Condensed Consolidated Cash Flows Statements - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 8.8	$ 9.4
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	1.9	1.9
Provision for bad debts and impairments	2.0	0.0
Deferred income taxes	(2.8)	1.4
Amortization of debt issuance costs and debt discount	0.2	0.2
Amortization of stock-based compensation	0.9	0.9
Changes in operating assets and liabilities, net:
Cash, securities and other assets segregated under federal and other regulations	(39.5)	(202.7)
Securities purchased under agreements to resell	(9.9)	0.0
Deposits and receivables from exchange-clearing organizations	(55.6)	155.4
Deposits and receivables from broker-dealers, clearing organizations, and counterparties	87.9	(10.1)
Receivables from customers, net	58.0	(8.0)
Notes receivable from customers, net	(9.7)	(10.0)
Income taxes receivable	2.1	(1.9)
Financial instruments owned, at fair value	(158.2)	38.4
Physical commodities inventory	(15.1)	(5.1)
Other assets	(1.1)	(4.2)
Accounts payable and other accrued liabilities	(33.4)	(22.2)
Payables to customers	13.3	104.1
Payables to broker-dealers, clearing organizations and counterparties	(176.6)	12.8
Income taxes payable	(1.8)	2.1
Payables under repurchase agreements	131.6	0.0
Financial instruments sold, not yet purchased, at fair value	113.6	(37.0)
Net cash (used in) provided by operating activities	(83.4)	25.4
Cash flows from investing activities:
Purchase of property and equipment	(5.9)	(0.9)
Net cash used in investing activities	(5.9)	(0.9)
Cash flows from financing activities:
Net change in payable to lenders under loans	99.5	26.6
Payments of note payable	(0.2)	0.0
Payments related to earn-outs on acquisitions	0.0	(1.6)
Debt issuance costs	(0.1)	(0.1)
Exercise of stock options	1.6	1.4
Share repurchases	0.0	(2.4)
Income tax benefit on stock options and awards	0.7	0.0
Net cash provided by financing activities	101.5	23.9
Effect of exchange rates on cash and cash equivalents	(6.0)	(1.5)
Net increase in cash and cash equivalents	6.2	46.9
Cash and cash equivalents at beginning of period	268.1	231.3
Cash and cash equivalents at end of period	274.3	278.2
Supplemental disclosure of cash flow information:
Cash paid for interest	4.4	2.3
Income taxes paid, net of cash refunds	5.1	2.6
Supplemental disclosure of non-cash investing and financing activities:
Additional consideration payable related to acquisitions, net	0.2	0.1
Payable related to repurchase of stock	$ 0.0	$ 0.5