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Equity-Based Compensation - Class B Units (Details)
1 Months Ended 9 Months Ended
Mar. 31, 2015
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion ratio   1.25  
Class B Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion ratio 0.8    
Number of units issued in the period (in shares) | shares   0 0
Class B Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Service-based vesting period 4 years    
Participation threshold   $ 0  
Class B Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Service-based vesting period 5 years    
Participation threshold   $ 12