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Segment and Geographic Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 12,382.5 | $ 5,505.9 | $ 5,460.8 | $ 6,074.4 | $ 2,777.6 | $ 4,868.5 | $ 3,708.9 | $ 3,399.9 | $ 29,423.6 | $ 14,754.9 | $ 34,693.2
Operating revenues | 205.1 | 197.6 | 195.8 | 185.5 | 178.6 | 175.0 | 166.1 | 151.3 | 784.0 | 671.0 | 624.3
Revenues, Net of Interest Expense | 131.1 | 123.3 | 123.9 | 114.3 | 111.0 | 117.3 | 112.9 | 102.7 | 492.6 | 443.9 | 431.8
Net Segment Contribution |  |  |  |  |  |  |  |  | 387.0 | 347.0 | 320.6
Segment Income |  |  |  |  |  |  |  |  | 169.0 | 206.0 | 188.1
Costs not allocated to operating segments |  |  |  |  |  |  |  |  | 153.8 | 133.3 | 110.0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (22.5) | $ 15.0 | $ 14.3 | $ 8.4 | 19.2 | $ 21.4 | $ 20.0 | $ 12.1 | 15.2 | 72.7 | 78.1
Assets | 6,243.4 |  |  |  | 5,950.3 |  |  |  | 6,243.4 | 5,950.3 | 5,070.0
Commercial Hedging [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 244.6 | 236.1 | 262.4
Operating revenues |  |  |  |  |  |  |  |  | 244.6 | 236.1 | 262.4
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 194.3 | 188.2 | 214.7
Net Segment Contribution |  |  |  |  |  |  |  |  | 141.8 | 134.4 | 151.7
Segment Income |  |  |  |  |  |  |  |  | 72.8 | 68.7 | 85.6
Assets | 1,650.3 |  |  |  | 1,637.5 |  |  |  | 1,650.3 | 1,637.5 | 1,548.1
Global Payments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 89.2 | 73.2 | 77.1
Operating revenues |  |  |  |  |  |  |  |  | 89.2 | 73.2 | 77.1
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 80.6 | 65.3 | 68.5
Net Segment Contribution |  |  |  |  |  |  |  |  | 64.4 | 52.2 | 54.5
Segment Income |  |  |  |  |  |  |  |  | 50.6 | 39.8 | 43.3
Assets | 199.5 |  |  |  | 191.4 |  |  |  | 199.5 | 191.4 | 207.3
Securities Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 151.7 | 175.2 | 129.8
Operating revenues |  |  |  |  |  |  |  |  | 151.7 | 175.2 | 129.8
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 94.6 | 121.9 | 88.6
Net Segment Contribution |  |  |  |  |  |  |  |  | 75.6 | 97.5 | 67.4
Segment Income |  |  |  |  |  |  |  |  | 46.6 | 69.4 | 40.5
Assets | 2,101.7 |  |  |  | 2,130.7 |  |  |  | 2,101.7 | 2,130.7 | 1,861.0
Physical Commodities Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 28,684.4 | 14,120.5 | 34,092.0
Operating revenues |  |  |  |  |  |  |  |  | 44.8 | 36.6 | 23.1
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 37.3 | 31.5 | 21.2
Net Segment Contribution |  |  |  |  |  |  |  |  | 27.2 | 23.4 | 16.9
Segment Income |  |  |  |  |  |  |  |  | (31.4) | 13.3 | 5.8
Assets | 339.5 |  |  |  | 258.0 |  |  |  | 339.5 | 258.0 | 190.9
Clearing and Execution Services Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 259.8 | 151.1 | 123.4
Operating revenues |  |  |  |  |  |  |  |  | 259.8 | 151.1 | 123.4
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 102.2 | 48.8 | 38.3
Net Segment Contribution |  |  |  |  |  |  |  |  | 78.0 | 39.5 | 30.1
Segment Income |  |  |  |  |  |  |  |  | 30.4 | 14.8 | 12.9
Assets | 1,818.9 |  |  |  | 1,617.4 |  |  |  | 1,818.9 | 1,617.4 | 1,163.8
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (6.1) | (1.2) | 8.5
Operating revenues |  |  |  |  |  |  |  |  | (6.1) | (1.2) | 8.5
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | (16.4) | (11.8) | 0.5
Assets | $ 133.5 |  |  |  | $ 115.3 |  |  |  | $ 133.5 | $ 115.3 | $ 98.9

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