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Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total 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
Cost of sales of physical commodities | 2,599.0 | 4,693.5 | 3,542.8 | 3,248.6 | 2,449.7 | 3,843.5 | 14,285.5 | 13,490.2 | 14,083.9 | 34,068.9 | 33,531.5
Operating revenues | 178.6 | 175.0 | 166.1 | 151.3 | 178.7 | 151.6 | 156.5 | 137.5 | 671.0 | 624.3 | 490.9
Transaction-based clearing expenses | 32.0 | 35.2 | 32.9 | 29.8 | 31.3 | 30.2 | 31.8 | 29.4 | 129.9 | 122.7 | 108.5
Introducing broker commissions | 28.1 | 14.8 | 13.2 | 12.8 | 15.1 | 13.1 | 12.3 | 12.2 | 68.9 | 52.7 | 49.9
Interest expense | 7.5 | 7.7 | 7.1 | 6.0 | 5.0 | 4.9 | 4.5 | 2.7 | 28.3 | 17.1 | 10.5
Net operating revenues | 111.0 | 117.3 | 112.9 | 102.7 | 127.3 | 103.4 | 107.9 | 93.2 | 443.9 | 431.8 | 322.0
Compensation and other expenses | 98.0 | 95.9 | 92.9 | 90.6 | 98.1 | 86.2 | 89.8 | 79.6 | 377.4 | 353.7 | 296.0
Gain on acquisition | 6.2 | 0.0 | 0.0 | 0.0 |  |  |  |  | 6.2 | 0.0 | 0.0
Income before tax | 19.2 | 21.4 | 20.0 | 12.1 | 29.2 | 17.2 | 18.1 | 13.6 | 72.7 | 78.1 | 26.0
Income tax expense | 2.4 | 6.8 | 5.5 | 3.3 | 8.1 | 5.0 | 5.1 | 4.2 | 18.0 | 22.4 | 6.4
Net income | $ 16.8 | $ 14.6 | $ 14.5 | $ 8.8 | $ 21.1 | $ 12.2 | $ 13.0 | $ 9.4 | $ 54.7 | $ 55.7 | $ 19.3
Net basic earnings per share | $ 0.91 | $ 0.79 | $ 0.77 | $ 0.47 | $ 1.12 | $ 0.64 | $ 0.68 | $ 0.50 | $ 2.94 | $ 2.94 | $ 1.01
Net diluted earnings per share | $ 0.90 | $ 0.78 | $ 0.76 | $ 0.46 | $ 1.09 | $ 0.62 | $ 0.67 | $ 0.49 | $ 2.90 | $ 2.87 | $ 0.98

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