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Segment Analysis (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 7,918.6 | $ 6,074.4 |
Operating revenues | 212.6 | 185.5 |
Net operating revenues | 130.3 | 114.3 |
Net Segment Contribution | 98.8 | 93.4 |
Segment Income | 58.3 | 50.2 |
Costs not allocated to operating segments | 39.7 | 41.8 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 18.6 | 8.4 |
Assets | 6,808.9 |  | $ 6,243.4
Commercial Hedging [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 61.5 | 57.5 |
Operating revenues | 61.5 | 57.5 |
Net operating revenues | 49.1 | 45.6 |
Net Segment Contribution | 36.5 | 33.4 |
Segment Income | 21.1 | 15.4 |
Assets | 1,533.3 |  | 1,650.3
Global Payments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 24.6 | 23.1 |
Operating revenues | 24.6 | 23.1 |
Net operating revenues | 23.0 | 20.6 |
Net Segment Contribution | 18.4 | 16.4 |
Segment Income | 14.6 | 13.2 |
Assets | 188.2 |  | 199.5
Securities Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 43.0 | 37.4 |
Operating revenues | 43.0 | 37.4 |
Net operating revenues | 23.5 | 25.1 |
Net Segment Contribution | 17.8 | 19.8 |
Segment Income | 11.0 | 12.9 |
Assets | 2,569.1 |  | 2,101.7
Physical Commodities [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 7,716.6 | 5,898.7 |
Operating revenues | 10.6 | 9.8 |
Net operating revenues | 8.4 | 8.1 |
Net Segment Contribution | 5.6 | 5.8 |
Segment Income | 1.1 | 3.0 |
Assets | 414.7 |  | 339.5
Clearing and Execution Services Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 72.2 | 63.6 |
Operating revenues | 72.2 | 63.6 |
Net operating revenues | 27.4 | 24.1 |
Net Segment Contribution | 20.5 | 18.0 |
Segment Income | 10.5 | 5.7 |
Assets | 2,005.1 |  | 1,818.9
Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 0.7 | (5.9) |
Operating revenues | 0.7 | (5.9) |
Net operating revenues | (1.1) | $ (9.2) |
Assets | $ 98.5 |  | $ 133.5

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