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Segment Analysis (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 5,505.9 | $ 4,868.5 | $ 17,041.1 | $ 11,977.3 |
Operating revenues | 197.6 | 175.0 | 578.9 | 492.4 |
Net operating revenues | 123.3 | 117.3 | 361.5 | 332.9 |
Net Segment Contribution | 95.7 | 87.4 | 286.3 | 254.3 |
Segment Income | 52.9 | 54.4 | 157.0 | 152.5 |
Costs not allocated to operating segments | 37.9 | 33.0 | 119.3 | 99.0 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 15.0 | 21.4 | 37.7 | 53.5 |
Assets | 6,195.9 |  | 6,195.9 |  | $ 5,950.3
Commercial Hedging [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 57.1 | 71.9 | 177.3 | 182.0 |
Operating revenues | 57.1 | 71.9 | 177.3 | 182.0 |
Net operating revenues | 44.2 | 57.7 | 140.3 | 145.6 |
Net Segment Contribution | 32.6 | 41.4 | 102.9 | 103.6 |
Segment Income | 16.3 | 25.4 | 50.4 | 54.2 |
Assets | 1,591.0 |  | 1,591.0 |  | 1,637.5
Global Payments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 22.5 | 18.4 | 67.1 | 54.1 |
Operating revenues | 22.5 | 18.4 | 67.1 | 54.1 |
Net operating revenues | 20.3 | 16.4 | 60.0 | 48.2 |
Net Segment Contribution | 16.2 | 13.2 | 47.9 | 38.6 |
Segment Income | 12.9 | 9.9 | 37.8 | 29.2 |
Assets | 257.2 |  | 257.2 |  | 191.4
Securities Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 40.0 | 41.6 | 115.3 | 136.0 |
Operating revenues | 40.0 | 41.6 | 115.3 | 136.0 |
Net operating revenues | 24.6 | 27.7 | 73.8 | 95.5 |
Net Segment Contribution | 20.2 | 21.2 | 58.9 | 75.7 |
Segment Income | 12.9 | 14.4 | 37.5 | 54.5 |
Assets | 2,300.7 |  | 2,300.7 |  | 2,130.7
Physical Commodities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 5,320.3 | 4,701.2 | 16,495.2 | 11,506.4 |
Operating revenues | 12.0 | 7.7 | 33.0 | 21.5 |
Net operating revenues | 10.2 | 6.2 | 27.3 | 17.7 |
Net Segment Contribution | 7.6 | 3.6 | 19.9 | 12.3 |
Segment Income | 4.3 | 1.3 | 11.2 | 4.2 |
Assets | 304.2 |  | 304.2 |  | 258.0
Clearing and Execution Services Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 65.4 | 33.3 | 193.2 | 96.4 |
Operating revenues | 65.4 | 33.3 | 193.2 | 96.4 |
Net operating revenues | 25.6 | 10.0 | 75.1 | 30.8 |
Net Segment Contribution | 19.1 | 8.0 | 56.7 | 24.1 |
Segment Income | 6.5 | 3.4 | 20.1 | 10.4 |
Assets | 1,590.5 |  | 1,590.5 |  | 1,617.4
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 0.6 | 2.1 | (7.0) | 2.4 |
Operating revenues | 0.6 | 2.1 | (7.0) | 2.4 |
Net operating revenues | (1.6) | $ (0.7) | (15.0) | $ (4.9) |
Assets | $ 152.3 |  | $ 152.3 |  | $ 115.3

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