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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Statement of Financial Position [Abstract]    
Cash, securities and other assets segregated under federal and other regulations at fair value $ 48.4 $ 5.8
Deposits with and receivables from broker-dealers, clearing organizations and counterparties at fair value 3,740.4 4,248.3
Receivables from clients at fair value (0.5) (7.9)
Financial instruments owned, securities pledged as collateral that can be sold or repledged 1,751.0 1,466.4
Physical commodities inventory at fair value 344.5 386.5
Accounts payable and other accrued liabilities at fair value 1.7 1.5
Payables to client at fair value 387.3 79.8
Payables to broker-dealers, clearing organizations and counterparties at fair value $ 3.6 $ 10.2
Preferred stock - par value (in dollars 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 dollars per share) $ 0.01 $ 0.01
Common stock - authorized (in shares) 200,000,000 200,000,000
Common stock - issued (in shares) 35,653,070 35,105,852
Common stock - outstanding (in shares) 31,742,085 31,194,867
Treasury stock - shares (in shares) 3,910,985 3,910,985