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Quarterly Financial Information (Unaudited) (Notes) | 12 Months Ended
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Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Text Block] | Quarterly Financial Information (Unaudited) The Company has set forth certain quarterly unaudited financial data for the past two years in the tables below:
| For the 2018 Fiscal Quarter Ended
(in millions, except per share amounts) | September 30(1) |  | June 30 |  | March 31 |  | December 31
Total revenues | $ | 6,078.8 |  |  | $ | 7,118.3 |  |  | $ | 6,507.0 |  |  | $ | 7,918.6 |
Cost of sales of physical commodities | 5,835.6 |  |  | 6,858.5 |  |  | 6,246.8 |  |  | 7,706.0 |
Operating revenues | 243.2 |  |  | 259.8 |  |  | 260.2 |  |  | 212.6 |
Transaction-based clearing expenses | 43.1 |  |  | 49.0 |  |  | 50.7 |  |  | 36.9 |
Introducing broker commissions | 32.4 |  |  | 34.1 |  |  | 36.2 |  |  | 31.1 |
Interest expense | 25.3 |  |  | 22.1 |  |  | 19.0 |  |  | 14.3 |
Net operating revenues | 142.4 |  |  | 154.6 |  |  | 154.3 |  |  | 130.3 |
Compensation and benefits | 85.4 |  |  | 86.9 |  |  | 88.2 |  |  | 77.2 |
Bad debts | 1.2 |  |  | 1.6 |  |  | 0.2 |  |  | 0.1 |
Bad debt on physical coal (1) | — |  |  | — |  |  | — |  |  | 1.0 |
Other expenses | 35.3 |  |  | 35.2 |  |  | 36.4 |  |  | 33.4 |
Total compensation and other expenses | 121.9 |  |  | 123.7 |  |  | 124.8 |  |  | 111.7 |
Other gain | — |  |  | 2.0 |  |  | — |  |  | — |
Income before tax | 20.5 |  |  | 32.9 |  |  | 29.5 |  |  | 18.6 |
Income tax expense | 4.8 |  |  | 8.9 |  |  | 6.8 |  |  | 25.5 |
Net income (loss) | $ | 15.7 |  |  | $ | 24.0 |  |  | $ | 22.7 |  |  | $ | (6.9 | )
Net basic earnings (loss) per share | $ | 0.83 |  |  | $ | 1.27 |  |  | $ | 1.20 |  |  | $ | (0.37 | )
Net diluted earnings (loss) per share | $ | 0.81 |  |  | $ | 1.25 |  |  | $ | 1.18 |  |  | $ | (0.37 | )
| For the 2017 Fiscal Quarter Ended
(in millions, except per share amounts) | September 30 |  | June 30 |  | March 31 |  | December 31
Total revenues | $ | 12,382.5 |  |  | $ | 5,505.9 |  |  | $ | 5,460.8 |  |  | $ | 6,074.4 |
Cost of sales of physical commodities | 12,177.4 |  |  | 5,308.3 |  |  | 5,265.0 |  |  | 5,888.9 |
Operating revenues | 205.1 |  |  | 197.6 |  |  | 195.8 |  |  | 185.5 |
Transaction-based clearing expenses | 35.1 |  |  | 33.9 |  |  | 33.7 |  |  | 33.6 |
Introducing broker commissions | 26.9 |  |  | 29.2 |  |  | 28.2 |  |  | 28.7 |
Interest expense | 12.0 |  |  | 11.2 |  |  | 10.0 |  |  | 8.9 |
Net operating revenues | 131.1 |  |  | 123.3 |  |  | 123.9 |  |  | 114.3 |
Compensation and benefits | 73.0 |  |  | 75.5 |  |  | 76.6 |  |  | 70.6 |
Bad debts | 0.4 |  |  | 0.1 |  |  | 1.3 |  |  | 2.5 |
Bad debt on physical coal (1) | 47.0 |  |  | — |  |  | — |  |  | — |
Other expenses | 33.2 |  |  | 32.7 |  |  | 31.7 |  |  | 32.8 |
Total compensation and other expenses | 153.6 |  |  | 108.3 |  |  | 109.6 |  |  | 105.9 |
Income before tax | (22.5 | ) |  | 15.0 |  |  | 14.3 |  |  | 8.4 |
Income tax expense | 1.1 |  |  | 2.3 |  |  | 3.3 |  |  | 2.1 |
Net income | $ | (23.6 | ) |  | $ | 12.7 |  |  | $ | 11.0 |  |  | $ | 6.3 |
Net basic (loss) earnings per share | $ | (1.27 | ) |  | $ | 0.67 |  |  | $ | 0.58 |  |  | $ | 0.34 |
Net diluted (loss) earnings per share | $ | (1.27 | ) |  | $ | 0.66 |  |  | $ | 0.58 |  |  | $ | 0.34 |
(1) During the first quarter of fiscal 2018 and the fourth quarter of fiscal 2017, the Company recorded charges to earnings of $1.0 million and $47.0 million, respectively, to record an allowance for doubtful accounts related to a bad debt incurred in the physical coal business conducted solely in INTL Asia Pte. Ltd., with a coal supplier, as further discussed in Note 17.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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