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v3.25.2

Consolidated Investment Products - Schedule of Financial Instruments of CIPs not Measured at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Carrying Value [Member] |  |  |
Financial Assets [Abstract] |  |  |
Cash and cash equivalents |  | $ 3,253.9 | $ 3,309.5
Financial Liability [Abstract] |  |  |
Debt of CLOs1 |  | 2,666.7 | 2,780.3
Carrying Value [Member] | CIPs [Member] |  |  |
Financial Assets [Abstract] |  |  |
Cash and cash equivalents |  | 303.8 | 335.1
Estimated Fair Value [Member] | Level 1 [Member] |  |  |
Financial Assets [Abstract] |  |  |
Cash and cash equivalents |  | 3,253.9 | 3,309.5
Estimated Fair Value [Member] | Level 2 [Member] |  |  |
Financial Liability [Abstract] |  |  |
Debt of CLOs1 |  | 2,247.2 | 2,387.0
Estimated Fair Value [Member] | CIPs [Member] | Level 1 [Member] |  |  |
Financial Assets [Abstract] |  |  |
Cash and cash equivalents |  | 303.8 | 335.1
Receivables |  | 1,723.2 | 1,479.1
Financial Liability [Abstract] |  |  |
Debt of CLOs1 |  | 2,666.7 | 2,780.3
CIPs [Member] |  |  |
Financial Assets [Abstract] |  |  |
Cash and cash equivalents |  | 703.1 | 1,099.4
Receivables |  | 507.9 | 217.5
Financial Liability [Abstract] |  |  |
Debt of CLOs1 |  | 9,577.6 | 9,341.5
Collateralized loan obligations [Member] | Carrying Value [Member] | CIPs [Member] |  |  |
Financial Liability [Abstract] |  |  |
Debt of CLOs1 | [1] | 9,577.6 | 9,341.5
Collateralized loan obligations [Member] | Estimated Fair Value [Member] | CIPs [Member] | Level 2 [Member] |  |  |
Financial Liability [Abstract] |  |  |
Debt of CLOs1 | [1] | 9,520.5 | 9,167.3
Collateralized loan obligations [Member] | CIPs [Member] |  |  |
Financial Liability [Abstract] |  |  |
Debt of CLOs1 |  | $ 9,577.6 | $ 9,341.5
[1] | Substantially all was Level 2.

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