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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2021
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 type2021202020212020
Stock appreciation rights$2.0 $1.9 $4.0 $3.6 
Restricted stock units (2)24.0 13.6 57.9 36.8 
Common stock equivalents0.2 0.2 0.4 0.4 
Total (1)$26.2 $15.7 $62.3 $40.8 
Schedule of stock-based compensation expense by expense category
Three Months EndedSix Months Ended
 June 30,June 30,
Expense category line item2021202020212020
Cost of services and product development$8.0 $7.1 $21.7 $19.2 
Selling, general and administrative18.2 8.6 40.6 21.6 
Total (1) (2)$26.2 $15.7 $62.3 $40.8 

(1) Includes charges of $11.3 million and $5.2 million during the three months ended June 30, 2021 and 2020, respectively, and $32.8 million and $16.8 million during the six months ended June 30, 2021 and 2020, respectively, for awards to retirement-eligible employees. Those awards vest on an accelerated basis.
(2) On February 5, 2020, prior to the COVID-19 related shutdown in the U.S., the Compensation Committee (“Committee”) of the Board of Directors of the Company established performance measures for the performance-based restricted stock units (the “PSUs”) awarded to the Company’s executive officers in 2020 under the Plan. Based on preliminary corporate performance results for the 2020 performance measures, the 2020 PSUs would have been earned at 50% of target. However,
on February 3, 2021, the Committee determined to use its discretion under the Plan to approve a payout at 95% of target. In deciding to exercise this discretion to adjust the performance-based RSU payout, the Committee considered the Company’s strong overall performance in 2020 despite the significant negative impact of the COVID-19 pandemic. As a result of the modification, the Company recognized $6.5 million of incremental compensation cost during the six months ended June 30, 2021.