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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2022
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, 2022, approximately 0.9 million shares were available for future issuance under our current plan.
| Quarter Ended June 30, |  | Six Months Ended June 30,
| 2022 | 2021 |  | 2022 | 2021
Total stock-based compensation expense (selling, general and administrative and other operating charges, net) | $ | 4.9 |  | $ | 0.7 |  |  | $ | 5.5 |  | $ | 3.1 |
Income tax benefit related to stock-based compensation | $ | 1.2 |  | $ | 0.2 |  |  | $ | 1.4 |  | $ | 0.8 |
Impact on cash flow due to taxes paid related to net share settlement of equity awards | $ | 1.0 |  | $ | 0.1 |  |  | $ | 2.5 |  | $ | 1.7 |
At June 30, 2022, there was $18.7 million of total unrecognized compensation cost related to outstanding restricted stock unit awards. During the six months ended June 30, 2022, we granted 210,844 restricted stock units (time vesting) at an average grant date fair value of $29.24 per share and 103,067 restricted stock units (performance vesting) at an average grant date fair value of $30.55 per share.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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