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Stockholders' Equity
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Equity-Based Compensation STOCKHOLDERS' EQUITY
Common Stock Plans
We have stock-based compensation plans under which restricted stock awards and stock options are outstanding or granted subject to time or performance vesting requirements. At June 30, 2021, approximately 1.1 million shares were available for future issuance under our current plan.
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Total stock-based compensation expense
(selling, general and administrative and other operating charges, net)
$0.7 $3.4 $3.1 $4.8 
Income tax benefit related to stock-based compensation$0.2 $0.9 $0.8 $1.3 
Impact on cash flow due to taxes paid related to net share settlement of equity awards and proceeds from sale of stock under employee awards$0.1 $— $1.2 $0.7 

At June 30, 2021, $14.8 million of compensation cost related to unvested restricted stock units and performance awards had not yet been recognized.
During the six months ended June 30, 2021, we granted 162,942 restricted stock units (time vesting) at an average grant date fair value of $36.26 per share and 68,070 restricted stock units (performance vesting) at an average grant date fair value of $39.79 per share.