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Segment Analysis (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 5,460.8 | $ 3,708.9 | $ 11,535.2 | $ 7,108.8 |
Operating revenues | 195.8 | 166.1 | 381.3 | 317.4 |
Net operating revenues | 123.9 | 112.9 | 238.2 | 215.6 |
Net Segment Contribution | 97.2 | 81.4 | 190.6 | 166.9 |
Segment Income | 53.9 | 46.7 | 104.1 | 98.1 |
Costs not allocated to operating segments | 39.6 | 26.7 | 81.4 | 66.0 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 14.3 | 20.0 | 22.7 | 32.1 |
Assets | 6,528.6 |  | 6,528.6 |  | $ 5,950.3
Commercial Hedging [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 62.7 | 54.7 | 120.2 | 110.1 |
Operating revenues | 62.7 | 54.7 | 120.2 | 110.1 |
Net operating revenues | 50.5 | 43.6 | 96.1 | 87.9 |
Net Segment Contribution | 36.9 | 30.5 | 70.3 | 62.2 |
Segment Income | 18.7 | 13.8 | 34.1 | 28.8 |
Assets | 1,654.0 |  | 1,654.0 |  | 1,637.5
Global Payments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 21.5 | 17.4 | 44.6 | 35.7 |
Operating revenues | 21.5 | 17.4 | 44.6 | 35.7 |
Net operating revenues | 19.1 | 15.5 | 39.7 | 31.8 |
Net Segment Contribution | 15.3 | 12.4 | 31.7 | 25.4 |
Segment Income | 11.7 | 9.3 | 24.9 | 19.3 |
Assets | 172.4 |  | 172.4 |  | 191.4
Securities Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 37.9 | 45.6 | 75.3 | 94.4 |
Operating revenues | 37.9 | 45.6 | 75.3 | 94.4 |
Net operating revenues | 24.1 | 31.8 | 49.2 | 67.8 |
Net Segment Contribution | 18.9 | 25.0 | 38.7 | 54.5 |
Segment Income | 11.7 | 18.2 | 24.6 | 40.1 |
Assets | 2,611.0 |  | 2,611.0 |  | 2,130.7
Physical Commodities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 5,276.2 | 3,550.7 | 11,174.9 | 6,805.2 |
Operating revenues | 11.2 | 7.9 | 21.0 | 13.8 |
Net operating revenues | 9.0 | 6.8 | 17.1 | 11.5 |
Net Segment Contribution | 6.5 | 5.3 | 12.3 | 8.7 |
Segment Income | 3.9 | 1.9 | 6.9 | 2.9 |
Assets | 309.1 |  | 309.1 |  | 258.0
Clearing and Execution Services Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 64.2 | 33.3 | 127.8 | 63.1 |
Operating revenues | 64.2 | 33.3 | 127.8 | 63.1 |
Net operating revenues | 25.4 | 10.4 | 49.5 | 20.8 |
Net Segment Contribution | 19.6 | 8.2 | 37.6 | 16.1 |
Segment Income | 7.9 | 3.5 | 13.6 | 7.0 |
Assets | 1,651.2 |  | 1,651.2 |  | 1,617.4
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (1.7) | 7.2 | (7.6) | 0.3 |
Operating revenues | (1.7) | 7.2 | (7.6) | 0.3 |
Net operating revenues | (4.2) | $ 4.8 | (13.4) | $ (4.2) |
Assets | $ 130.9 |  | $ 130.9 |  | $ 115.3

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