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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, 2023
Sep. 30, 2022
Schedule Of Consolidated Investment Products [Line Items]    
Unfunded commitments $ 45.6 $ 51.4
Nonredeemable investments with known liquidation periods    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment [1] $ 33.0 $ 32.8
Liquidation weighted-average period 3 years 3 months 18 days 3 years 4 months 24 days
Nonredeemable investments with unknown liquidation periods    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment [1] $ 17.4 $ 29.4
Redeemable Funds    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment [2] 52.0 23.8
CIPs [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Unfunded commitments [3] 0.0 0.2
Unfunded commitments Company contractually obligated to fund   0.1
CIPs [Member] | Nonredeemable investments with known liquidation periods    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment [4] 0.0 19.5
CIPs [Member] | Nonredeemable investments with unknown liquidation periods    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment [4] 19.9 12.0
CIPs [Member] | Redeemable Funds    
Schedule Of Consolidated Investment Products [Line Items]    
Alternative Investment [5] $ 126.5 $ 142.0
CIPs [Member] | Nonredeemable Private Debt, Equity and Infrastructure Funds [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Liquidation weighted-average period   3 months 18 days
[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 3.3 years and 3.4 years at March 31, 2023 and September 30, 2022.
[2] Investments are redeemable on a semi-monthly, monthly and quarterly basis.
[3] Of the total unfunded commitments, the Company was contractually obligated to fund $0.1 million based on its ownership percentage in the CIPs, at September 30, 2022.
[4] 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. As of March 31, 2023, there were no investments with known liquidation periods. Investments with known liquidation periods have an expected weighted-average life of 0.3 years at September 30, 2022.
[5] Investments are redeemable on a monthly basis and liquidation periods are unknown.