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Securities and Commodity Financing Transactions - Collateral Maturities of Gross Obligations (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | $ 24,045.9 | $ 16,527.9
Securities loaned | 1,509.9 | 1,615.9
Gross amount of secured financing | 25,555.8 | 18,143.8
Overnight and Open |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 20,159.3 | 15,260.8
Securities loaned | 1,509.9 | 1,615.9
Gross amount of secured financing | 21,669.2 | 16,876.7
Less than 30 Days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 3,377.0 | 585.4
Securities loaned | 0.0 | 0.0
Gross amount of secured financing | 3,377.0 | 585.4
30-90 Days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 410.9 | 631.0
Securities loaned | 0.0 | 0.0
Gross amount of secured financing | 410.9 | 631.0
Over 90 Days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 98.7 | 50.7
Securities loaned | 0.0 | 0.0
Gross amount of secured financing | $ 98.7 | $ 50.7

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