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Stock-Based Compensation Plans - Narrative (Details)
employee in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 24,100,000 $ 3,500,000  
Total equity grant to employees     $ 150,000,000
Number of employees granted equity awards | employee     16
Unrecognized compensation expense $ 175,500,000    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting/performance period 2 years    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period 10 years    
Stock Options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting/performance period 4 years    
Stock Options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting/performance period 5 years    
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting/performance period 3 years    
Equity Awards - Founders Grant | 2013 Stock Incentive Plan and 2017 Omnibus Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 16,800,000