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Securities and Commodity Financing Transactions - Underlying Collateral Types of Gross Obligations (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | $ 3,807.9 | $ 4,340.9
Securities loaned | 2,103.7 | 2,153.6
Gross amount of secured financing | 5,911.6 | 6,494.5
U.S. Treasury obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 19.7 | 106.8
U.S. government agency obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 432.1 | 354.6
Asset-backed obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 198.5 | 255.9
Agency mortgage-backed obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 3,039.9 | 3,536.2
Foreign government obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 20.2 | 0.0
Corporate bonds |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 97.5 | 87.4
Equity securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities loaned | $ 2,103.7 | $ 2,153.6

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