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Securities and Commodity Financing Transactions - Schedule of Netting of Securities Purchased Under Agreements (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Broker-Dealer [Abstract] |  |
Securities purchased under agreements to resell, gross | $ 26,298.1 | $ 13,148.1
Securities purchased under agreements to resell, offset | (15,972.7) | (7,946.6)
Securities purchased under agreements to resell, net | 10,325.4 | 5,201.5
Securities borrowed, gross | 2,743.1 | 1,662.3
Securities borrowed, net | 2,743.1 | 1,662.3
Securities sold under agreements to repurchase, gross | 29,523.7 | 16,527.9
Securities sold under agreements to repurchase, offset | (15,972.7) | (7,946.6)
Securities sold under agreements to repurchase, net | 13,551.0 | 8,581.3
Securities loaned, gross | 2,550.8 | 1,615.9
Securities loaned, net | $ 2,550.8 | $ 1,615.9

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