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Other Expenses (Tables) | 12 Months Ended
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Sep. 30, 2017
Other Expenses [Abstract] |
Schedule of Other Operating Cost and Expense, by Component [Table Text Block] | Other expenses for the years ended September 30, 2017, 2016, and 2015 are comprised of the following:
| Year Ended September 30,
(in millions) | 2017 |  | 2016 |  | 2015
Contingent consideration, net(1) | 0.1 |  |  | 0.4 |  |  | 1.8 |
Insurance | 2.7 |  |  | 2.1 |  |  | 1.7 |
Advertising, meetings and conferences | 4.0 |  |  | 5.1 |  |  | 2.7 |
Non-trading hardware and software maintenance and software licensing | 11.6 |  |  | 7.1 |  |  | 4.7 |
Office supplies and printing | 2.1 |  |  | 1.1 |  |  | 1.2 |
Other clearing related expenses | 2.6 |  |  | 1.3 |  |  | 1.1 |
Other non-income taxes | 4.6 |  |  | 4.3 |  |  | 3.7 |
Other | 9.8 |  |  | 8.0 |  |  | 6.6 |
Total other expenses | $ | 37.5 |  |  | $ | 29.4 |  |  | $ | 23.5 |
(1) Contingent consideration includes remeasurement of contingent liabilities related to business combinations accounted for in accordance with the provisions of the Business Combinations Topic of the ASC (see Note 4).

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- Definition Tabular disclosure of each detailed component of other operating costs and expenses that are applicable to sales and revenues, but not included in the cost of sales in the income statement. + 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 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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