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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2021 | Sep. 30, 2021
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Statement of Financial Position [Abstract] |  |
Cash and cash equivalents, fair value | $ 11.5 | $ 14.1
Deposits and receivables from broker dealers and counterparties at fair value | 1,177.9 | 1,070.6
Receivables from clients at fair value | 2.0 | 2.6
Collateral that can be sold or repledged | 1,215.2 | 843.3
Physical commodities inventory at fair value | 404.7 | 359.9
Accounts payable and other accrued liabilities at fair value | 2.8 | 2.8
Client payables at fair value | 54.5 | 291.5
Payables to broker dealer at fair value | $ 0.7 | $ 12.7
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) | 30,000,000 | 30,000,000
Common stock - issued (in shares) | 22,696,544 | 22,431,233
Common stock - outstanding (in shares) | 20,089,221 | 19,823,910
Treasury stock - shares (in shares) | 2,607,323 | 2,607,323

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