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Other Expenses (Notes)
 12 Months Ended
Sep. 30, 2015
Other Expenses [Abstract]  
Other Expenses [Text Block]
Other Expenses
Other expenses for the years ended September 30, 2015, 2014, and 2013 are comprised of the following:
 
Year Ended September 30,
(in millions)
2015
 
2014
 
2013
Contingent consideration, net(1)
1.8

 
(2.0
)
 
3.0

Insurance
1.7

 
1.6

 
1.7

Advertising, meetings and conferences
2.7

 
3.1

 
2.3

Non-trading hardware and software maintenance and software licensing
4.7

 
3.8

 
2.8

Office supplies and printing
1.2

 
1.1

 
1.2

Other clearing related expenses
1.1

 
1.2

 
1.6

Other non-income taxes
3.7

 
3.9

 
3.8

Other
6.6

 
5.7

 
6.7

Total other expenses
$
23.5

 
$
18.4

 
$
23.1

(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 3).