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Consolidated Investment Products - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025 USD ($) CIPs	Mar. 31, 2024 USD ($)	Mar. 31, 2025 USD ($) CIPs	Mar. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) CIPs
Consolidated Investment Products [Abstract]
Number of consolidated investment products | CIPs	73		73		77
Number of CLOs | CIPs	21		21		22
Schedule Of Consolidated Investment Products [Line Items]
Debt	$ 2,671.3		$ 2,671.3		$ 2,780.3
CIPs [Member]
Schedule Of Consolidated Investment Products [Line Items]
Debt	9,532.3		9,532.3		9,341.5
Unfunded Commitments Company Contractually Obligated To Fund Consolidated Investment Products					9.9
Collateralized loan obligations [Member]
Schedule Of Consolidated Investment Products [Line Items]
Net gains related to its own economic interests.	15.6	$ 9.7	27.3	$ 30.5
Debt, unpaid principal balance	9,481.7		9,481.7		9,282.8
Collateralized loan obligations [Member] | CIPs [Member]
Schedule Of Consolidated Investment Products [Line Items]
Debt	$ 9,532.3		$ 9,532.3		$ 9,341.5
Effective interest rate	6.58%		6.58%		7.36%
Collateralized loan obligations [Member] | CIPs [Member] | Minimum [Member]
Schedule Of Consolidated Investment Products [Line Items]
Stated interest rate	2.39%		2.39%		2.39%
Collateralized loan obligations [Member] | CIPs [Member] | Maximum [Member]
Schedule Of Consolidated Investment Products [Line Items]
Stated interest rate	13.04%		13.04%		13.73%

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Gains Losses On Assets And Liabilities Of Consolidated Vies Net

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[Line Items] for Tabular disclosure of qualitative and quantitative information related to investment products holds, whether or not such investment products (CIP) is included in the reporting entity's consolidated financial statements. Includes, but is not limited to, description of the significant judgments and assumptions made in determining whether a CIP (as defined) held by the entity requires the CIP (as defined) to be consolidated and (or) disclose information about its involvement with the CIP, individually or in aggregate (as applicable); the nature of restrictions, if any, on the CIP's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the CIP; how involvement with the CIP affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the CIP have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the SIP, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the consolidated investment products; the significant factors considered and judgments made in determining that the power to direct the activities of a CIP that most significantly impact the CIP's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the CIP included in the statement of financial position.

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