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Securities and Commodity Financing Transactions - Underlying Collateral Types of Gross Obligations (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | $ 10,332.1 | $ 6,133.5
Securities loaned | 764.5 | 1,189.5
Gross amount of secured financing | 11,096.6 | 7,323.0
U.S. Treasury obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 4,777.7 | 1,311.0
U.S. government agency obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 476.0 | 604.1
Asset-backed obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 54.8 | 178.0
Agency mortgage-backed obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 4,651.0 | 3,762.5
Foreign government obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 124.1 | 97.2
Corporate bonds |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 248.5 | 180.7
Equity securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities loaned | $ 764.5 | $ 1,189.5

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