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Consolidated Investment Products - Schedule of Balances of Assets and Liabilities of CIPs Measured at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Assets [Abstract] |  |
Investments, at fair value | $ 806.9 | $ 838.0
CIPs [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 11,897.4 | 11,034.9
Fair Value, Recurring [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 806.9 | 838.0
Fair Value, Recurring [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 512.2 | 552.9
Fair Value, Recurring [Member] | Level 2 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 185.3 | 168.5
Fair Value, Recurring [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 6.3 | 7.8
Fair Value, Recurring [Member] | NAV as a Practical Expedient [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 103.1 | 108.8
Fair Value, Recurring [Member] | CIPs [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 12,497.5 | 11,948.8
Fair Value, Recurring [Member] | CIPs [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 1,004.8 | 994.0
Fair Value, Recurring [Member] | CIPs [Member] | Level 2 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 10,795.0 | 10,217.1
Fair Value, Recurring [Member] | CIPs [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 573.7 | 550.6
Fair Value, Recurring [Member] | CIPs [Member] | NAV as a Practical Expedient [Member] |  |
Assets [Abstract] |  |
Total Assets Measured at Fair Value | 124.0 | 187.1
Equity and debt securities [Member] | Fair Value, Recurring [Member] | CIPs [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 2,684.9 | 1,856.3
Equity and debt securities [Member] | Fair Value, Recurring [Member] | CIPs [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 485.5 | 229.7
Equity and debt securities [Member] | Fair Value, Recurring [Member] | CIPs [Member] | Level 2 [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 1,501.9 | 889.4
Equity and debt securities [Member] | Fair Value, Recurring [Member] | CIPs [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 573.5 | 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 | 124.0 | 187.1
Loans [Member] | Fair Value, Recurring [Member] | CIPs [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 9,212.5 | 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 | 9,212.3 | 9,178.1
Loans [Member] | Fair Value, Recurring [Member] | CIPs [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Investments, at fair value | 0.2 | 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 | 9,396.7 | 9,352.1
Collateralized loan obligations [Member] | Fair Value, Recurring [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents of CLOs | 519.3 | 764.3
Receivables of CLOs | 80.8 | 149.6
Collateralized loan obligations [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents of CLOs | 519.3 | 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 | 80.8 | 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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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