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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2025
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, 2025, the Company had 5.2 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 type2025202420252024
Stock appreciation rights$2.8 $3.0 $10.2 $10.6 
Restricted stock units27.5 31.2 112.8 113.2 
Common stock equivalents0.2 0.2 0.7 0.8 
Total (1)$30.5 $34.4 $123.7 $124.6 

Three Months EndedNine Months Ended
 September 30,September 30,
Expense category line item2025202420252024
Cost of services and product development$11.5 $13.8 $49.0 $48.6 
Selling, general and administrative19.0 20.6 74.7 76.0 
Total (1)$30.5 $34.4 $123.7 $124.6 

(1)Includes costs of $11.0 million and $12.9 million during the three months ended September 30, 2025 and 2024, respectively, and $58.0 million and $61.9 million during the nine months ended September 30, 2025 and 2024, respectively, for awards to retirement-eligible employees. Those awards are expensed on an accelerated basis.