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Other Expenses (Notes)
 12 Months Ended
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).