Condensed Consolidated Income Statements - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Sales of physical commodities	$ 3,548.0	$ 14,291.6	$ 6,800.6	$ 27,785.9
Trading gains, net	80.7	84.8	160.4	155.1
Commission and clearing fees	52.1	47.2	101.2	96.7
Consulting and management fees	9.6	9.3	19.3	19.7
Interest income	18.5	9.0	27.2	12.1
Other income	0.0	0.1	0.1	0.2
Total revenues	3,708.9	14,442.0	7,108.8	28,069.7
Cost of sales of physical commodities	3,542.8	14,285.5	6,791.4	27,775.7
Operating revenues	166.1	156.5	317.4	294.0
Transaction-based clearing expenses	32.9	31.8	62.7	61.2
Introducing broker commissions	13.2	12.3	26.0	24.5
Interest expense	7.1	4.5	13.1	7.2
Net operating revenues	112.9	107.9	215.6	201.1
Compensation and other expenses:
Compensation and benefits	65.2	63.1	128.3	119.5
Communication and data services	7.3	7.2	15.2	13.9
Occupancy and equipment rental	3.2	3.8	6.5	6.9
Professional fees	2.7	3.1	5.6	6.4
Travel and business development	2.3	2.5	5.5	5.3
Depreciation and amortization	2.2	1.8	4.1	3.7
Bad debts	2.6	2.8	4.6	2.8
Other	7.4	5.5	13.7	10.9
Total compensation and other expenses	92.9	89.8	183.5	169.4
Income before tax	20.0	18.1	32.1	31.7
Income tax expense	5.5	5.1	8.8	9.3
Net income	$ 14.5	$ 13.0	$ 23.3	$ 22.4
Earnings per share:
Basic	$ 0.77	$ 0.68	$ 1.24	$ 1.18
Diluted	$ 0.76	$ 0.67	$ 1.22	$ 1.16
Weighted-average number of common shares outstanding:
Basic	18,592,643	18,599,011	18,621,337	18,546,377
Diluted	18,755,450	18,957,780	18,821,822	18,743,033