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Securities and Commodity Financing Transactions - Netting of Securities Purchased Under Agreements (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Sep. 30, 2023
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Broker-Dealer [Abstract] |  |
Securities purchased under agreements to resell, gross | $ 7,836.3 | $ 7,649.3
Securities purchased under agreements to resell, offset | (4,036.5) | (4,669.8)
Securities purchased under agreements to resell, net | 3,799.8 | 2,979.5
Securities borrowed, gross | 994.5 | 1,129.1
Securities borrowed, net | 994.5 | 1,129.1
Securities sold under agreements to repurchase, gross | 10,090.7 | 9,196.4
Securities sold under agreements to repurchase, offset | (4,036.5) | (4,669.8)
Securities sold under agreements to repurchase, net | 6,054.2 | 4,526.6
Securities loaned, gross | 942.7 | 1,117.3
Securities loaned, net | $ 942.7 | $ 1,117.3

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