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Consolidated Investment Products - Schedule of Investments measured at NAV (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
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Schedule Of Consolidated Investment Products [Line Items] |  |  |  |
Unfunded commitments |  | $ 12.5 |  | $ 14.0
Nonredeemable investments with known liquidation periods |  |  |  |
Schedule Of Consolidated Investment Products [Line Items] |  |  |  |
Alternative Investment | [1] | 19.5 |  | 32.4
Nonredeemable investments with unknown liquidation periods |  |  |  |
Schedule Of Consolidated Investment Products [Line Items] |  |  |  |
Alternative Investment | [1] | 15.3 |  | 16.1
Redeemable Funds |  |  |  |
Schedule Of Consolidated Investment Products [Line Items] |  |  |  |
Alternative Investment | [2] | 61.5 |  | 60.3
CIPs [Member] |  |  |  |
Schedule Of Consolidated Investment Products [Line Items] |  |  |  |
Unfunded commitments |  | 0.0 | [3],[4],[5] | 42.8
CIPs [Member] | Nonredeemable investments with unknown liquidation periods |  |  |  |
Schedule Of Consolidated Investment Products [Line Items] |  |  |  |
Alternative Investment |  | 105.2 |  | 49.0
CIPs [Member] | Redeemable Funds |  |  |  |
Schedule Of Consolidated Investment Products [Line Items] |  |  |  |
Alternative Investment |  | $ 63.5 |  | $ 138.1
[1] | The investments are expected to be returned through distributions over the life of the funds as a result of liquidations of the funds’ underlying assets. Investments with known liquidation periods have an expected weighted-average life of 2.4 years and 1.9 years at June 30, 2025 and September 30, 2024.
[2] | Investments are redeemable on a semi-monthly, monthly and quarterly basis.
[3] | Investments are redeemable on a monthly basis and liquidation periods are unknown.
[4] | Of the total unfunded commitments, the Company was contractually obligated to fund $9.9 million based on its ownership percentage in the CIPs, at September 30, 2024.
[5] | The investments are expected to be returned through distributions over the life of the funds as a result of liquidations of the funds’ underlying assets.

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- Definition [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. + References No definition available. + Details
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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 54B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482134/820-10-35-54B Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A + Details
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