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Securities and Commodity Financing Transactions - Collateral Maturities of Gross Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | $ 17,016.7 | $ 16,527.9
Securities loaned | 1,826.5 | 1,615.9
Gross amount of secured financing | 18,843.2 | 18,143.8
Overnight and Open |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 14,954.4 | 15,260.8
Securities loaned | 1,826.5 | 1,615.9
Gross amount of secured financing | 16,780.9 | 16,876.7
Less than 30 Days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 1,762.7 | 585.4
Securities loaned | 0.0 | 0.0
Gross amount of secured financing | 1,762.7 | 585.4
30-90 Days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 218.3 | 631.0
Securities loaned | 0.0 | 0.0
Gross amount of secured financing | 218.3 | 631.0
Over 90 Days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 81.3 | 50.7
Securities loaned | 0.0 | 0.0
Gross amount of secured financing | $ 81.3 | $ 50.7

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