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Segment and Geographic Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,777.6 | $ 4,868.5 | $ 3,708.9 | $ 3,399.9 | $ 2,628.4 | $ 3,995.1 | $ 14,442.0 | $ 13,627.7 | $ 14,754.9 | $ 34,693.2 | $ 34,022.4
Operating revenues | 178.6 | 175.0 | 166.1 | 151.3 | 178.7 | 151.6 | 156.5 | 137.5 | 671.0 | 624.3 | 490.9
Revenues, Net of Interest Expense | 111.0 | 117.3 | 112.9 | 102.7 | 127.3 | 103.4 | 107.9 | 93.2 | 443.9 | 431.8 | 322.0
Net Segment Contribution |  |  |  |  |  |  |  |  | 347.0 | 320.6 | 249.2
Segment Income |  |  |  |  |  |  |  |  | 206.0 | 188.1 | 128.8
Costs not allocated to operating segments |  |  |  |  |  |  |  |  | 133.3 | 110.0 | 102.8
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 19.2 | $ 21.4 | $ 20.0 | $ 12.1 | 29.2 | $ 17.2 | $ 18.1 | $ 13.6 | 72.7 | 78.1 | 26.0
Assets | 5,951.3 |  |  |  | 5,070.0 |  |  |  | 5,951.3 | 5,070.0 | 3,039.7
Commercial Hedging [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 236.1 | 262.4 | 224.0
Operating revenues |  |  |  |  |  |  |  |  | 236.1 | 262.4 | 224.0
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 188.2 | 214.7 | 180.5
Net Segment Contribution |  |  |  |  |  |  |  |  | 134.4 | 151.7 | 132.6
Segment Income |  |  |  |  |  |  |  |  | 68.7 | 85.6 | 67.3
Assets | 1,637.5 |  |  |  | 1,548.1 |  |  |  | 1,637.5 | 1,548.1 | 1,400.9
Global Payments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 73.2 | 77.1 | 55.4
Operating revenues |  |  |  |  |  |  |  |  | 73.2 | 77.1 | 55.4
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 65.3 | 68.5 | 48.2
Net Segment Contribution |  |  |  |  |  |  |  |  | 52.2 | 54.5 | 37.6
Segment Income |  |  |  |  |  |  |  |  | 39.8 | 43.3 | 28.3
Assets | 191.4 |  |  |  | 207.3 |  |  |  | 191.4 | 207.3 | 51.9
Securities Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 175.2 | 129.8 | 80.3
Operating revenues |  |  |  |  |  |  |  |  | 175.2 | 129.8 | 80.3
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 121.9 | 88.6 | 54.6
Net Segment Contribution |  |  |  |  |  |  |  |  | 97.5 | 67.4 | 40.9
Segment Income |  |  |  |  |  |  |  |  | 69.4 | 40.5 | 21.0
Assets | 2,130.7 |  |  |  | 1,861.0 |  |  |  | 2,130.7 | 1,861.0 | 235.5
Physical Commodities Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 14,120.5 | 34,092.0 | 33,552.1
Operating revenues |  |  |  |  |  |  |  |  | 36.6 | 23.1 | 20.6
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 31.5 | 21.2 | 17.9
Net Segment Contribution |  |  |  |  |  |  |  |  | 23.4 | 16.9 | 14.1
Segment Income |  |  |  |  |  |  |  |  | 13.3 | 5.8 | 5.9
Assets | 258.0 |  |  |  | 190.9 |  |  |  | 258.0 | 190.9 | 116.8
Clearing and Execution Services Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 151.1 | 123.4 | 113.7
Operating revenues |  |  |  |  |  |  |  |  | 151.1 | 123.4 | 113.7
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | 48.8 | 38.3 | 29.7
Net Segment Contribution |  |  |  |  |  |  |  |  | 39.5 | 30.1 | 24.0
Segment Income |  |  |  |  |  |  |  |  | 14.8 | 12.9 | 6.3
Assets | 1,617.4 |  |  |  | 1,163.8 |  |  |  | 1,617.4 | 1,163.8 | 1,136.2
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (1.2) | 8.5 | (3.1)
Operating revenues |  |  |  |  |  |  |  |  | (1.2) | 8.5 | (3.1)
Revenues, Net of Interest Expense |  |  |  |  |  |  |  |  | (11.8) | 0.5 | (8.9)
Assets | $ 116.3 |  |  |  | $ 98.9 |  |  |  | $ 116.3 | $ 98.9 | $ 98.4

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