v3.24.2
Stock-based compensation (Tables)
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of components of stock-based compensation expense
The following table presents the components of stock-based compensation expense:
(in millions)
Award Classification
Three months ended June 30,
Six months ended June 30,
2024
2023
2024
2023
Stock optionsEquity$2.6 $3.6 $5.7 $7.2 
RSUsEquity8.8 5.5 17.6 14.2 
OtherBoth(0.3)0.1 0.5 0.5 
Total$11.1 $9.2 $23.8 $21.9 
Award classification:
Equity$11.6 $9.3 $24.0 $21.9 
Liability(0.5)(0.1)(0.2)— 
Schedule of information about outstanding stock options
The following table presents information about outstanding stock options:
(options and intrinsic value in millions)
Number of optionsWeighted average exercise price per optionAggregate intrinsic valueWeighted average remaining term
Balance at December 31, 2023
16.4 $21.37 
Granted0.7 24.14 
Exercised(2.3)21.34 
Forfeited(0.7)25.94 
Balance at June 30, 2024
14.1 $21.25 $31.4 5.3 years
Expected to vest3.0 25.12 0.3 8.7 years
Vested11.1 20.24 31.1 4.4 years
Schedule of information about unvested RSUs
The following table presents information about unvested RSUs:
(awards in millions)
Number of awardsWeighted average grant date fair value per award
Balance at December 31, 2023
4.0 $26.35 
Granted2.2 25.65 
Vested(0.9)25.93 
Forfeited(0.2)29.62 
Balance at June 30, 2024
5.1 $26.60