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Consolidated Investment Products - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
USD ($)
CIPs
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
CIPs
Mar. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
CIPs
Consolidated Investment Products [Abstract]          
Number of consolidated investment products | CIPs 81   81   70
Number of CLOs | CIPs 22   22   20
Collateralized loan obligations [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Net gains related to its own economic interests. | $ $ 9.7 $ 4.8 $ 30.5 $ 2.5  
Debt, unpaid principal balance | $ $ 9,037.2   $ 9,037.2   $ 8,281.5
Collateralized loan obligations [Member] | CIPs [Member] | Minimum [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Stated interest rate 0.25%   0.25%   2.39%
Collateralized loan obligations [Member] | CIPs [Member] | Maximum [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Stated interest rate 15.86%   15.86%   15.49%