Months Ended
June 30,		Six Months Ended
June 30,
ENLC Performance Units:2021202020212020
Aggregate intrinsic value of units vested$— $— $0.6 $0.9 
Fair value of units vested$— $0.5 $4.4 $5.5 
Summary of Grant-Date Fair Values 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 2020
Grant-Date Fair Value$4.70 $2.33 $1.13 $7.69 
Beginning TSR price$3.71 $2.52 $1.25 $6.13 
Risk-free interest rate0.17 %0.17 %0.42 %1.62 %
Volatility factor71.00 %67.00 %51.00 %37.00 %