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Securities and Commodity Financing Transactions - Netting of Securities Purchased Under Agreements (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
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Brokers and Dealers [Abstract] |  |
Securities purchased under agreements to resell, gross | $ 2,239.9 | $ 1,696.2
Securities Purchased under Agreements to Resell, Offset | 0.0 | 0.0
Securities purchased under agreements to resell | 2,239.9 | 1,696.2
Securities borrowed, gross | 2,163.1 | 1,440.0
Securities borrowed | 2,163.1 | 1,440.0
Securities sold under agreements to repurchase, gross | 4,340.9 | 3,155.5
Securities sold under agreements to repurchase, Offset | 0.0 | 0.0
Securities sold under agreements to repurchase | 4,340.9 | 3,155.5
Securities loaned, gross | 2,153.6 | 1,441.9
Securities loaned | $ 2,153.6 | $ 1,441.9

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