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Segment and Geographic Information (Tables) | 12 Months Ended
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Sep. 30, 2019
Segment Analysis [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
(in millions) | As of September 30, 2019 |  | As of September 30, 2018 |  | As of September 30, 2017
Total assets: |  |  |  |  |
Commercial Hedging | $ | 2,041.0 |  |  | $ | 1,935.7 |  |  | $ | 1,650.3 |
Global Payments | 278.3 |  |  | 206.6 |  |  | 199.5 |
Securities | 5,219.1 |  |  | 3,058.2 |  |  | 2,101.7 |
Physical Commodities | 357.8 |  |  | 413.7 |  |  | 339.5 |
Clearing and Execution Services | 1,892.1 |  |  | 2,109.9 |  |  | 1,818.9 |
Corporate unallocated | 147.8 |  |  | 100.6 |  |  | 133.5 |
Total | $ | 9,936.1 |  |  | $ | 7,824.7 |  |  | $ | 6,243.4 |
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, 2019, 2018, and 2017, and information regarding long-lived assets (defined as property, equipment, leasehold improvements and software) as of September 30, 2019, 2018, and 2017 in geographic areas were as follows:
| Year Ended September 30,
(in millions) | 2019 |  | 2018 |  | 2017
Total revenues: |  |  |  |  |
United States | $ | 1,947.6 |  |  | $ | 1,587.6 |  |  | $ | 1,168.0 |
Europe | 280.2 |  |  | 189.6 |  |  | 166.9 |
South America | 56.5 |  |  | 59.5 |  |  | 53.9 |
Middle East and Asia | 30,606.9 |  |  | 25,781.4 |  |  | 28,030.3 |
Other | 5.8 |  |  | 4.6 |  |  | 4.5 |
Total | $ | 32,897.0 |  |  | $ | 27,622.7 |  |  | $ | 29,423.6 |
Operating revenues: |  |  |  |  |
United States | $ | 799.4 |  |  | $ | 695.3 |  |  | $ | 529.4 |
Europe | 209.6 |  |  | 189.0 |  |  | 166.9 |
South America | 56.5 |  |  | 58.0 |  |  | 54.0 |
Middle East and Asia | 34.8 |  |  | 28.9 |  |  | 29.2 |
Other | 5.8 |  |  | 4.6 |  |  | 4.5 |
Total | $ | 1,106.1 |  |  | $ | 975.8 |  |  | $ | 784.0 |
(in millions) | As of September 30, 2019 |  | As of September 30, 2018 |  | As of September 30, 2017
Long-lived assets, as defined: |  |  |  |  |
United States | $ | 33.9 |  |  | $ | 33.0 |  |  | $ | 29.7 |
Europe | 6.6 |  |  | 6.8 |  |  | 7.3 |
South America | 2.1 |  |  | 1.4 |  |  | 1.5 |
Middle East and Asia | 1.0 |  |  | 1.2 |  |  | 0.2 |
Other | 0.3 |  |  | — |  |  | — |
Total | $ | 43.9 |  |  | $ | 42.4 |  |  | $ | 38.7 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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