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Condensed Consolidated Balance Sheets Parentheticals - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020
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Statement of Financial Position [Abstract] |  |
Cash and cash equivalents, fair value | $ 2.0 | $ 2.6
Deposits and receivables from bds and counterparties at fair value | 1,193.9 | 1,775.8
Collateral that can be sold or repledged | 713.2 | 468.6
Physical commodities inventory at fair value | 299.5 | 215.7
Accounts pay and other accrued - fair value | 1.3 | 1.5
Payables to broker dealer at fair value | $ 30.6 | $ 14.7
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) | 22,026,627 | 21,798,551
Common stock - outstanding (in shares) | 19,604,670 | 19,376,594
Treasury stock - shares (in shares) | 2,421,957 | 2,421,957

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