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Securities and Commodity Financing Transactions - Netting of Securities Purchased Under Agreements (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Broker-Dealer [Abstract] |  |
Securities purchased under agreements to resell, gross | $ 7,649.3 | $ 4,609.9
Securities purchased under agreements to resell, offset | (4,669.8) | (2,937.9)
Securities purchased under agreements to resell, net | 2,979.5 | 1,672.0
Securities borrowed, gross | 1,129.1 | 1,209.8
Securities borrowed, net | 1,129.1 | 1,209.8
Securities sold under agreements to repurchase, gross | 9,196.4 | 6,133.5
Securities sold under agreements to repurchase, offset | (4,669.8) | (2,937.9)
Securities sold under agreements to repurchase, net | 4,526.6 | 3,195.6
Securities loaned, gross | 1,117.3 | 1,189.5
Securities loaned, net | $ 1,117.3 | $ 1,189.5

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