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Segment Analysis (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 7,873,000,000 | $ 7,118,300,000 | $ 21,617,400,000 | $ 21,543,900,000 |
Operating revenues | 283,400,000 | 259,800,000 | 819,200,000 | 732,600,000 |
Net operating revenues | 165,600,000 | 154,600,000 | 479,800,000 | 439,200,000 |
Net Segment Contribution | 119,600,000 | 114,200,000 | 357,200,000 | 328,900,000 |
Segment Income | 69,600,000 | 70,400,000 | 218,300,000 | 200,900,000 |
Costs not allocated to operating segments | 48,000,000.0 | 39,500,000.0 | 146,800,000 | 121,900,000 |
Other gain | 0 | 2,000,000 | 5,400,000 | 2,000,000 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 21,600,000 | 32,900,000 | 76,900,000 | 81,000,000 |
Assets | 10,054,900,000 |  | 10,054,900,000 |  | $ 7,824,700,000
Commercial Hedging [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 86,400,000.0 | 77,900,000.0 | 226,800,000 | 217,700,000 |
Operating revenues | 86,400,000.0 | 77,900,000.0 | 226,800,000 | 217,700,000 |
Net operating revenues | 66,900,000.0 | 61,000,000.0 | 178,000,000 | 172,000,000 |
Net Segment Contribution | 48,000,000.0 | 44,300,000.0 | 127,900,000 | 125,500,000 |
Segment Income | 29,700,000.0 | 25,300,000.0 | 73,200,000 | 74,000,000 |
Assets | 2,084,400,000 |  | 2,084,400,000 |  | 1,935,700,000
Global Payments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 28,900,000.0 | 26,000,000.0 | 86,000,000 | 74,000,000 |
Operating revenues | 28,900,000.0 | 26,000,000.0 | 86,000,000 | 74,000,000 |
Net operating revenues | 27,500,000.0 | 24,700,000.0 | 81,700,000 | 69,600,000 |
Net Segment Contribution | 22,300,000.0 | 19,900,000.0 | 66,400,000 | 55,900,000 |
Segment Income | 17,000,000.0 | 16,000,000.0 | 51,400,000 | 44,100,000 |
Assets | 262,700,000 |  | 262,700,000 |  | 206,600,000
Securities Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 74,200,000.0 | 49,900,000.0 | 215,800,000 | 148,400,000 |
Operating revenues | 74,200,000.0 | 49,900,000.0 | 215,800,000 | 148,400,000 |
Net operating revenues | 30,300,000.0 | 23,600,000.0 | 94,400,000 | 74,700,000 |
Net Segment Contribution | 17,900,000.0 | 17,500,000.0 | 59,800,000 | 55,600,000 |
Segment Income | 8,200,000.0 | 10,300,000.0 | 36,000,000 | 34,100,000 |
Assets | 5,178,100,000 |  | 5,178,100,000 |  | 3,058,200,000
Physical Commodities [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 7,604,300,000.0 | 6,873,400,000.0 | 20,847,000,000 | 20,852,300,000 |
Operating revenues | 14,700,000.0 | 14,900,000.0 | 48,800,000 | 41,000,000 |
Net operating revenues | 9,700,000.0 | 11,400,000.0 | 35,200,000 | 32,300,000 |
Net Segment Contribution | 6,400,000.0 | 8,100,000.0 | 25,000,000 | 23,100,000 |
Segment Income | 2,800,000.0 | 5,100,000.0 | 16,500,000 | 11,800,000 |
Assets | 488,000,000 |  | 488,000,000 |  | 413,700,000
Clearing and Execution Services Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 78,900,000.0 | 88,900,000.0 | 247,700,000 | 249,100,000 |
Operating revenues | 78,900,000.0 | 88,900,000.0 | 247,700,000 | 249,100,000 |
Net operating revenues | 32,500,000.0 | 32,700,000.0 | 101,000,000 | 91,900,000 |
Net Segment Contribution | 25,000,000.0 | 24,400,000.0 | 78,100,000 | 68,800,000 |
Segment Income | 11,900,000.0 | 13,700,000.0 | 41,200,000 | 36,900,000 |
Assets | 1,914,000,000 |  | 1,914,000,000 |  | 2,109,900,000
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net operating revenues | (1,300,000.0) | $ 1,200,000.0 | (10,500,000) | $ (1,300,000) |
Assets | $ 127,700,000 |  | $ 127,700,000 |  | $ 100,600,000

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