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Securities and Commodity Financing Transactions - Underlying Collateral Types of Gross Obligations (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | $ 3,627.6 | $ 3,155.5
Securities loaned | 1,700.3 | 1,441.9
Gross amount of secured financing | 5,327.9 | 4,597.4
U.S. Treasury obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 90.8 | 815.8
U.S. government agency obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 276.3 | 279.5
Asset-backed obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 225.5 | 18.0
Agency mortgage-backed obligations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 2,853.9 | 1,990.0
Corporate bonds |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities sold under agreements to repurchase | 181.1 | 52.2
Equity securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities loaned | $ 1,700.3 | $ 1,441.9

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