Condensed Consolidated Income Statements (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Sales of physical commodities	$ 14,291.6	$ 8,329.4	$ 27,785.9	$ 16,130.6
Trading gains, net	84.8	64.7	155.1	116.4
Commission and clearing fees	47.2	47.3	96.7	89.5
Consulting and management fees	9.3	9.5	19.7	21.5
Interest income	9.0	1.9	12.1	3.3
Other income	0.1	0.1	0.2	0.3
Total revenues	14,442.0	8,452.9	28,069.7	16,361.6
Cost of sales of physical commodities	14,285.5	8,323.7	27,775.7	16,119.5
Operating revenues	156.5	129.2	294.0	242.1
Transaction-based clearing expenses	31.8	27.7	61.2	52.9
Introducing broker commissions	12.3	12.8	24.5	24.4
Interest expense	4.5	2.8	7.2	5.5
Net operating revenues	107.9	85.9	201.1	159.3
Compensation and other expenses:
Compensation and benefits	63.1	52.7	119.5	99.0
Communication and data services	7.2	6.2	13.9	12.4
Occupancy and equipment rental	3.8	3.2	6.9	6.2
Professional fees	3.1	4.1	6.4	8.4
Travel and business development	2.5	2.0	5.3	4.8
Depreciation and amortization	1.8	1.7	3.7	3.6
Bad debts and impairments	2.8	0.4	2.8	0.7
Other	5.5	5.3	10.9	10.0
Total compensation and other expenses	89.8	75.6	169.4	145.1
Income from continuing operations, before tax	18.1	10.3	31.7	14.2
Income tax expense	5.1	2.6	9.3	4.1
Net income from continuing operations	13.0	7.7	22.4	10.1
Loss from discontinued operations, net of tax	0	(0.2)	0	(0.1)
Net income	$ 13.0	$ 7.5	$ 22.4	$ 10.0
Basic earnings per share:
Income from continuing operations	$ 0.68	$ 0.40	$ 1.18	$ 0.53
Loss income from discontinued operations	$ 0.00	$ (0.01)	$ 0.00	$ (0.01)
Net income per common share	$ 0.68	$ 0.39	$ 1.18	$ 0.52
Diluted earnings per share:
Income from continuing operations	$ 0.67	$ 0.40	$ 1.16	$ 0.52
Loss income from discontinued operations	$ 0.00	$ (0.01)	$ 0.00	$ (0.01)
Net income per common share	$ 0.67	$ 0.39	$ 1.16	$ 0.51
Weighted-average number of common shares outstanding:
Basic	18,599,011	18,609,550	18,546,377	18,627,383
Diluted	18,957,780	18,955,128	18,743,033	19,274,153