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Condensed Consolidated Balance Sheets Parentheticals - USD ($) $ in Millions | Jun. 30, 2019 | Sep. 30, 2018
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Balance Sheet Parentheticals [Abstract] |  |
Securities and other assets segregated, fair value | $ 235.8 | $ 643.3
Dep and rec -b/d - fair value | 422.7 | 517.4
Physical commodities inventory at fair value | 202.9 | 156.9
Collateral that can be sold or repledged | 285.5 | 123.0
Accounts pay and other accrued - fair value | 0.0 | 0.0
Payables to b/d - fair value | $ 15.8 | $ 0.0
Preferred stock - par value | $ 0.01 | $ 0.01
Preferred stock - authorized | 1,000,000 | 1,000,000
Preferred stock - issued | 0 | 0
Preferred stock - outstanding | 0 | 0
Common stock - par value | $ 0.01 | $ 0.01
Common stock - authorized | 30,000,000 | 30,000,000
Common stock - issued | 21,218,132 | 21,030,497
Common stock - outstanding | 19,096,175 | 18,908,540
Treasury stock - shares | 2,121,957 | 2,121,957

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