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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)   0 0 700,000      
Granted (in usd per share)       $ 50.63      
Expected term (in years)       5 years 3 months 18 days   4 years  
Vested in period, value       $ 0.9 $ 10.7    
Non-vested restricted stock units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total unrecognized compensation cost related to unvested restricted stock units   $ 68.2   $ 68.2      
Weighted average remaining vesting period (in years)       1 year 8 months 12 days      
2017 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares available to be issued (in shares)   2,851,988   2,851,988      
2017 Equity Incentive Plan | Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares) 700,000            
Granted (in usd per share) $ 50.63            
Compensation cost related to nonvested stock options not yet recognized   $ 17.2   $ 17.2      
2017 Equity Incentive Plan | Chief Executive Officer | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected term (in years) 3 years 4 months 24 days            
2017 Equity Incentive Plan | Chief Executive Officer | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected term (in years) 4 years 1 month 6 days            
2017 Equity Incentive Plan | Chief Executive Officer | Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Value of award at grant date $ 18.8            
Unrecognized compensation cost related to nonvested stock option recognized over weighted average period (in years)       3 years 4 months 24 days      
2017 Equity Incentive Plan | Chief Executive Officer | Stock options | Tranche One              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights percentage 25.00%            
Vesting price threshold (in usd per share) $ 175            
2017 Equity Incentive Plan | Chief Executive Officer | Stock options | Tranche Two              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights percentage 25.00%            
Vesting price threshold (in usd per share) $ 200,000,000            
2017 Equity Incentive Plan | Chief Executive Officer | Stock options | Tranche Three              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights percentage 25.00%            
Vesting price threshold (in usd per share) $ 225,000,000            
2017 Equity Incentive Plan | Chief Executive Officer | Stock options | Tranche Four              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights percentage 25.00%            
Vesting price threshold (in usd per share) $ 250,000,000            
2017 Equity Incentive Plan | Chief Executive Officer | Stock options | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected term (in years)       4 years 1 month 6 days      
2017 Equity Incentive Plan | Class A Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares available to be issued (in shares)   7,195,049   7,195,049     6,421,442
2007 Stock Option Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares available to be issued (in shares)             421,442
Number of shares available for grants (in shares)             0