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Stockholders' Equity | 9 Months Ended
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Sep. 30, 2023
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. As of September 30, 2023, approximately 0.9 million shares were available for future issuance under our current plan.
| Quarter Ended September 30, |  | Nine Months Ended September 30,
| 2023 | 2022 |  | 2023 | 2022
Total stock-based compensation expense | $ | 3.5 |  | $ | 4.0 |  |  | $ | 7.0 |  | $ | 9.6 |
Impact on cash flow due to taxes paid related to net share settlement of equity awards | $ | 0.1 |  | $ | — |  |  | $ | 4.7 |  | $ | 2.5 |
As of September 30, 2023, there was $14.6 million of total unrecognized compensation cost related to outstanding restricted stock unit awards. During the nine months ended September 30, 2023, we granted 216,379 restricted stock units (time vesting) at an average grant date fair value of $37.66 per share and 196,451 restricted stock units (performance vesting) at an average grant date fair value of $40.47 per share.

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