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Commodity and Other Repurchase Agreements (Notes) | 12 Months Ended
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Sep. 30, 2018
Commodity and Other Repurchase Agreements [Abstract] |
Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] | Securities and Commodity Financing Transactions The Company’s outstanding notes receivable in connection with repurchase agreements for agricultural and energy commodities, whereby the clients sell to the Company certain commodity inventory and agree to repurchase the commodity inventory at a future date at a fixed price were $1.9 million and $0.8 million as of September 30, 2018 and 2017, respectively. The Company enters into securities purchased under agreements to resell, securities sold under agreements to repurchase, securities borrowed and securities loaned transactions to, among other things, finance financial instruments, acquire securities to cover short positions, acquire securities for settlement, and to accommodate counterparties’ needs. These agreements are recorded as collateralized financings at their contractual amounts plus accrued interest. The related interest is recorded in the consolidated income statements as interest income or interest expense, as applicable. In connection with these agreements and transactions, it is the policy of the Company to receive or pledge cash or securities to adequately collateralize such agreements and transactions in accordance with general industry guidelines and practices. The value of the collateral is valued daily and the Company may require counterparties to deposit additional collateral or return collateral pledged, when appropriate. The carrying amounts of these agreements and transactions approximate fair value due to their short-term nature and the level of collateralization. The Company pledges financial instruments owned to collateralize repurchase agreements. At September 30, 2018 and 2017, financial instruments owned, at fair value of $123.0 million and $19.4 million, respectively, were pledged as collateral under repurchase agreements. The counterparty has the right to repledge the collateral in connection with these transactions. These financial instruments owned have been pledged as collateral and have been parenthetically disclosed on the consolidated balance sheet. In addition, as of September 30, 2018 and 2017, the Company pledged financial instruments owned, at fair value of $1,481.1 million and $1,306.4 million, respectively, and securities received under reverse repurchase agreements of $369.8 million and $100.2 million, respectively, to cover collateral requirements for tri-party repurchase agreements. For these securities, the counterparties do not have the right to sell or repledge the collateral and, therefore, they have not been parenthetically disclosed on the consolidated balance sheet. The Company also has repledged securities borrowed and client securities held under custodial clearing arrangements to collateralize securities loaned agreements with a fair value of $267.9 million and $108.4 million as of September 30, 2018 and 2017, respectively. Additionally, the Company has also pledged financial instruments owned of $27.1 million and $12.7 million as of September 30, 2018 and 2017, respectively, to collateralize uncommitted loan facilities with certain banks as discussed further in Note 10. At September 30, 2018 and 2017, the Company had accepted collateral that it is permitted by contract to sell or repledge. This collateral consists primarily of securities received in reverse repurchase agreements, securities borrowed agreements, and margin securities held on behalf of correspondent brokers. The fair value of such collateral at September 30, 2018 and 2017 was $1,294.8 million and $631.7 million, respectively, of which $473.9 million and $306.9 million, respectively, was used to cover securities sold short which are recorded in financial instruments sold, not yet purchased on the consolidated balance sheet. In the normal course of business, this collateral is used by the Company to cover financial instruments sold, not yet purchased, to obtain financing in the form of repurchase agreements, and to meet counterparties’ needs under lending arrangements. The following tables provide the contractual maturities of gross obligations under repurchase and securities lending agreements as of September 30, 2018 and 2017 (in millions):
| September 30, 2018
| Overnight and Open | Less than 30 Days | 30-90 Days | Total
Securities sold under agreements to repurchase | $ | 934.9 |  | $ | 661.3 |  | $ | 340.5 |  | $ | 1,936.7 |
Securities loaned | 277.9 |  | — |  | — |  | 277.9 |
Gross amount of secured financing | $ | 1,212.8 |  | $ | 661.3 |  | $ | 340.5 |  | $ | 2,214.6 |
| September 30, 2017
| Overnight and Open | Less than 30 Days | 30-90 Days | Total
Securities sold under agreements to repurchase | $ | 640.2 |  | $ | 432.9 |  | $ | 320.0 |  | $ | 1,393.1 |
Securities loaned | 111.1 |  | — |  | — |  | 111.1 |
Gross amount of secured financing | $ | 751.3 |  | $ | 432.9 |  | $ | 320.0 |  | $ | 1,504.2 |
The following table provides the underlying collateral types of the gross obligations under repurchase and securities lending agreements as of September 30, 2018 and 2017 (in millions):
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 Commodity and Other Repurchase Agreements [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for repurchase agreements (also known as repos), resale agreements (also known as reverse repurchase agreements or reverse repos), securities borrowed transactions, and securities loaned transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -URI http://asc.fasb.org/topic&trid=2197590 + Details
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