Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation (Details)

v3.21.2
Equity-Based Compensation (Details) - Class A Common Stock - Restricted Stock - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Sep. 30, 2019
Non-Employee Directors Under the Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares)       292,534
Aggregate grant date fair value       $ 3.8
Compensation expense $ 0.3   $ 1.0  
Unrecognized compensation expense $ 0.7   0.7  
Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares) 510,733 510,733    
Aggregate grant date fair value   $ 13.6    
Compensation expense $ 1.0   1.2  
Unrecognized compensation expense $ 12.4   $ 12.4