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Commodity and Other Repurchase Agreements Gross Obligations Collateral Types (Tables) | 12 Months Ended
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Sep. 30, 2018
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: | September 30, 2018 | September 30, 2017
U.S. Treasury obligations | $ | 39.6 |  | $ | 7.0 |
U.S. government agency obligations | 461.7 |  | 332.6 |
Asset-backed obligations | 50.0 |  | 36.4 |
Agency mortgage-backed obligations | 1,385.4 |  | 1,017.1 |
Total securities sold under agreements to repurchase | $ | 1,936.7 |  | $ | 1,393.1 |
Securities loaned: |  |
Equity securities | 277.9 |  | 111.1 |
Total securities loaned | 277.9 |  | 111.1 |
Gross amount of secured financing | $ | 2,214.6 |  | $ | 1,504.2 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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