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Securities and Commodity Financing Transactions - Netting of Securities Purchased Under Agreements (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020
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Brokers and Dealers [Abstract] |  |
Securities purchased under agreements to resell, gross | $ 1,935.6 | $ 1,696.2
Securities Purchased under Agreements to Resell, offset | 0.0 | 0.0
Securities purchased under agreements to resell, net | 1,935.6 | 1,696.2
Securities borrowed, gross | 1,227.8 | 1,440.0
Securities borrowed, offset | 0.0 | 0.0
Securities borrowed, net | 1,227.8 | 1,440.0
Securities sold under agreements to repurchase, gross | 3,635.3 | 3,155.5
Securities sold under agreements to repurchase, offset | 0.0 | 0.0
Securities sold under agreements to repurchase, net | 3,635.3 | 3,155.5
Securities loaned, gross | 1,237.8 | 1,441.9
Securities loaned, offset | 0.0 | 0.0
Securities loaned, net | $ 1,237.8 | $ 1,441.9

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