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Segment Analysis (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 8,243,400,000 | $ 7,873,000,000.0 | $ 39,854,700,000 | $ 21,617,400,000 |
Operating revenues | 322,600,000 | 283,400,000 | 966,200,000 | 819,200,000 |
Net operating revenues | 227,900,000 | 165,600,000 | 641,800,000 | 479,800,000 |
Net Segment Contribution | 163,600,000 | 119,600,000 | 464,300,000 | 357,200,000 |
Segment Income | 110,700,000 | 69,600,000 | 303,800,000 | 218,300,000 |
Net costs not allocated to operating segments | 61,700,000 | 48,000,000.0 | 177,100,000 | 146,800,000 |
Other gain | 0 | 0 | 100,000 | 5,400,000 |
Income before tax | 49,000,000.0 | 21,600,000 | 126,800,000 | 76,900,000 |
Assets | 12,389,500,000 |  | 12,389,500,000 |  | $ 9,936,100,000
Commodity and Risk Management [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 65,100,000 | 86,400,000 | 236,500,000 | 226,800,000 |
Operating revenues | 65,100,000 | 86,400,000 | 236,500,000 | 226,800,000 |
Net operating revenues | 50,800,000 | 66,900,000 | 189,400,000 | 178,000,000.0 |
Net Segment Contribution | 36,000,000.0 | 48,000,000.0 | 133,900,000 | 127,900,000 |
Segment Income | 19,200,000 | 29,700,000 | 76,500,000 | 73,200,000 |
Assets | 2,112,600,000 |  | 2,112,600,000 |  | 2,041,000,000.0
Global Payments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 27,400,000 | 28,900,000 | 88,200,000 | 86,000,000.0 |
Operating revenues | 27,400,000 | 28,900,000 | 88,200,000 | 86,000,000.0 |
Net operating revenues | 26,000,000.0 | 27,500,000 | 83,800,000 | 81,700,000 |
Net Segment Contribution | 20,900,000 | 22,300,000 | 67,300,000 | 66,400,000 |
Segment Income | 15,900,000 | 17,000,000.0 | 52,000,000.0 | 51,400,000 |
Assets | 234,800,000 |  | 234,800,000 |  | 278,300,000
Securities Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 123,000,000.0 | 74,200,000 | 322,000,000.0 | 215,800,000 |
Operating revenues | 123,000,000.0 | 74,200,000 | 322,000,000.0 | 215,800,000 |
Net operating revenues | 97,100,000 | 30,300,000 | 218,300,000 | 94,400,000 |
Net Segment Contribution | 64,300,000 | 17,900,000 | 142,200,000 | 59,800,000 |
Segment Income | 51,600,000 | 8,200,000 | 106,700,000 | 36,000,000.0 |
Assets | 6,284,300,000 |  | 6,284,300,000 |  | 5,219,100,000
Physical Commodities |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 7,960,000,000.0 | 7,604,300,000 | 38,971,800,000 | 20,847,000,000.0 |
Operating revenues | 39,200,000 | 14,700,000 | 83,300,000 | 48,800,000 |
Net operating revenues | 35,700,000 | 9,700,000 | 71,100,000 | 35,200,000 |
Net Segment Contribution | 24,200,000 | 6,400,000 | 49,300,000 | 25,000,000.0 |
Segment Income | 20,300,000 | 2,800,000 | 37,500,000 | 16,500,000 |
Assets | 425,300,000 |  | 425,300,000 |  | 357,800,000
Clearing and Execution Services Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 68,900,000 | 78,900,000 | 241,300,000 | 247,700,000 |
Operating revenues | 68,900,000 | 78,900,000 | 241,300,000 | 247,700,000 |
Net operating revenues | 22,800,000 | 32,500,000 | 89,900,000 | 101,000,000.0 |
Net Segment Contribution | 18,200,000 | 25,000,000.0 | 71,600,000 | 78,100,000 |
Segment Income | 3,700,000 | 11,900,000 | 31,100,000 | 41,200,000 |
Assets | 2,546,100,000 |  | 2,546,100,000 |  | 1,892,100,000
Corporate unallocated |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 2,300,000 | 6,500,000 | 11,500,000 | 13,500,000 |
Operating revenues | 2,300,000 | 6,500,000 | 11,500,000 | 13,500,000 |
Net operating revenues | (4,500,000) | (1,300,000) | (10,700,000) | (10,500,000) |
Assets | 786,400,000 |  | 786,400,000 |  | $ 147,800,000
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (3,300,000) | (6,200,000) | (16,600,000) | (19,400,000) |
Operating revenues | $ (3,300,000) | $ (6,200,000) | $ (16,600,000) | $ (19,400,000) |

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