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Securities and Commodity Financing Transactions - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Sep. 30, 2021
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of financial instruments owned $ 3,733.5 $ 4,354.6
Fair value of repledged securities 2,040.8 843.3
Fair value of securities loaned, collateral 1,058.1 2,097.6
Fair value of securities received as collateral that can be resold or repledged 5,699.9 4,399.8
Fair value of securities received as collateral that have been resold or repledged 1,623.7 1,031.1
Asset Pledged as Collateral with Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of financial instruments owned 2,040.8 843.3
Tri-party Repurchase Agreements | Asset Pledged as Collateral without Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of financial instruments owned 699.6 2,359.6
Fair value of repledged securities $ 2,871.0 $ 1,157.9