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Segment and Geographic Information (Tables) | 12 Months Ended
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Sep. 30, 2018
Segment Analysis [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | Information concerning operations in these segments of business is shown in accordance with the Segment Reporting Topic of the ASC as follows:
| Year Ended September 30,
(in millions) | 2018 |  | 2017 |  | 2016
Total revenues: |  |  |  |  |
Commercial Hedging | $ | 286.7 |  |  | $ | 244.6 |  |  | $ | 236.1 |
Global Payments | 99.2 |  |  | 89.2 |  |  | 73.2 |
Securities | 196.2 |  |  | 151.7 |  |  | 175.2 |
Physical Commodities | 26,703.8 |  |  | 28,684.4 |  |  | 14,120.5 |
Clearing and Execution Services | 332.4 |  |  | 259.8 |  |  | 151.1 |
Corporate unallocated | 4.4 |  |  | (6.1 | ) |  | (1.2 | )
Total | $ | 27,622.7 |  |  | $ | 29,423.6 |  |  | $ | 14,754.9 |
Operating revenues (loss): |  |  |  |  |
Commercial Hedging | $ | 286.7 |  |  | $ | 244.6 |  |  | $ | 236.1 |
Global Payments | 99.2 |  |  | 89.2 |  |  | 73.2 |
Securities | 196.2 |  |  | 151.7 |  |  | 175.2 |
Physical Commodities | 56.9 |  |  | 44.8 |  |  | 36.6 |
Clearing and Execution Services | 332.4 |  |  | 259.8 |  |  | 151.1 |
Corporate unallocated | 4.4 |  |  | (6.1 | ) |  | (1.2 | )
Total | $ | 975.8 |  |  | $ | 784.0 |  |  | $ | 671.0 |
Net operating revenues (loss): |  |  |  |  |
Commercial Hedging | $ | 226.4 |  |  | $ | 194.3 |  |  | $ | 188.2 |
Global Payments | 93.5 |  |  | 80.6 |  |  | 65.3 |
Securities | 94.6 |  |  | 94.6 |  |  | 121.9 |
Physical Commodities | 44.8 |  |  | 37.3 |  |  | 31.5 |
Clearing and Execution Services | 122.6 |  |  | 102.2 |  |  | 48.8 |
Corporate unallocated | (0.3 | ) |  | (16.4 | ) |  | (11.8 | )
Total | $ | 581.6 |  |  | $ | 492.6 |  |  | $ | 443.9 |
Net contribution: |  |  |  |  |
(Revenues less cost of sales, transaction-based clearing expenses, variable bonus compensation, introducing broker commissions and interest expense): |  |  |  |  |
Commercial Hedging | $ | 164.7 |  |  | $ | 141.8 |  |  | $ | 134.4 |
Global Payments | 75.0 |  |  | 64.4 |  |  | 52.2 |
Securities | 69.1 |  |  | 75.6 |  |  | 97.5 |
Physical Commodities | 31.8 |  |  | 27.2 |  |  | 23.4 |
Clearing and Execution Services | 91.8 |  |  | 78.0 |  |  | 39.5 |
Total | $ | 432.4 |  |  | $ | 387.0 |  |  | $ | 347.0 |
Segment income (loss): |  |  |  |  |
(Net contribution less non-variable direct segment costs): |  |  |  |  |
Commercial Hedging | $ | 96.4 |  |  | $ | 72.8 |  |  | $ | 68.7 |
Global Payments | 59.8 |  |  | 50.6 |  |  | 39.8 |
Securities | 40.8 |  |  | 46.6 |  |  | 69.4 |
Physical Commodities (1) | 16.6 |  |  | (31.4 | ) |  | 13.3 |
Clearing and Execution Services | 48.3 |  |  | 30.4 |  |  | 14.8 |
Total | $ | 261.9 |  |  | $ | 169.0 |  |  | $ | 206.0 |
Reconciliation of segment income to income before tax: |  |  |  |  |
Segment income | $ | 261.9 |  |  | $ | 169.0 |  |  | $ | 206.0 |
Costs not allocated to operating segments (2) | 162.4 |  |  | 153.8 |  |  | 139.5 |
Other gains | 2.0 |  |  | — |  |  | 6.2 |
Income before tax | $ | 101.5 |  |  | $ | 15.2 |  |  | $ | 72.7 |
(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. (2) The costs not allocated to operating segments include certain shared services such as information technology, accounting and treasury, credit and risk, legal and compliance, and human resources and other activities.
(in millions) | As of September 30, 2018 |  | As of September 30, 2017 |  | As of September 30, 2016
Total assets: |  |  |  |  |
Commercial Hedging | $ | 1,935.7 |  |  | $ | 1,650.3 |  |  | $ | 1,637.5 |
Global Payments | 206.6 |  |  | 199.5 |  |  | 191.4 |
Securities | 3,058.2 |  |  | 2,101.7 |  |  | 2,130.7 |
Physical Commodities | 413.7 |  |  | 339.5 |  |  | 258.0 |
Clearing and Execution Services | 2,109.9 |  |  | 1,818.9 |  |  | 1,617.4 |
Corporate unallocated | 100.6 |  |  | 133.5 |  |  | 115.3 |
Total | $ | 7,824.7 |  |  | $ | 6,243.4 |  |  | $ | 5,950.3 |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] | Information regarding revenues and operating revenues for the years ended September 30, 2018, 2017, and 2016, and information regarding long-lived assets (defined as property, equipment, leasehold improvements and software) as of September 30, 2018, 2017, and 2016 in geographic areas were as follows:
| Year Ended September 30,
(in millions) | 2018 |  | 2017 |  | 2016
Total revenues: |  |  |  |  |
United States | $ | 1,587.6 |  |  | $ | 1,168.0 |  |  | $ | 817.1 |
Europe | 189.6 |  |  | 166.9 |  |  | 463.5 |
South America | 59.5 |  |  | 53.9 |  |  | 64.8 |
Asia | 25,781.4 |  |  | 28,030.3 |  |  | 13,405.1 |
Other | 4.6 |  |  | 4.5 |  |  | 4.4 |
Total | $ | 27,622.7 |  |  | $ | 29,423.6 |  |  | $ | 14,754.9 |
Operating revenues: |  |  |  |  |
United States | $ | 695.3 |  |  | $ | 529.4 |  |  | $ | 457.0 |
Europe | 189.0 |  |  | 166.9 |  |  | 120.2 |
South America | 58.0 |  |  | 54.0 |  |  | 64.8 |
Asia | 28.9 |  |  | 29.2 |  |  | 24.6 |
Other | 4.6 |  |  | 4.5 |  |  | 4.4 |
Total | $ | 975.8 |  |  | $ | 784.0 |  |  | $ | 671.0 |
(in millions) | As of September 30, 2018 |  | As of September 30, 2017 |  | As of September 30, 2016
Long-lived assets, as defined: |  |  |  |  |
United States | $ | 33.0 |  |  | $ | 29.7 |  |  | $ | 23.3 |
Europe | 6.8 |  |  | 7.3 |  |  | 4.8 |
South America | 1.4 |  |  | 1.5 |  |  | 1.2 |
Asia | 1.2 |  |  | 0.2 |  |  | 0.1 |
Total | $ | 42.4 |  |  | $ | 38.7 |  |  | $ | 29.4 |

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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