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Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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 | Jun. 30, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total 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
Cost of sales of physical commodities | 12,177.4 | 5,308.3 | 5,265.0 | 5,888.9 | 2,599.0 | 4,693.5 | 3,542.8 | 3,248.6 |  | 28,639.6 | 14,083.9 | 34,068.9
Operating revenues | 205.1 | 197.6 | 195.8 | 185.5 | 178.6 | 175.0 | 166.1 | 151.3 |  | 784.0 | 671.0 | 624.3
Transaction-based clearing expenses | 35.1 | 33.9 | 33.7 | 33.6 | 32.0 | 35.2 | 32.9 | 29.8 |  | 136.3 | 129.9 | 122.7
Introducing broker commissions | 26.9 | 29.2 | 28.2 | 28.7 | 28.1 | 14.8 | 13.2 | 12.8 |  | 113.0 | 68.9 | 52.7
Interest expense | 12.0 | 11.2 | 10.0 | 8.9 | 7.5 | 7.7 | 7.1 | 6.0 |  | 42.1 | 28.3 | 17.1
Net operating revenues | 131.1 | 123.3 | 123.9 | 114.3 | 111.0 | 117.3 | 112.9 | 102.7 |  | 492.6 | 443.9 | 431.8
Compensation and benefits | 73.0 | 75.5 | 76.6 | 70.6 | 66.2 | 69.4 | 65.2 | 63.1 |  | 295.7 | 263.9 | 251.1
Bad debts | 0.4 | 0.1 | 1.3 | 2.5 | (0.2) | 0.0 | 2.6 | 2.0 |  | 4.3 | 4.4 | 7.3
Provision for bad debt on physical coal | 47.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |  | 47.0 | 0.0 | 0.0
Other | 33.2 | 32.7 | 31.7 | 32.8 | 32.0 | 26.5 | 25.1 | 25.5 |  | 37.5 | 29.4 | 23.5
Total compensation and other expenses | 153.6 | 108.3 | 109.6 | 105.9 | 98.0 | 95.9 | 92.9 | 90.6 |  | 477.4 | 377.4 | 353.7
Gain on acquisition |  |  |  |  | 6.2 | 0.0 | 0.0 | 0.0 |  | 0.0 | 6.2 | 0.0
Income before tax | (22.5) | 15.0 | 14.3 | 8.4 | 19.2 | 21.4 | 20.0 | 12.1 |  | 15.2 | 72.7 | 78.1
Income tax expense | 1.1 | 2.3 | 3.3 | 2.1 | 2.4 | 6.8 | 5.5 | 3.3 |  | 8.8 | 18.0 | 22.4
Net income | $ (23.6) | $ 12.7 | $ 11.0 | $ 6.3 | $ 16.8 | $ 14.6 | $ 14.5 | $ 8.8 |  | $ 6.4 | $ 54.7 | $ 55.7
Net basic earnings per share | $ (1.27) | $ 0.67 | $ 0.58 | $ 0.34 | $ 0.91 | $ 0.79 | $ 0.77 | $ 0.47 |  |  |  |
Net diluted earnings per share | $ (1.27) | $ 0.66 | $ 0.58 | $ 0.34 | $ 0.90 |  | $ 0.76 | $ 0.46 | $ 0.78 |  |  |

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