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Securities and Commodity Financing Transactions - Underlying Collateral Types of Gross Obligations (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | $ 15,997.3 | $ 9,196.4
Securities loaned | 1,124.0 | 1,117.3
Gross amount of secured financing | 17,121.3 | 10,313.7
U.S. Treasury obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 9,815.1 | 3,696.1
U.S. government agency obligations and municipal bonds |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 520.4 | 542.2
Asset-backed obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 137.7 | 102.9
Agency mortgage-backed obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 4,556.0 | 4,371.6
Foreign government obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 488.3 | 148.1
Corporate bonds |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 479.8 | 335.5
Equity securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities loaned | $ 1,124.0 | $ 1,117.3

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