Condensed Consolidated Income Statements - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Sales of physical commodities	$ 6,255.8	$ 5,273.3	$ 13,970.2	$ 11,169.3
Trading gains, net	107.7	84.0	193.5	167.0
Commission and clearing fees	97.2	70.3	175.0	139.5
Consulting,management, and account fees	18.3	15.5	34.9	31.2
Interest income	27.9	17.7	51.9	28.1
Other income	0.1	0.0	0.1	0.1
Total revenues	6,507.0	5,460.8	14,425.6	11,535.2
Cost of sales of physical commodities	6,246.8	5,265.0	13,952.8	11,153.9
Operating revenues	260.2	195.8	472.8	381.3
Transaction-based clearing expenses	50.7	33.7	87.6	67.3
Introducing broker commissions	36.2	28.2	67.3	56.9
Interest expense	19.0	10.0	33.3	18.9
Net operating revenues	154.3	123.9	284.6	238.2
Compensation and other expenses:
Compensation and benefits	88.2	76.6	165.4	147.2
Trading systems and market information	8.9	8.5	17.1	17.4
Occupancy and equipment rental	4.2	3.8	8.3	7.2
Professional fees	3.9	3.4	8.6	8.2
Travel and business development	3.0	3.0	6.5	6.6
Non-trading technology and support	3.4	2.8	6.5	5.7
Depreciation and amortization	2.9	2.4	5.6	4.8
Communications	1.4	1.2	2.8	2.4
Bad debts	0.2	1.3	1.3	3.8
Other	8.7	6.6	14.4	12.2
Total compensation and other expenses	124.8	109.6	236.5	215.5
Income before tax	29.5	14.3	48.1	22.7
Income tax expense	6.8	3.3	32.3	5.4
Net income	$ 22.7	$ 11.0	$ 15.8	$ 17.3
Earnings per share:
Basic	$ 1.20	$ 0.58	$ 0.83	$ 0.92
Diluted	$ 1.18	$ 0.58	$ 0.81	$ 0.92
Weighted-average number of common shares outstanding:
Basic	18,559,849	18,404,236	18,502,795	18,325,383
Diluted	18,859,333	18,661,418	18,836,213	18,637,480