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Securities and Commodity Financing Transactions - Schedule of Carrying Value of Repurchase Agreements, and Securities Lending Agreements by Remaining Contractual Maturity (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | $ 29,523.7 | $ 16,527.9
Securities loaned | 2,550.8 | 1,615.9
Gross amount of secured financing | 32,074.5 | 18,143.8
Overnight and Open |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 26,173.4 | 15,260.8
Securities loaned | 2,550.8 | 1,615.9
Gross amount of secured financing | 28,724.2 | 16,876.7
Less than 30 Days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 3,128.5 | 585.4
Securities loaned | 0.0 | 0.0
Gross amount of secured financing | 3,128.5 | 585.4
30-90 Days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 180.4 | 631.0
Securities loaned | 0.0 | 0.0
Gross amount of secured financing | 180.4 | 631.0
Over 90 Days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 41.4 | 50.7
Securities loaned | 0.0 | 0.0
Gross amount of secured financing | $ 41.4 | $ 50.7

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