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Segment Analysis (Tables) | 9 Months Ended
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Jun. 30, 2017
Segment Analysis [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | Information for the reportable segments is shown in accordance with the Segment Reporting Topic of the ASC as follows:
| Three Months Ended June 30, |  | Nine Months Ended June 30,
(in millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Total revenues: |  |  |  |  |  |  |
Commercial Hedging | $ | 57.1 |  |  | $ | 71.9 |  |  | $ | 177.3 |  |  | $ | 182.0 |
Global Payments | 22.5 |  |  | 18.4 |  |  | 67.1 |  |  | 54.1 |
Securities | 40.0 |  |  | 41.6 |  |  | 115.3 |  |  | 136.0 |
Physical Commodities | 5,320.3 |  |  | 4,701.2 |  |  | 16,495.2 |  |  | 11,506.4 |
Clearing and Execution Services | 65.4 |  |  | 33.3 |  |  | 193.2 |  |  | 96.4 |
Corporate unallocated | 0.6 |  |  | 2.1 |  |  | (7.0 | ) |  | 2.4 |
Total | $ | 5,505.9 |  |  | $ | 4,868.5 |  |  | $ | 17,041.1 |  |  | $ | 11,977.3 |
Operating revenues (loss): |  |  |  |  |  |  |
Commercial Hedging | $ | 57.1 |  |  | $ | 71.9 |  |  | $ | 177.3 |  |  | $ | 182.0 |
Global Payments | 22.5 |  |  | 18.4 |  |  | 67.1 |  |  | 54.1 |
Securities | 40.0 |  |  | 41.6 |  |  | 115.3 |  |  | 136.0 |
Physical Commodities | 12.0 |  |  | 7.7 |  |  | 33.0 |  |  | 21.5 |
Clearing and Execution Services | 65.4 |  |  | 33.3 |  |  | 193.2 |  |  | 96.4 |
Corporate unallocated | 0.6 |  |  | 2.1 |  |  | (7.0 | ) |  | 2.4 |
Total | $ | 197.6 |  |  | $ | 175.0 |  |  | $ | 578.9 |  |  | $ | 492.4 |
Net operating revenues (loss): |  |  |  |  |  |  |
Commercial Hedging | $ | 44.2 |  |  | $ | 57.7 |  |  | $ | 140.3 |  |  | $ | 145.6 |
Global Payments | 20.3 |  |  | 16.4 |  |  | 60.0 |  |  | 48.2 |
Securities | 24.6 |  |  | 27.7 |  |  | 73.8 |  |  | 95.5 |
Physical Commodities | 10.2 |  |  | 6.2 |  |  | 27.3 |  |  | 17.7 |
Clearing and Execution Services | 25.6 |  |  | 10.0 |  |  | 75.1 |  |  | 30.8 |
Corporate unallocated | (1.6 | ) |  | (0.7 | ) |  | (15.0 | ) |  | (4.9 | )
Total | $ | 123.3 |  |  | $ | 117.3 |  |  | $ | 361.5 |  |  | $ | 332.9 |
Net contribution: |  |  |  |  |  |  |
(Revenues less cost of sales of physical commodities, transaction-based clearing expenses, variable bonus compensation, introducing broker commissions and interest expense) |  |  |  |
Commercial Hedging | $ | 32.6 |  |  | $ | 41.4 |  |  | $ | 102.9 |  |  | $ | 103.6 |
Global Payments | 16.2 |  |  | 13.2 |  |  | 47.9 |  |  | 38.6 |
Securities | 20.2 |  |  | 21.2 |  |  | 58.9 |  |  | 75.7 |
Physical Commodities | 7.6 |  |  | 3.6 |  |  | 19.9 |  |  | 12.3 |
Clearing and Execution Services | 19.1 |  |  | 8.0 |  |  | 56.7 |  |  | 24.1 |
Total | $ | 95.7 |  |  | $ | 87.4 |  |  | $ | 286.3 |  |  | $ | 254.3 |
Segment income: |  |  |  |  |  |  |
(Net contribution less non-variable direct segment costs) |  |  |  |  |  |  |
Commercial Hedging | $ | 16.3 |  |  | $ | 25.4 |  |  | $ | 50.4 |  |  | $ | 54.2 |
Global Payments | 12.9 |  |  | 9.9 |  |  | 37.8 |  |  | 29.2 |
Securities | 12.9 |  |  | 14.4 |  |  | 37.5 |  |  | 54.5 |
Physical Commodities | 4.3 |  |  | 1.3 |  |  | 11.2 |  |  | 4.2 |
Clearing and Execution Services | 6.5 |  |  | 3.4 |  |  | 20.1 |  |  | 10.4 |
Total | $ | 52.9 |  |  | $ | 54.4 |  |  | $ | 157.0 |  |  | $ | 152.5 |
Reconciliation of segment income to income before tax: |  |  |  |
Segment income | $ | 52.9 |  |  | $ | 54.4 |  |  | $ | 157.0 |  |  | $ | 152.5 |
Net costs not allocated to operating segments | 37.9 |  |  | 33.0 |  |  | 119.3 |  |  | 99.0 |
Income before tax | $ | 15.0 |  |  | $ | 21.4 |  |  | $ | 37.7 |  |  | $ | 53.5 |
(in millions) |  |  |  |  | As of June 30, 2017 |  | As of September 30, 2016
Total assets: |  |  |  |  |  |  |
Commercial Hedging |  |  |  |  | $ | 1,591.0 |  |  | $ | 1,637.5 |
Global Payments |  |  |  |  | 257.2 |  |  | 191.4 |
Securities |  |  |  |  | 2,300.7 |  |  | 2,130.7 |
Physical Commodities |  |  |  |  | 304.2 |  |  | 258.0 |
Clearing and Execution Services |  |  |  |  | 1,590.5 |  |  | 1,617.4 |
Corporate unallocated |  |  |  |  | 152.3 |  |  | 115.3 |
Total |  |  |  |  | $ | 6,195.9 |  |  | $ | 5,950.3 |

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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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