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Other Expenses (Notes)
 6 Months Ended
Mar. 31, 2017
Other Expenses [Abstract]  
Other Expenses [Text Block]
Other Expenses
Other expenses for the three and six months ended March 31, 2017 and 2016 consisted of the following:
 
Three Months Ended March 31,
 
Six Months Ended March 31,
(in millions)
2017
 
2016
 
2017
 
2016
Contingent consideration, net
$
0.1

 
$
0.1

 
$
0.1

 
$
0.3

Insurance
0.8

 
0.3

 
1.3

 
0.7

Advertising, meetings and conferences
1.2

 
2.3

 
2.1

 
3.0

Non-trading hardware and software maintenance and software licensing
2.8

 
1.3

 
5.7

 
2.8

Office supplies and printing
0.5

 
0.3

 
1.1

 
0.6

Other clearing related expenses
0.3

 
0.3

 
0.7

 
0.5

Other non-income taxes
1.2

 
1.1

 
2.3

 
2.1

Other
2.5

 
1.7

 
4.6

 
3.7

Total other expenses
$
9.4

 
$
7.4

 
$
17.9

 
$
13.7