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Securities and Commodity Financing Transactions - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020
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Assets Sold under Agreements to Repurchase [Line Items] |  |
Financial instruments owned and pledged as collateral, amount eligible to be repledged by counterparty | $ 713.2 | $ 468.6
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty | 22.2 | 0.0
Pledged assets separately reported, securities Pledged for repurchase agreements, at fair value | 1,699.0 | 1,484.7
Securities loaned, fair value of collateral |  | 1,410.3
Fair value of securities received as collateral that can be resold or repledged | 3,288.4 | 3,303.1
Fair value of securities received as collateral that have been resold or repledged | 255.6 | 285.7
Tri-party Repurchase Agreements |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty | $ 1,294.9 | $ 1,266.4

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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 http://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 http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions where counterparty has the right to re-pledge such. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + 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 (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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