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Consolidated Investment Products - Schedule of Balances of Assets and Liabilities of CIPs Measured at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Assets [Abstract] |  |
Investments, at fair value | $ 1,080.6 | $ 838.0
CIPs [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 11,420.7 | 11,034.9
Fair Value, Recurring [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 1,064.5 | 838.0
Fair Value, Recurring [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 736.3 | 552.9
Fair Value, Recurring [Member] | Level 2 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 226.9 | 168.5
Fair Value, Recurring [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 5.0 | 7.8
Fair Value, Recurring [Member] | NAV as a Practical Expedient [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 96.3 | 108.8
Fair Value, Recurring [Member] | CIPs [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 12,173.0 | 11,948.8
Fair Value, Recurring [Member] | CIPs [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 611.6 | 994.0
Fair Value, Recurring [Member] | CIPs [Member] | Level 2 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 10,832.2 | 10,217.1
Fair Value, Recurring [Member] | CIPs [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 560.5 | 550.6
Fair Value, Recurring [Member] | CIPs [Member] | NAV as a Practical Expedient [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 168.7 | 187.1
Equity and debt securities [Member] | Fair Value, Recurring [Member] | CIPs [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 1,660.5 | 1,856.3
Equity and debt securities [Member] | Fair Value, Recurring [Member] | CIPs [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 212.3 | 229.7
Equity and debt securities [Member] | Fair Value, Recurring [Member] | CIPs [Member] | Level 2 [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 728.9 | 889.4
Equity and debt securities [Member] | Fair Value, Recurring [Member] | CIPs [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 550.6 | 550.1
Equity and debt securities [Member] | Fair Value, Recurring [Member] | CIPs [Member] | NAV as a Practical Expedient [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 168.7 | 187.1
Loans [Member] | Fair Value, Recurring [Member] | CIPs [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 9,760.2 | 9,178.6
Loans [Member] | Fair Value, Recurring [Member] | CIPs [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 0.0 | 0.0
Loans [Member] | Fair Value, Recurring [Member] | CIPs [Member] | Level 2 [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 9,750.3 | 9,178.1
Loans [Member] | Fair Value, Recurring [Member] | CIPs [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 9.9 | 0.5
Loans [Member] | Fair Value, Recurring [Member] | CIPs [Member] | NAV as a Practical Expedient [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 0.0 | 0.0
Collateralized loan obligations [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 9,939.1 | 9,352.1
Collateralized loan obligations [Member] | Fair Value, Recurring [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents of CLOs | 399.3 | 764.3
Receivables of CLOs | 353.0 | 149.6
Collateralized loan obligations [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents of CLOs | 399.3 | 764.3
Receivables of CLOs | 0.0 | 0.0
Collateralized loan obligations [Member] | Fair Value, Recurring [Member] | Level 2 [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents of CLOs | 0.0 | 0.0
Receivables of CLOs | 353.0 | 149.6
Collateralized loan obligations [Member] | Fair Value, Recurring [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents of CLOs | 0.0 | 0.0
Receivables of CLOs | 0.0 | 0.0
Collateralized loan obligations [Member] | Fair Value, Recurring [Member] | NAV as a Practical Expedient [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents of CLOs | 0.0 | 0.0
Receivables of CLOs | $ 0.0 | $ 0.0

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