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Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total 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
Cost of sales of physical commodities | 5,835.6 | 6,858.5 | 6,246.8 | 7,706.0 | 12,177.4 | 5,308.3 | 5,265.0 | 5,888.9 | 26,646.9 | 28,639.6 | 14,083.9
Operating revenues | 243.2 | 259.8 | 260.2 | 212.6 | 205.1 | 197.6 | 195.8 | 185.5 | 975.8 | 784.0 | 671.0
Transaction-based clearing expenses | 43.1 | 49.0 | 50.7 | 36.9 | 35.1 | 33.9 | 33.7 | 33.6 | 179.7 | 136.3 | 129.9
Introducing broker commissions | 32.4 | 34.1 | 36.2 | 31.1 | 26.9 | 29.2 | 28.2 | 28.7 | 133.8 | 113.0 | 68.9
Interest expense | 25.3 | 22.1 | 19.0 | 14.3 | 12.0 | 11.2 | 10.0 | 8.9 | 80.7 | 42.1 | 28.3
Net operating revenues | 142.4 | 154.6 | 154.3 | 130.3 | 131.1 | 123.3 | 123.9 | 114.3 | 581.6 | 492.6 | 443.9
Compensation and benefits | 85.4 | 86.9 | 88.2 | 77.2 | 73.0 | 75.5 | 76.6 | 70.6 | 337.7 | 295.7 | 263.9
Bad debts | 1.2 | 1.6 | 0.2 | 0.1 | 0.4 | 0.1 | 1.3 | 2.5 | 3.1 | 4.3 | 4.4
Bad debt on physical coal | 0.0 | 0.0 | 0.0 | 1.0 |  |  |  |  | 1.0 | 47.0 | 0.0
Other | 35.3 | 35.2 | 36.4 | 33.4 | 33.2 | 32.7 | 31.7 | 32.8 | 26.3 | 25.9 | 22.3
Total compensation and other expenses | 121.9 | 123.7 | 124.8 | 111.7 | 153.6 | 108.3 | 109.6 | 105.9 | 482.1 | 477.4 | 377.4
Income before tax | 20.5 | 32.9 | 29.5 | 18.6 | (22.5) | 15.0 | 14.3 | 8.4 | 101.5 | 15.2 | 72.7
Income tax expense | 4.8 | 8.9 | 6.8 | 25.5 | 1.1 | 2.3 | 3.3 | 2.1 | 46.0 | 8.8 | 18.0
Net income | $ 15.7 | $ 24.0 | $ 22.7 | $ (6.9) | $ (23.6) | $ 12.7 | $ 11.0 | $ 6.3 | $ 55.5 | $ 6.4 | $ 54.7
Net basic earnings per share | $ 0.83 | $ 1.27 | $ 1.20 | $ (0.37) | $ (1.27) | $ 0.67 | $ 0.58 | $ 0.34 |  |  |
Net diluted earnings per share | $ 0.81 | $ 1.25 | $ 1.18 | $ (0.37) | $ (1.27) | $ 0.66 | $ 0.58 | $ 0.34 |  |  |

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