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Consolidated Investment Products - Schedule of Investments measured at NAV (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Mar. 31, 2024
Sep. 30, 2023
Schedule Of Consolidated Investment Products [Line Items]    
Unfunded commitments $ 43.1 $ 43.1
Nonredeemable investments with known liquidation periods    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment [1] $ 36.7 $ 32.1
Liquidation weighted-average period 2 years 7 months 6 days 2 years 10 months 24 days
Nonredeemable investments with unknown liquidation periods    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment [1] $ 16.4 $ 17.4
Redeemable Funds    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment [2] 53.9 50.2
CIPs [Member] | Nonredeemable investments with unknown liquidation periods    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment 23.9 21.8 [3]
CIPs [Member] | Redeemable Funds    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment [4] $ 136.3 $ 132.2
[1] The investments are expected to be returned through distributions over the life of the funds as a result of liquidations of the funds’ underlying assets. Investments with known liquidation periods have an expected weighted-average life of 2.6 years and 2.9 years at March 31, 2024 and September 30, 2023.
[2] Investments are redeemable on a semi-monthly, monthly and quarterly basis.
[3] The investments are expected to be returned through distributions over the life of the funds as a result of liquidations of the funds’ underlying assets.
[4] Investments are redeemable on a monthly basis and liquidation periods are unknown.