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Securities and Commodity Financing Transactions - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of financial instruments owned | $ 4,167.3 | $ 4,354.6
Fair value of repledged securities | 2,372.3 | 843.3
Securities loaned, fair value of collateral | 1,146.0 | 2,097.6
Fair value of securities received as collateral that can be resold or repledged | 5,836.1 | 4,399.8
Fair value of securities received as collateral that have been resold or repledged | 1,615.3 | 1,031.1
Asset Pledged as Collateral with Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of financial instruments owned | 2,372.3 | 843.3
Asset Pledged as Collateral without Right | Tri-party Repurchase Agreements |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of financial instruments owned | 822.5 | 2,359.6
Fair value of repledged securities | $ 2,965.3 | $ 1,157.9
Repurchase agreement term | 2 years |

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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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