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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2023 | Sep. 30, 2023
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Statement of Financial Position [Abstract] |  |
Cash, securities and other assets segregated under federal and other regulations at fair value | $ 3.5 | $ 5.8
Deposits with and receivables from broker-dealers, clearing organizations and counterparties at fair value | 3,769.3 | 4,248.3
Receivables from clients at fair value | 1.1 | (7.9)
Financial instruments owned, securities pledged as collateral that can be sold or repledged | 1,870.2 | 1,466.4
Physical commodities inventory at fair value | 314.4 | 386.5
Accounts payable and other accrued liabilities at fair value | 1.6 | 1.5
Payables to client at fair value | 453.0 | 79.8
Payables to broker-dealers, clearing organizations and counterparties at fair value | $ 51.5 | $ 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 dollar per share) | $ 0.01 | $ 0.01
Common stock - authorized (in shares) | 200,000,000 | 200,000,000
Common stock - issued (in shares) | 35,405,165 | 35,105,852
Common stock - outstanding (in shares) | 31,494,180 | 31,194,867
Treasury stock - shares (in shares) | 3,910,985 | 3,910,985

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