Consolidated Cash Flows Statements Statement (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Cash flows from operating activities:
Net income	$ 37.2	$ 5.1	$ 28.1
Depreciation and amortization	4.7	1.7	0.7
Provision for bad debts and impairments	6.2	3.5	0
Deferred income taxes	1.8	3.7	(3.7)
Amortization of debt issuance costs and debt discount	1.6	0.2	0.2
Convertible debt interest settled in company stock upon conversion	0.2	0	0
Noncontrolling interest	0	0	0.7
Amortization of stock-based compensation expense	2.3	1.9	1.9
Unrealized gains from INTL Consilium managed funds	0	0	(2.0)
Loss on disposition of INTL Consilium	0	0	0.4
Extraordinary loss (gain) on acquisition of FCStone	0	7.0	(18.5)
Impairment of INTL Sieramet	0	1.1	1.1
Deconsolidation and impairment of Agora-X subsidiary	0	(2.9)	0
Gain on acquisition of INTL Provident	(0.4)	0	0
Cash, securities and other assets segregated under federal and other regulations	(104.1)	(0.3)	0
Deposits and receivables from exchange-clearing organizations	(586.0)	(4.2)	0
Deposits and receivables from broker-dealers, clearing organizations, and counterparties	47.1	(57.6)	11.2
Receivable from customers, net	(39.1)	(18.2)	1.9
Notes receivable from customers, net	2.9	(7.0)	0
Income taxes receivable	0.6	35.4	(4.6)
Financial instruments owned and securities purchased under agreements to resell, at fair value	280.7	(212.7)	44.9
Physical commodities inventory	(35.6)	(18.1)	(49.6)
Other assets	(12.1)	3.9	(2.2)
Accounts payable and other accrued liabilities	30.8	1.9	(6.0)
Payable to customers	366.2	415.3	26.1
Payable to broker-dealers, clearing organizations and counterparties	(0.5)	(0.4)	(22.5)
Income taxes payable	1.6	0.4	0.6
Financial instruments sold, not yet purchased, at fair value	202.9	(46.7)	(26.1)
Net cash provided by (used in) operating activities	209.0	113.0	(17.4)
Cash flows from investing activities:
Capital contribution of consolidated joint venture partner	0	0	0.2
Capital distribution to consolidated joint venture partner	0	0	(2.8)
Deconsolidation of affiliates	0	(0.3)	(8.2)
Disposition of affiliates	0	0.2	0.4
Investment withdrawals from managed funds	0	0	17.9
Cash acquired with acquisition of FCStone	0	0	24.2
Cash paid for other acquisitions, net	(9.3)	(37.6)	(1.1)
Purchase of exchange memberships and common stock	(3.4)	0	0
Sale of exchange memberships and common stock	1.3	0	0
Purchase of property and equipment	(10.1)	(4.7)	(2.8)
Net cash (used in) provided by investing activities	(21.5)	(42.4)	27.8
Cash flows from financing activities:
Net change in payable to lenders under loans and overdrafts	(37.5)	6.1	(13.8)
Payments related to earn-outs on acquisitions	(9.4)	0	0
Repayment of subordinated debt	(0.5)	(56.0)	0
Share repurchase	0	0	(0.1)
Debt issuance costs	(2.4)	0	0
Exercise of stock options	1.4	0.7	0.4
Income tax benefit on stock options and awards	0	0	0.3
Net cash used in financing activities	(48.4)	(49.2)	(13.2)
Effect of exchange rates on cash and cash equivalents	(0.4)	0	0.5
Net increase (decrease) in cash and cash equivalents	138.7	21.4	(2.3)
Cash and cash equivalents at beginning of period	81.9	60.5	62.8
Cash and cash equivalents at end of period	220.6	81.9	60.5
Supplemental disclosure of cash flow information:
Cash paid for interest	9.5	7.4	8.8
Income taxes paid (received), net of cash refunds	17.6	(33.3)	8.3
Supplemental disclosure of non-cash investing and financing activities:
Conversion of subordinated notes to common stock, net	16.7	0	0.1
Additional consideration payable related to acquisitions	5.4
Assets acquired	0	0	1,178.9
Liabilities assumed	0	0	(1,020.5)
Noncontrolling interests	0	0	1.6
Total net assets acquired	0	0	160.0
Identified intangible assets and goodwill on acquisitions	4.9	39.8	0.7
Additional consideration payable related to acquisitions		26.3	0
Issuance of common stock related to acquisitions	$ 0	$ 0	$ 135.5