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Consolidated Investment Products - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2022
USD ($)
CIPs
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
CIPs
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
CIPs
Consolidated Investment Products [Abstract]          
Number of consolidated investment products | CIPs 58   58   60
Number of CLOs | CIPs 14   14   10
CIPs [Member] | Minimum [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Stated interest rate 3.31%   3.31%   1.63%
CIPs [Member] | Maximum [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Stated interest rate 6.00%   6.00%   2.42%
Collateralized loan obligations [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Net gains related to its own economic interests | $ $ 4.9 $ 1.1 $ 17.8 $ 8.5  
Debt, unpaid principal balance | $ $ 5,463.1   $ 5,463.1   $ 3,629.9
Collateralized loan obligations [Member] | CIPs [Member] | Minimum [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Stated interest rate 1.00%   1.00%   1.00%
Collateralized loan obligations [Member] | CIPs [Member] | Maximum [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Stated interest rate 8.27%   8.27%   8.22%