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Stock-based Compensation - PSUs and PBOs (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2023
USD ($)
installment
shares
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of installments | installment       2
Performance awards, threshold level, number of shares, multiplier       0
Performance Shares | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights       50.00%
Performance Shares | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights       50.00%
Performance Shares | 2022 PSU And 2022 PBO | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights   50.00%    
Performance Shares | 2022 PSU And 2022 PBO | Tranche One | Forecast        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights 50.00%      
Performance Shares | 2022 PSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated performance goal achievement rate   85.00%    
Performance Shares | 2022 PBO        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated performance goal achievement rate   42.50%    
Performance Shares | 2021 PSU And 2021 PBO | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights     50.00%  
Performance Shares | 2021 PSU And 2021 PBO | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights   50.00%    
Performance Shares | 2021 PSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated performance goal achievement rate     146.00%  
Performance Shares | 2021 PBO        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated performance goal achievement rate     73.00%  
Performance Based Options (PBOs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, performance goals achieved, target level, shares eligible to vest, multiplier       100.00%
Share-based compensation arrangement by share-based payment award, performance goals achieved, threshold level, shares eligible to vest, multiplier       25.00%
Share-based compensation arrangement by share-based payment award, performance goals achieved, superior level, shares eligible to vest, multiplier       100.00%
Grants in period (in shares) | shares       0
Compensation not yet recognized, share-based awards other than options       $ 0.1
Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment award, performance goals achieved, threshold level, shares Eligible to vest, multiplier       50.00%
Share-based compensation arrangement by share-based payment award, performance goals achieved, target level, shares eligible to vest, multiplier       100.00%
Share-based compensation arrangement by share-based payment award, performance goals achieved, superior level, shares eligible to vest, multiplier       200.00%
Grants in period (in shares) | shares       0
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation not yet recognized, stock options       $ 10.8
Stock Options | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights       25.00%
Stock Options | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights       75.00%
RSAs and RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation not yet recognized, share-based awards other than options       $ 8.0
Performance Stock Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation not yet recognized, share-based awards other than options       $ 0.8