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Segment and Geographic Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 6,078.8 | $ 7,118.3 | $ 6,507.0 | $ 7,918.6 | $ 12,382.5 | $ 5,505.9 | $ 5,460.8 | $ 6,074.4 | $ 27,622.7 | $ 29,423.6 | $ 14,754.9
Operating revenues | 243.2 | 259.8 | 260.2 | 212.6 | 205.1 | 197.6 | 195.8 | 185.5 | 975.8 | 784.0 | 671.0
Revenues, Net of Interest Expense | 142.4 | 154.6 | 154.3 | 130.3 | 131.1 | 123.3 | 123.9 | 114.3 | 581.6 | 492.6 | 443.9
Net Segment Contribution |  |  |  |  |  |  |  |  | 432.4 | 387.0 | 347.0
Segment Income |  |  |  |  |  |  |  |  | 261.9 | 169.0 | 206.0
Costs not allocated to operating segments |  |  |  |  |  |  |  |  | 162.4 | 153.8 | 139.5
Other gains |  |  |  |  |  |  |  |  | 2.0 | 0.0 | 6.2
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 20.5 | $ 32.9 | $ 29.5 | $ 18.6 | (22.5) | $ 15.0 | $ 14.3 | $ 8.4 | 101.5 | 15.2 | 72.7
Assets | 7,824.7 |  |  |  | 6,243.4 |  |  |  | 7,824.7 | 6,243.4 | 5,950.3
Commercial Hedging [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 286.7 | 244.6 | 236.1
Operating revenues |  |  |  |  |  |  |  |  | 286.7 | 244.6 | 236.1
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 226.4 | 194.3 | 188.2
Net Segment Contribution |  |  |  |  |  |  |  |  | 164.7 | 141.8 | 134.4
Segment Income |  |  |  |  |  |  |  |  | 96.4 | 72.8 | 68.7
Assets | 1,935.7 |  |  |  | 1,650.3 |  |  |  | 1,935.7 | 1,650.3 | 1,637.5
Global Payments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 99.2 | 89.2 | 73.2
Operating revenues |  |  |  |  |  |  |  |  | 99.2 | 89.2 | 73.2
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 93.5 | 80.6 | 65.3
Net Segment Contribution |  |  |  |  |  |  |  |  | 75.0 | 64.4 | 52.2
Segment Income |  |  |  |  |  |  |  |  | 59.8 | 50.6 | 39.8
Assets | 206.6 |  |  |  | 199.5 |  |  |  | 206.6 | 199.5 | 191.4
Securities Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 196.2 | 151.7 | 175.2
Operating revenues |  |  |  |  |  |  |  |  | 196.2 | 151.7 | 175.2
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 94.6 | 94.6 | 121.9
Net Segment Contribution |  |  |  |  |  |  |  |  | 69.1 | 75.6 | 97.5
Segment Income |  |  |  |  |  |  |  |  | 40.8 | 46.6 | 69.4
Assets | 3,058.2 |  |  |  | 2,101.7 |  |  |  | 3,058.2 | 2,101.7 | 2,130.7
Physical Commodities Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 26,703.8 | 28,684.4 | 14,120.5
Operating revenues |  |  |  |  |  |  |  |  | 56.9 | 44.8 | 36.6
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 44.8 | 37.3 | 31.5
Net Segment Contribution |  |  |  |  |  |  |  |  | 31.8 | 27.2 | 23.4
Segment Income |  |  |  |  |  |  |  |  | 16.6 | (31.4) | 13.3
Assets | 413.7 |  |  |  | 339.5 |  |  |  | 413.7 | 339.5 | 258.0
Clearing and Execution Services Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 332.4 | 259.8 | 151.1
Operating revenues |  |  |  |  |  |  |  |  | 332.4 | 259.8 | 151.1
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 122.6 | 102.2 | 48.8
Net Segment Contribution |  |  |  |  |  |  |  |  | 91.8 | 78.0 | 39.5
Segment Income |  |  |  |  |  |  |  |  | 48.3 | 30.4 | 14.8
Assets | 2,109.9 |  |  |  | 1,818.9 |  |  |  | 2,109.9 | 1,818.9 | 1,617.4
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4.4 | (6.1) | (1.2)
Operating revenues |  |  |  |  |  |  |  |  | 4.4 | (6.1) | (1.2)
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | (0.3) | (16.4) | (11.8)
Assets | $ 100.6 |  |  |  | $ 133.5 |  |  |  | $ 100.6 | $ 133.5 | $ 115.3

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