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Stock-based Compensation - PSUs and PBOs (Details) - Performance Shares - installment
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of installments       2
Performance awards, threshold level, number of shares, multiplier       0
Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (percent)       50.00%
Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (percent)       50.00%
2021 PSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated performance goal achievement rate       136.00%
2020 PBO        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated performance goal achievement rate       68.00%
2020 PSU and PBO        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated performance goal achievement rate   88.00%    
2020 PSU and PBO | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (percent)   50.00%    
2020 PSU and PBO | Tranche Two | Forecast        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (percent) 50.00%      
2019 PSU and PBO        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated performance goal achievement rate     84.00%  
2019 PSU and PBO | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (percent)     50.00%  
2019 PSU and PBO | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (percent)   50.00%