Other Expenses (Tables)

12 Months Ended

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).