Condensed Consolidated Cash Flows Statements (USD $) In Millions, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 9.4us-gaap_ProfitLoss	$ 2.5us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	1.9us-gaap_Depreciation	1.8us-gaap_Depreciation
Provision for bad debts and impairments	0us-gaap_ProvisionForDoubtfulAccounts	0.5us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes	1.4us-gaap_DeferredIncomeTaxExpenseBenefit	(3.2)us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of debt issuance costs and debt discount	0.2	0.3
Amortization of stock-based compensation	0.9us-gaap_ShareBasedCompensation	1.1us-gaap_ShareBasedCompensation
Loss on sale of property and equipment	0	0.2
Changes in operating assets and liabilities, net:
Cash, securities and other assets segregated under federal and other regulations	(202.7)	233.3
Deposits and receivables from exchange-clearing organizations	155.4us-gaap_IncreaseDecreaseInDeposits	(129.8)us-gaap_IncreaseDecreaseInDeposits
Deposits and receivables from broker-dealers, clearing organizations, and counterparties	(10.1)	4.8
Receivable from customers, net	(8.0)	18.3
Notes receivable from customers, net	(10.0)	(8.9)
Income taxes receivable	(1.9)	1.6
Financial instruments owned, at fair value	38.4	(11.9)
Physical commodities inventory	(5.1)us-gaap_IncreaseDecreaseInInventories	32.4us-gaap_IncreaseDecreaseInInventories
Other assets	(4.2)	2.4
Accounts payable and other accrued liabilities	(22.2)	(14.3)
Payable to customers	104.1	(107.4)
Payable to broker-dealers, clearing organizations and counterparties	12.8	(13.4)
Income taxes payable	2.1	0.9
Financial instruments sold, not yet purchased, at fair value	(37.0)	31.4
Net cash (used in) provided by operating activities	25.4	42.6
Cash flows from investing activities:
Purchase of property and equipment	(0.9)	(1.3)
Net cash (used in) provided by investing activities	(0.9)	(1.3)
Cash flows from financing activities:
Net change in payable to lenders under loans	26.6us-gaap_ProceedsFromRepaymentsOfDebt	(0.8)us-gaap_ProceedsFromRepaymentsOfDebt
Payments related to earn-outs on acquisitions	(1.6)	(0.3)
Debt issuance costs	(0.1)us-gaap_PaymentsOfDebtIssuanceCosts	(0.3)us-gaap_PaymentsOfDebtIssuanceCosts
Exercise of stock options	1.4	0.5
Repurchase of stock	(2.4)	(1.3)
Net cash provided by (used in) financing activities	23.9	(2.2)
Effect of exchange rates on cash and cash equivalents	(1.5)	(0.3)
Net decrease in cash and cash equivalents	46.9	38.8
Cash and cash equivalents at beginning of period	231.3	156.1
Cash and cash equivalents at end of period	278.2	194.9
Supplemental disclosure of cash flow information:
Cash paid for interest	2.3us-gaap_InterestPaidNet	2.6us-gaap_InterestPaidNet
Income taxes paid, net of cash refunds	2.6us-gaap_IncomeTaxesPaidNet	1.5us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash investing and financing activities:
Additional consideration payable related to acquisitions, net	0.1	0.2
Payable related to repurchase of stock	$ 0.5us-gaap_StockIssued1	$ 0us-gaap_StockIssued1

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The fair value of stock issued in noncash financing activities.

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