Condensed Consolidated Cash Flows Statements (USD $) In Millions, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash paid for acquisitions, net	$ 7.8	$ 0
Cash flows from operating activities:
Net income	22.4us-gaap_ProfitLoss	10.0us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	3.7us-gaap_DepreciationAndAmortization	3.5us-gaap_DepreciationAndAmortization
Provision for bad debts and impairments	2.8us-gaap_TangibleAssetImpairmentCharges	0.7us-gaap_TangibleAssetImpairmentCharges
Deferred income taxes	2.3us-gaap_DeferredIncomeTaxExpenseBenefit	(3.5)us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of debt issuance costs and debt discount	0.5	0.5
Amortization of stock-based compensation	1.8us-gaap_ShareBasedCompensation	2.2us-gaap_ShareBasedCompensation
Loss on sale of property and equipment	0.4	0.2
Changes in operating assets and liabilities, net:
Cash, securities and other assets segregated under federal and other regulations	(244.8)	(266.3)
Securities purchased under agreements to resell	3.6	0
Deposits and receivables from exchange-clearing organizations	313.0us-gaap_IncreaseDecreaseInDeposits	86.7us-gaap_IncreaseDecreaseInDeposits
Deposits and receivables from broker-dealers, clearing organizations, and counterparties	(66.5)	41.6
Receivable from customers, net	(18.1)	22.4
Notes receivable from customers, net	(11.9)	(27.6)
Income taxes receivable	(0.3)	2.3
Financial instruments owned, at fair value	(356.6)	(2.7)
Physical commodities inventory	(19.6)us-gaap_IncreaseDecreaseInInventories	(8.9)us-gaap_IncreaseDecreaseInInventories
Other assets	(15.7)	(5.0)
Accounts payable and other accrued liabilities	(9.6)	(16.9)
Payable to customers	(36.5)	177.1
Payable to broker-dealers, clearing organizations and counterparties	123.8	(12.4)
Income taxes payable	(1.0)	3.0
Payables under repurchase agreements	87.6	0
Financial instruments sold, not yet purchased, at fair value	222.5	37.6
Net cash (used in) provided by operating activities	3.8	44.5
Cash flows from investing activities:
Purchase of property and equipment	(1.9)	(3.1)
Net cash (used in) provided by investing activities	(9.7)	(3.1)
Cash flows from financing activities:
Net change in payable to lenders under loans	23.3us-gaap_ProceedsFromRepaymentsOfDebt	(20.5)us-gaap_ProceedsFromRepaymentsOfDebt
Payments related to earn-outs on acquisitions	(2.2)	(0.3)
Debt issuance costs	(0.1)us-gaap_PaymentsOfDebtIssuanceCosts	(0.3)us-gaap_PaymentsOfDebtIssuanceCosts
Exercise of stock options	1.9	1.2
Share repurchases	(4.7)	(7.2)
Income tax expense on stock options and awards	0.4	0
Net cash provided by (used in) financing activities	18.6	(27.1)
Effect of exchange rates on cash and cash equivalents	(0.5)	(1.2)
Net decrease in cash and cash equivalents	12.2	13.1
Cash and cash equivalents at beginning of period	231.3	156.1
Cash and cash equivalents at end of period	243.5	169.2
Supplemental disclosure of cash flow information:
Cash paid for interest	5.0us-gaap_InterestPaid	5.0us-gaap_InterestPaid
Income taxes paid, net of cash refunds	7.6us-gaap_IncomeTaxesPaidNet	1.6us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash investing and financing activities:
Identified intangible assets and goodwill on acquisitions	3.0	0
Additional consideration payable related to acquisitions, net	1.7	0.3
Assets acquired	1,011.4	0
Liabilities assumed	(995.1)	0
Total net assets acquired	16.3	0
Deferred consideration payable related to acquisitions	5.0	0
Escrow deposits related to acquisitions	$ 5.0	$ 0

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The amount of intangibles that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The net book value of a nonmonetary asset transferred or exchanged in connection with the acquisition of a business or asset in a noncash transaction. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Nonmonetary assets and liabilities are assets and liabilities that will not result in cash receipts or cash payments in the future.

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The net cash inflow or outflow associated with the aggregate amount of adjustment to the purchase price of a previous acquisition.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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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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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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A device of credit enhancement where a part of the purchase price for the receivable/ payable is retained to serve as a cash collateral.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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