Consolidated Investment Products - Schedule of Investments measured at NAV (Details) - USD ($) $ in Millions |
9 Months Ended | 12 Months Ended | ||||||||||
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Jun. 30, 2022 |
Sep. 30, 2021 |
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Schedule Of Consolidated Investment Products [Line Items] | ||||||||||||
Unfunded commitments | $ 51.4 | $ 51.8 | ||||||||||
Nonredeemable investments with known liquidation periods | ||||||||||||
Schedule Of Consolidated Investment Products [Line Items] | ||||||||||||
Alternative Investment | [1] | $ 33.9 | $ 53.9 | |||||||||
Liquidation weighted-average period | 3 years 7 months 6 days | 4 years | ||||||||||
Nonredeemable investments with unknown liquidation periods | ||||||||||||
Schedule Of Consolidated Investment Products [Line Items] | ||||||||||||
Alternative Investment | [1] | $ 35.8 | $ 46.6 | |||||||||
Redeemable Funds | ||||||||||||
Schedule Of Consolidated Investment Products [Line Items] | ||||||||||||
Alternative Investment | [2] | 25.6 | 26.9 | |||||||||
CIPs [Member] | ||||||||||||
Schedule Of Consolidated Investment Products [Line Items] | ||||||||||||
Unfunded commitments | [3] | 0.2 | 0.5 | |||||||||
Unfunded commitments Company contractually obligated to fund | 0.1 | 0.2 | ||||||||||
CIPs [Member] | Nonredeemable investments with known liquidation periods | ||||||||||||
Schedule Of Consolidated Investment Products [Line Items] | ||||||||||||
Alternative Investment | [4] | 38.2 | 141.4 | |||||||||
CIPs [Member] | Nonredeemable investments with unknown liquidation periods | ||||||||||||
Schedule Of Consolidated Investment Products [Line Items] | ||||||||||||
Alternative Investment | [4] | 12.2 | 0.0 | |||||||||
CIPs [Member] | Redeemable Funds | ||||||||||||
Schedule Of Consolidated Investment Products [Line Items] | ||||||||||||
Alternative Investment | [5] | $ 167.3 | $ 202.1 | |||||||||
CIPs [Member] | Nonredeemable Private Debt, Equity and Infrastructure Funds [Member] | ||||||||||||
Schedule Of Consolidated Investment Products [Line Items] | ||||||||||||
Liquidation weighted-average period | 6 months | 1 year 3 months 18 days | ||||||||||
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