Condensed Consolidated Income Statements - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Sales of physical commodities	$ 5,273.3	$ 3,548.0	$ 11,169.3	$ 6,800.6
Trading gains, net	84.0	80.7	167.0	160.4
Commission and clearing fees	70.3	52.1	139.5	101.2
Consulting and management fees	15.5	9.6	31.2	19.3
Interest income	17.7	18.5	28.1	27.2
Other income	0.0	0.0	0.1	0.1
Total revenues	5,460.8	3,708.9	11,535.2	7,108.8
Cost of sales of physical commodities	5,265.0	3,542.8	11,153.9	6,791.4
Operating revenues	195.8	166.1	381.3	317.4
Transaction-based clearing expenses	33.7	32.9	67.3	62.7
Introducing broker commissions	28.2	13.2	56.9	26.0
Interest expense	10.0	7.1	18.9	13.1
Net operating revenues	123.9	112.9	238.2	215.6
Compensation and other expenses:
Compensation and benefits	76.6	65.2	147.2	128.3
Communication and data services	9.7	7.3	19.8	15.2
Occupancy and equipment rental	3.8	3.2	7.2	6.5
Professional fees	3.4	2.7	8.2	5.6
Travel and business development	3.0	2.3	6.6	5.5
Depreciation and amortization	2.4	2.2	4.8	4.1
Bad debts	1.3	2.6	3.8	4.6
Other	9.4	7.4	17.9	13.7
Total compensation and other expenses	109.6	92.9	215.5	183.5
Income before tax	14.3	20.0	22.7	32.1
Income tax expense	3.3	5.5	5.4	8.8
Net income	$ 11.0	$ 14.5	$ 17.3	$ 23.3
Earnings per share:
Basic	$ 0.58	$ 0.77	$ 0.92	$ 1.24
Diluted	$ 0.58	$ 0.76	$ 0.92	$ 1.22
Weighted-average number of common shares outstanding:
Basic	18,404,236	18,592,643	18,325,383	18,621,337
Diluted	18,661,418	18,755,450	18,637,480	18,821,822