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Securities and Commodity Financing Transactions - Schedule of Netting of Securities Purchased Under Agreements (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
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Broker-Dealer [Abstract] |  |
Securities purchased under agreements to resell, gross | $ 19,374.5 | $ 13,148.1
Securities purchased under agreements to resell, offset | (11,215.2) | (7,946.6)
Securities purchased under agreements to resell, net | 8,159.3 | 5,201.5
Securities borrowed, gross | 2,486.2 | 1,662.3
Securities borrowed, offset | 0.0 | 0.0
Securities borrowed, net | 2,486.2 | 1,662.3
Securities sold under agreements to repurchase, gross | 24,590.6 | 16,527.9
Securities sold under agreements to repurchase, offset | (11,215.2) | (7,946.6)
Securities sold under agreements to repurchase, net | 13,375.4 | 8,581.3
Securities loaned, gross | 2,032.1 | 1,615.9
Securities loaned, offset | 0.0 | 0.0
Securities loaned, net | $ 2,032.1 | $ 1,615.9

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