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Segment Analysis (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 7,118.3 | $ 5,505.9 | $ 21,543.9 | $ 17,041.1 |
Operating revenues | 259.8 | 197.6 | 732.6 | 578.9 |
Net operating revenues | 154.6 | 123.3 | 439.2 | 361.5 |
Net Segment Contribution | 114.2 | 95.7 | 328.9 | 286.3 |
Segment Income | 70.4 | 52.9 | 200.9 | 157.0 |
Costs not allocated to operating segments | 39.5 | 37.9 | 121.9 | 119.3 |
Other gain | 2.0 | 0.0 | 2.0 | 0.0 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 32.9 | 15.0 | 81.0 | 37.7 |
Assets | 7,284.9 |  | 7,284.9 |  | $ 6,243.4
Commercial Hedging [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 77.9 | 57.1 | 217.7 | 177.3 |
Operating revenues | 77.9 | 57.1 | 217.7 | 177.3 |
Net operating revenues | 61.0 | 44.2 | 172.0 | 140.3 |
Net Segment Contribution | 44.3 | 32.6 | 125.5 | 102.9 |
Segment Income | 25.3 | 16.3 | 74.0 | 50.4 |
Assets | 1,848.5 |  | 1,848.5 |  | 1,650.3
Global Payments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 26.0 | 22.5 | 74.0 | 67.1 |
Operating revenues | 26.0 | 22.5 | 74.0 | 67.1 |
Net operating revenues | 24.7 | 20.3 | 69.6 | 60.0 |
Net Segment Contribution | 19.9 | 16.2 | 55.9 | 47.9 |
Segment Income | 16.0 | 12.9 | 44.1 | 37.8 |
Assets | 284.3 |  | 284.3 |  | 199.5
Securities Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 49.9 | 40.0 | 148.4 | 115.3 |
Operating revenues | 49.9 | 40.0 | 148.4 | 115.3 |
Net operating revenues | 23.6 | 24.6 | 74.7 | 73.8 |
Net Segment Contribution | 17.5 | 20.2 | 55.6 | 58.9 |
Segment Income | 10.3 | 12.9 | 34.1 | 37.5 |
Assets | 2,712.7 |  | 2,712.7 |  | 2,101.7
Physical Commodities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 6,873.4 | 5,320.3 | 20,852.3 | 16,495.2 |
Operating revenues | 14.9 | 12.0 | 41.0 | 33.0 |
Net operating revenues | 11.4 | 10.2 | 32.3 | 27.3 |
Net Segment Contribution | 8.1 | 7.6 | 23.1 | 19.9 |
Segment Income | 5.1 | 4.3 | 11.8 | 11.2 |
Assets | 307.4 |  | 307.4 |  | 339.5
Clearing and Execution Services Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 88.9 | 65.4 | 249.1 | 193.2 |
Operating revenues | 88.9 | 65.4 | 249.1 | 193.2 |
Net operating revenues | 32.7 | 25.6 | 91.9 | 75.1 |
Net Segment Contribution | 24.4 | 19.1 | 68.8 | 56.7 |
Segment Income | 13.7 | 6.5 | 36.9 | 20.1 |
Assets | 2,026.3 |  | 2,026.3 |  | 1,818.9
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 2.2 | 0.6 | 2.4 | (7.0) |
Operating revenues | 2.2 | 0.6 | 2.4 | (7.0) |
Net operating revenues | 1.2 | $ (1.6) | (1.3) | $ (15.0) |
Assets | $ 105.7 |  | $ 105.7 |  | $ 133.5

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