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Other Expenses (Notes) | 12 Months Ended
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Sep. 30, 2017
Other Expenses [Abstract] |
Other Expenses [Text Block] | Other Expenses 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 The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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