v3.24.2
Stock-based compensation - stock option rollforward information (Details) - Common stock - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2024
Number of options outstanding  
Beginning balance (in shares) 16.4
Granted (in shares) 0.7
Exercised (in shares) (2.3)
Forfeited (in shares) (0.7)
Ending balance (in shares) 14.1
Weighted average exercise price per outstanding option  
Beginning balance (in dollars per share) $ 21.37
Granted (in dollars per share) 24.14
Exercised (in dollars per share) 21.34
Forfeited (in dollars per share) 25.94
Ending balance (in dollars per share) $ 21.25
Other information about options outstanding  
Aggregate intrinsic value $ 31.4
Weighted average remaining term 5 years 3 months 18 days
Information about options expected to vest and exercisable  
Options expected to vest, number (in shares) 3.0
Options expected to vest, weighted average exercise price per option (in dollars per share) $ 25.12
Options expected to vest, aggregate intrinsic value $ 0.3
Options expected to vest, weighted average remaining term 8 years 8 months 12 days
Options exercisable, number (in shares) 11.1
Options exercisable, weighted average exercise price per option (in dollars per share) $ 20.24
Options exercisable, aggregate intrinsic value $ 31.1
Options exercisable, weighted average remaining term 4 years 4 months 24 days