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Commodity and Other Repurchase Agreements and Collateralized Transactions Schedule of Collateralized Financings by Collateral Type (Tables) | 9 Months Ended
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Jun. 30, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] |
Securities sold under agreements to repurchase | June 30, 2019 |  | September 30, 2018
U.S. Treasury obligations | $ | 57.1 |  |  | $ | 39.6 |
U.S. government agency obligations | 259.8 |  |  | 461.7 |
Asset-backed obligations | 94.5 |  |  | 50.0 |
Agency mortgage-backed obligations | 2,489.3 |  |  | 1,385.4 |
Total securities sold under agreement to repurchase | 2,900.7 |  |  | 1,936.7 |
Securities loaned |  |  |
Equity securities | 1,240.9 |  |  | 277.9 |
Total securities loaned | 1,240.9 |  |  | 277.9 |
Gross amount of secured financing | $ | 4,141.6 |  |  | $ | 2,214.6 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of financial instruments held by the entity for its own account for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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