Condensed Consolidated Income Statements - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Sales of physical commodities	$ 7,944.5	$ 7,599.3	$ 38,939.4	$ 20,824.6
Principal gains, net	161.0	102.3	442.0	305.4
Commission and clearing fees	96.1	97.5	299.9	282.1
Consulting, management, and account fees	19.4	20.7	63.3	58.9
Interest income	22.4	53.2	110.1	146.4
Total revenues	8,243.4	7,873.0	39,854.7	21,617.4
Cost of sales of physical commodities	7,920.8	7,589.6	38,888.5	20,798.2
Operating revenues	322.6	283.4	966.2	819.2
Transaction-based clearing expenses	55.3	45.7	165.4	138.5
Introducing broker commissions	24.0	29.6	79.8	87.0
Interest expense	15.4	42.5	79.2	113.9
Net operating revenues	227.9	165.6	641.8	479.8
Compensation and other expenses:
Compensation and benefits	132.5	100.9	373.2	287.9
Trading systems and market information	11.8	9.8	33.4	28.5
Occupancy and equipment rental	5.4	5.0	15.3	14.4
Professional fees	6.1	5.8	16.8	16.1
Travel and business development	0.7	4.0	8.4	11.8
Non-trading technology and support	6.9	5.8	18.8	15.0
Depreciation and amortization	4.4	3.5	12.5	9.6
Communications	1.7	1.6	4.8	4.9
Bad debts	1.8	0.5	6.2	1.5
Recovery of bad debt on physical coal	0.0	0.0	0.0	(2.4)
Other	7.6	7.1	25.7	21.0
Total compensation and other expenses	178.9	144.0	515.1	408.3
Other gain	0.0	0.0	0.1	5.4
Income before tax	49.0	21.6	126.8	76.9
Income tax expense	12.4	5.3	34.6	19.0
Net income	$ 36.6	$ 16.3	$ 92.2	$ 57.9
Earnings per share:
Basic	$ 1.90	$ 0.85	$ 4.78	$ 3.04
Diluted	$ 1.87	$ 0.84	$ 4.71	$ 2.99
Weighted-average number of common shares outstanding:
Basic	18,807,104	18,781,401	18,809,823	18,731,203
Diluted	19,103,166	19,011,526	19,122,681	19,003,720