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Securities and Commodity Financing Transactions - Fair Value of Securities Accepted or Pledged as Collateral (Details) - USD ($)
Sep. 30, 2020
Sep. 30, 2019
Brokers and Dealers [Abstract]    
Financial instruments owned and pledged as collateral, amount eligible to be repledged by counterparty $ 468,600,000 $ 478,800,000
Financial instruments owned and pledged as collateral, amount not eligible to be repledged by counterparty 1,266,400,000 1,228,900,000
Pledged assets separately reported, securities Pledged for repurchase agreements, at fair value 1,484,700,000 1,175,100,000
Securities loaned, fair value of collateral 1,410,300,000 1,414,000,000.0
Fair value of securities received as collateral that can be resold or repledged 3,303,100,000 3,060,200,000
Fair value of securities received as collateral that have been resold or repledged $ 285,700,000 $ 329,800,000