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Consolidated Investment Products - Schedule of Financial Instruments of CIPs not Measured at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2025		Sep. 30, 2024
Financial Liability [Abstract]
Debt	$ 2,362.0		$ 2,780.3
CIPs [Member]
Financial Assets [Abstract]
Cash and cash equivalents	485.8		1,099.4
Financial Liability [Abstract]
Debt	9,937.3		9,341.5
Carrying Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	3,088.1		3,309.5
Financial Liability [Abstract]
Debt	2,362.0		2,780.3
Carrying Value [Member] | CIPs [Member]
Financial Assets [Abstract]
Cash and cash equivalents	13.7		335.1
Estimated Fair Value [Member] | Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	3,088.1		3,309.5
Estimated Fair Value [Member] | Level 2 [Member]
Financial Liability [Abstract]
Debt	1,970.9		2,387.0
Estimated Fair Value [Member] | CIPs [Member] | Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	13.7		335.1
Collateralized Loan Obligations [Member] | CIPs [Member]
Financial Liability [Abstract]
Debt	9,937.3		9,341.5
Collateralized Loan Obligations [Member] | Carrying Value [Member] | CIPs [Member]
Financial Liability [Abstract]
Debt	9,937.3		9,341.5
Collateralized Loan Obligations [Member] | Estimated Fair Value [Member] | CIPs [Member] | Level 2 [Member]
Financial Liability [Abstract]
Debt	$ 9,786.0	[1]	$ 9,167.3
[1] Substantially all was Level 2.

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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