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Stock-Based Compensation
 9 Months Ended
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 EndedNine Months Ended
 September 30,September 30,
Award type2023202220232022
Stock appreciation rights$2.5 $2.2 $8.1 $6.6 
Restricted stock units24.3 18.6 95.4 70.4 
Common stock equivalents0.3 0.2 0.9 0.6 
Total (1)$27.1 $21.0 $104.4 $77.6 

Three Months EndedNine Months Ended
 September 30,September 30,
Expense category line item2023202220232022
Cost of services and product development$11.5 $7.6 $42.5 $27.0 
Selling, general and administrative15.6 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.