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Commodity and Other Repurchase Agreements (Details) - USD ($) | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Securities Borrowed, Gross | $ 1,423,200,000 | $ 225,500,000 |
Securities Purchased under Agreements to Resell, Gross | 1,474,400,000 | 870,800,000 |
Securities sold under agreements to repurchase | 2,773,700,000 | 1,936,700,000 |
Fair Value of Securities Received as Collateral that Can be Resold or Repledged | 3,060,200,000 |  |
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged | 329,800,000 |  |
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty | 478,800,000 |  |
Securities Loaned, Fair Value of Collateral | 1,414,000,000.0 |  |
Financial Instruments Owned and Pledged as Collateral, Amount Not Eligible to be Repledged by Counterparty | 1,228,900,000 |  |
Securities Loaned | 1,459,900,000 | 277,900,000 |
Collateralized Financings | 4,233,600,000 | 2,214,600,000 |
Securities Purchased under Agreements to Resell, Liability | (49,900,000) | 0 |
Securities purchased under agreements to resell | 1,424,500,000 | 870,800,000 |
Securities Borrowed, Liability | 0 | 0 |
Securities Borrowed | 1,423,200,000 | 225,500,000 |
Securities Sold under Agreements to Repurchase, Gross | 2,823,600,000 | 1,936,700,000 |
Securities Sold under Agreements to Repurchase, Asset | (49,900,000) | 0 |
Securities Loaned, Gross | 1,459,900,000 | 277,900,000 |
Securities Loaned, Asset | 0 | 0 |
Sales Repurchase Agreements | 0 | 1,900,000 |
Securities Sold under Agreements to Repurchase, Fair Value of Collateral |  | 478,800,000 | $ 123,000,000
Maturity Overnight [Member] |  |  |
Securities sold under agreements to repurchase | 1,553,900,000 | 934,900,000 |
Securities Loaned | 1,459,900,000 | 277,900,000 |
Collateralized Financings | 3,013,800,000 | 1,212,800,000 |
Maturity Less than 30 Days [Member] |  |  |
Securities sold under agreements to repurchase | 565,800,000 | 661,300,000 |
Securities Loaned | 0 | 0 |
Collateralized Financings | 565,800,000 | 661,300,000 |
Maturity 30 to 90 Days [Member] |  |  |
Securities sold under agreements to repurchase | 654,000,000 | 340,500,000 |
Securities Loaned | 0 | 0 |
Collateralized Financings | 654,000,000 | 340,500,000 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Securities sold under agreements to repurchase | 2,208,700,000.0 | 1,385,400,000.0 |
Asset-backed Securities [Member] |  |  |
Securities sold under agreements to repurchase | 96,700,000 | 50,000,000 |
US Government Debt Securities [Member] |  |  |
Securities sold under agreements to repurchase | 108,800,000 | 39,600,000 |
US Government Agencies Debt Securities [Member] |  |  |
Securities sold under agreements to repurchase | 359,500,000 | 461,700,000 |
Equity Securities [Member] |  |  |
Securities Loaned | $ 1,459,900,000 | $ 277,900,000 |

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