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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2024
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, 2024, the Company had 5.6 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 type2024202320242023
Stock appreciation rights$3.0 $2.5 $10.6 $8.1 
Restricted stock units31.2 24.3 113.2 95.4 
Common stock equivalents0.2 0.3 0.8 0.9 
Total (1)$34.4 $27.1 $124.6 $104.4 
Three Months EndedNine Months Ended
 September 30,September 30,
Expense category line item2024202320242023
Cost of services and product development$13.8 $11.5 $48.6 $42.5 
Selling, general and administrative20.6 15.6 76.0 61.9 
Total (1)$34.4 $27.1 $124.6 $104.4 

(1)Includes costs of $12.9 million and $8.5 million during the three months ended September 30, 2024 and 2023, respectively, and $61.9 million and $48.4 million during the nine months ended September 30, 2024 and 2023, respectively, for awards to retirement-eligible employees. Those awards are expensed on an accelerated basis.