v3.24.1.u1
Consolidated Investment Products - Schedule of Debt of CIPs (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Sep. 30, 2023
Schedule Of Consolidated Investment Products [Line Items]    
Debt $ 3,041.0 $ 3,052.8
CIPs [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Debt $ 9,131.0 8,231.8
Other debt   $ 21.8
Effective interest rate 5.57% 6.00%
Short-Term Debt $ 15.0  
Collateralized loan obligations [Member] | CIPs [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Debt $ 9,116.0 $ 8,210.0
Effective interest rate 7.54% 7.12%
Collateralized loan obligations [Member] | CIPs [Member] | Minimum [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Stated interest rate 0.25% 2.39%
Collateralized loan obligations [Member] | CIPs [Member] | Maximum [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Stated interest rate 15.86% 15.49%