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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Share-based Compensation Arrangements        
Common stock, shares issued (in shares) 50,771,000      
Options outstanding and exercisable, aggregate intrinsic value $ 144.0      
Options outstanding, aggregate intrinsic value 169.5      
Options exercised in the period, intrinsic value 15.4 $ 29.8    
Options vested in the period, fair value 5.8 $ 4.8    
Unrecognized compensation cost $ 10.9      
Average vesting period for unrecognized compensation cost (in years) 2 years 4 months 24 days      
Common stock options        
Share-based Compensation Arrangements        
Options outstanding (in shares) 5,215,000 5,353,000    
Restricted stock units        
Share-based Compensation Arrangements        
Weighted average grant date fair value (in dollars per share) $ 21.02 $ 19.15    
Unrecognized compensation cost $ 46.0      
Weighted average grant date fair value (in dollars per share) $ 36.16 $ 36.23    
Intrinsic value of RSU's outstanding $ 65.6      
Remaining contractual term (in years) 3 years      
2021 Equity Incentive Award Plan        
Share-based Compensation Arrangements        
Common stock reserved for future issuance (in shares)       7,729,013
2021 Equity Incentive Award Plan | Employee Stock        
Share-based Compensation Arrangements        
Award vesting period (in years) 4 years      
Award cliff vesting period (in years) 1 year      
Shares available for grant (in shares) 5,200,000      
Options outstanding (in shares) 2,300,000      
2021 Equity Incentive Award Plan | Incentive stock options and nonqualified stock options | Minimum        
Share-based Compensation Arrangements        
Purchase price of common stock, percent 110.00%      
2021 Equity Incentive Award Plan | Incentive stock options and nonqualified stock options | Minimum | Shareholder of Ten Percent Ownership or Greater        
Share-based Compensation Arrangements        
Ownership interest, percent 10.00%      
2021 Equity Incentive Award Plan | Follow-On Options        
Share-based Compensation Arrangements        
Award vesting period (in years) 4 years      
2021 Equity Incentive Award Plan | Common stock options        
Share-based Compensation Arrangements        
Award contractual life (in years) 10 years      
Purchase price of common stock, percent 100.00%      
2021 Equity Incentive Award Plan | Restricted stock units        
Share-based Compensation Arrangements        
Award vesting period (in years) 4 years      
2008 Stock Plan | Common stock options        
Share-based Compensation Arrangements        
Options outstanding (in shares) 4,500,000      
Employee stock purchase plan        
Share-based Compensation Arrangements        
Common stock reserved for future issuance (in shares)       412,988
Shares available for grant (in shares) 1,100,000   0  
Percentage of outstanding stock maximum 1.00%      
Common stock, shares issued (in shares) 245,000      
Unrecognized compensation cost $ 0.8      
Average vesting period for unrecognized compensation cost (in years) 4 months 24 days      
Employee stock purchase plan | Maximum        
Share-based Compensation Arrangements        
Common stock reserved for future issuance (in shares) 10,526,315