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Segment Analysis (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 6,552.2 | $ 7,918.6 |
Operating revenues | 264.7 | 212.6 |
Net operating revenues | 149.0 | 130.3 |
Net Segment Contribution | 112.3 | 98.8 |
Segment Income | 71.5 | 58.3 |
Costs not allocated to operating segments | 47.1 | 39.7 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 24.4 | 18.6 |
Assets | 8,710.5 |  | $ 7,824.7
Commercial Hedging [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 59.8 | 61.5 |
Operating revenues | 59.8 | 61.5 |
Net operating revenues | 45.3 | 49.1 |
Net Segment Contribution | 30.6 | 36.5 |
Segment Income | 13.3 | 21.1 |
Assets | 1,901.3 |  | 1,935.7
Global Payments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 29.7 | 24.6 |
Operating revenues | 29.7 | 24.6 |
Net operating revenues | 28.4 | 23.0 |
Net Segment Contribution | 23.1 | 18.4 |
Segment Income | 18.6 | 14.6 |
Assets | 200.6 |  | 206.6
Securities Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 69.0 | 43.0 |
Operating revenues | 69.0 | 43.0 |
Net operating revenues | 32.1 | 23.5 |
Net Segment Contribution | 21.8 | 17.8 |
Segment Income | 16.0 | 11.0 |
Assets | 4,330.6 |  | 3,058.2
Physical Commodities [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 6,301.8 | 7,716.6 |
Operating revenues | 14.3 | 10.6 |
Net operating revenues | 10.4 | 8.4 |
Net Segment Contribution | 7.1 | 5.6 |
Segment Income | 5.9 | 1.1 |
Assets | 372.2 |  | 413.7
Clearing and Execution Services Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 95.2 | 72.2 |
Operating revenues | 95.2 | 72.2 |
Net operating revenues | 37.5 | 27.4 |
Net Segment Contribution | 29.7 | 20.5 |
Segment Income | 17.7 | 10.5 |
Assets | 1,821.4 |  | 2,109.9
Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (3.3) | 0.7 |
Operating revenues | (3.3) | 0.7 |
Net operating revenues | (4.7) | $ (1.1) |
Assets | $ 84.4 |  | $ 100.6

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