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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Statement of Financial Position [Abstract]    
Cash, securities and other assets segregated under federal and other regulations at fair value $ 51.8 $ 5.8
Deposits with and receivables from broker-dealers, clearing organizations and counterparties at fair value 3,287.5 4,248.3
Receivables from clients at fair value (8.4) (7.9)
Financial instruments owned, securities pledged as collateral that can be sold or repledged 2,172.0 1,466.4
Physical commodities inventory at fair value 376.6 386.5
Accounts payable and other accrued liabilities at fair value 2.3 1.5
Payables to client at fair value 265.9 79.8
Payables to broker-dealers, clearing organizations and counterparties at fair value $ (1.4) $ 10.2
Preferred stock, par value (in dollar per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 1,000,000 1,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollar per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 200,000,000 200,000,000
Common stock, issued (in shares) 35,785,432 35,105,852
Common stock, outstanding (in shares) 31,874,447 31,194,867
Common stock in treasury (in shares) 3,910,985 3,910,985