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Commodity and Other Repurchase Agreements and Collateralized Transactions Schedule of Gross Collateralized Financings by Maturity (Tables) | 9 Months Ended
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Jun. 30, 2020
Assets Sold under Agreements to Repurchase [Line Items] |
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block] |
| June 30, 2020
| Overnight and Open |  | Less than 30 Days |  | 30-90 Days |  | Over 90 Days |  | Total
Securities sold under agreements to repurchase | $ | 2,079.3 |  |  | $ | 899.1 |  |  | $ | 492.0 |  |  | $ | 60.0 |  |  | $ | 3,530.4 |
Securities loaned | 1,459.7 |  |  | — |  |  | — |  |  | — |  |  | 1,459.7 |
Gross amount of secured financing | $ | 3,539.0 |  |  | $ | 899.1 |  |  | $ | 492.0 |  |  | $ | 60.0 |  |  | $ | 4,990.1 |
| September 30, 2019
| Overnight and Open |  | Less than 30 Days |  | 30-90 Days |  | Over 90 Days |  | Total
Securities sold under agreements to repurchase | $ | 1,553.9 |  |  | $ | 565.8 |  |  | $ | 654.0 |  |  | $ | — |  |  | $ | 2,773.7 |
Securities loaned | 1,459.9 |  |  | — |  |  | — |  |  | — |  |  | 1,459.9 |
Gross amount of secured financing | $ | 3,013.8 |  |  | $ | 565.8 |  |  | $ | 654.0 |  |  | $ | — |  |  | $ | 4,233.6 |

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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, as of the most recent balance sheet date, of securities or other assets sold under repurchase agreements when this amount exceeds 10 percent of total assets. Disclosure may include the following: the type of securities or assets sold under agreements to repurchase, the carrying amount, market value (including accrued interest plus any cash or other assets on deposit. The information is segregated into securities maturing (1) overnight; (2) term up to 30 days; (3) term of 30 to 90 days; (4) term over 90 days; (5) demand. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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