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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule Of Stock-based Compensation Expense By Award Type
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 EndedSix Months Ended
 June 30,June 30,
Award type2024202320242023
Stock appreciation rights$3.0 $3.1 $7.6 $5.6 
Restricted stock units36.4 28.9 82.0 71.1 
Common stock equivalents0.3 0.3 0.6 0.6 
Total (1)$39.7 $32.3 $90.2 $77.3 
Schedule Of Stock-Based Compensation Expense By Expense Category
Three Months EndedSix Months Ended
 June 30,June 30,
Expense category line item2024202320242023
Cost of services and product development$15.3 $12.7 $34.8 $31.0 
Selling, general and administrative24.4 19.6 55.4 46.3 
Total (1)$39.7 $32.3 $90.2 $77.3 

(1)Includes costs of $18.4 million and $13.1 million during the three months ended June 30, 2024 and 2023, respectively, and $49.0 million and $39.9 million during the six months ended June 30, 2024 and 2023, respectively, for awards to retirement-eligible employees. Those awards vest on an accelerated basis.