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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company grants stock-based compensation awards as an incentive for employees and directors to contribute to the Company’s long-term success. The Company currently awards stock-settled stock appreciation rights, service-based and performance-based restricted stock units, and common stock equivalents. As of September 30, 2023, the Company had 6.0 million shares of its common stock, par value $0.0005 per share, (the “Common Stock”) available for stock-based compensation awards under the Gartner, Inc. Long-Term Incentive Plan as amended and restated in June 2023 (the “Plan”). The tables below summarize the Company’s stock-based compensation expense by award type and expense category line item during the periods indicated (in millions).
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
Award type |  | 2023 |  | 2022 |  | 2023 |  | 2022
Stock appreciation rights |  | $ | 2.5 |  |  | $ | 2.2 |  |  | $ | 8.1 |  |  | $ | 6.6 |
Restricted stock units |  | 24.3 |  |  | 18.6 |  |  | 95.4 |  |  | 70.4 |
Common stock equivalents |  | 0.3 |  |  | 0.2 |  |  | 0.9 |  |  | 0.6 |
Total (1) |  | $ | 27.1 |  |  | $ | 21.0 |  |  | $ | 104.4 |  |  | $ | 77.6 |
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
Expense category line item |  | 2023 |  | 2022 |  | 2023 |  | 2022
Cost of services and product development |  | $ | 11.5 |  |  | $ | 7.6 |  |  | $ | 42.5 |  |  | $ | 27.0 |
Selling, general and administrative |  | 15.6 |  |  | 13.4 |  |  | 61.9 |  |  | 50.6 |
Total (1) |  | $ | 27.1 |  |  | $ | 21.0 |  |  | $ | 104.4 |  |  | $ | 77.6 |
(1)Includes costs of $8.5 million and $5.4 million during the three months ended September 30, 2023 and 2022, respectively, and $48.4 million and $32.7 million during the nine months ended September 30, 2023 and 2022, respectively, for awards to retirement-eligible employees. Those awards vest on an accelerated basis.

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