Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation (Details)

v3.23.1
Equity-Based Compensation (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
shares
Mar. 31, 2022
USD ($)
Performance Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of final number of of common stock issuable upon vesting of performance stock units     0  
Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of final number of of common stock issuable upon vesting of performance stock units     1.50  
Percentage increase (decrease) of awards granted due to total shareholder return ranking     0.15  
Class A Common Stock | Restricted Stock | Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares) | shares     180,798  
Compensation expense $ 2.2 $ 1.8 $ 4.2 $ 3.2
Unrecognized compensation expense 14.1   14.1  
Class A Common Stock | Performance Shares | Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 0.5 $ 0.0 1.0 $ 0.0
Unrecognized compensation expense $ 3.1   $ 3.1