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Securities and Commodity Financing Transactions - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Assets Sold under Agreements to Repurchase [Line Items]    
Financial instruments owned and pledged as collateral, amount eligible to be repledged by counterparty $ 1,215.2 $ 843.3
Pledged assets separately reported, securities Pledged for repurchase agreements, at fair value 1,322.9 1,157.9
Securities loaned, fair value of collateral 2,670.1 2,097.6
Fair value of securities received as collateral that can be resold or repledged 5,195.0 4,399.8
Fair value of securities received as collateral that have been resold or repledged 1,087.2 1,031.1
Tri-party Repurchase Agreements    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty $ 1,569.8 $ 2,359.6