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Employee Benefit Plans - Summary of Total RSUs Activity (Details) - shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted (in shares)   0
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted (in shares) 21,035,614  
Exercised (in shares) (131,766)  
Forfeited (in shares) (35,935)  
Outstanding (in shares) 20,867,913