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Securities and Commodity Financing Transactions - Schedule of Fair Values of Collateral Pledged, Received and Repledged (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities pledged or repledged to cover collateral requirements for tri-party arrangements | $ 8,973.9 | $ 6,767.1
Securities received as collateral that may be repledged | 23,675.4 | 20,126.8
Securities received as collateral that may be repledged covering securities sold short | 2,745.6 | 2,408.3
Asset Pledged as Collateral with Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repledged securities borrowed and client securities held under custodial clearing arrangements to collateralize securities loaned agreements | 2,032.8 | 1,533.3
Tri-party Repurchase Agreements |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities pledged or repledged to cover collateral requirements for tri-party arrangements | $ 9,637.5 | $ 6,777.9

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- Definition Fair value of the collateral, or portion thereof, that has been re-pledged, delivered, or otherwise used. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A + Details
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- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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