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Securities and Commodity Financing Transactions - Carrying Value of Collateral Pledged, Received and Repledged (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities pledged or repledged to cover collateral requirements for tri-party arrangements | $ 5,049.1 | $ 4,167.3
Securities received as collateral that may be repledged | 8,832.5 | 5,836.1
Securities received as collateral that may be repledged covering securities sold short | 2,005.2 | 1,615.3
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 | 754.9 | 1,146.0
Tri-party Repurchase Agreements | Asset Pledged as Collateral without Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities pledged or repledged to cover collateral requirements for tri-party arrangements | $ 4,824.6 | $ 3,787.8

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- Definition Fair value of collateral permitted, by contact or custom, to be sold or re-pledged. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition Fair value of the securities pledged as collateral against securities loaned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313 + Details
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