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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2023
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 Ended
 March 31,
Award type20232022
Stock appreciation rights$2.5 $1.9 
Restricted stock units42.2 30.0 
Common stock equivalents0.3 0.2 
Total (1)$45.0 $32.1 
Schedule of stock-based compensation expense by expense category
Three Months Ended
 March 31,
Expense category line item20232022
Cost of services and product development$18.3 $11.5 
Selling, general and administrative26.7 20.6 
Total (1)$45.0 $32.1 

(1)Includes costs of $26.8 million and $19.2 million during the three months ended March 31, 2023 and 2022, respectively, for awards to retirement-eligible employees. Those awards vest on an accelerated basis.