Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
ASSETS
Cash and cash equivalents	$ 278.2	$ 231.3
Cash, securities and other assets segregated under federal and other regulations (including $314.2 and $15.3 at fair value at December 31, 2014 and September 30, 2014, respectively)	647.4	448.0
Deposits and receivables from:
Exchange-clearing organizations (including $1,060.6 and $1,255.4 at fair value at December 31, 2014 and September 30, 2014, respectively)	1,575.4	1,731.4
Broker-dealers, clearing organizations and counterparties (including $(5.6) and $(1.1) at fair value at December 31, 2014 and September 30, 2014, respectively)	132.4	123.0
Receivables from customers, net	63.6us-gaap_AccountsReceivableNet	55.6us-gaap_AccountsReceivableNet
Notes receivable, net	75.2us-gaap_NotesReceivableNet	65.2us-gaap_NotesReceivableNet
Income taxes receivable	12.7us-gaap_IncomeTaxReceivable	10.8us-gaap_IncomeTaxReceivable
Financial instruments owned, at fair value	159.9	197.9
Physical commodities inventory	45.1us-gaap_InventoryGross	40.0us-gaap_InventoryGross
Deferred income taxes, net	30.0us-gaap_DeferredTaxAssetsLiabilitiesNet	32.0us-gaap_DeferredTaxAssetsLiabilitiesNet
Property and equipment, net	15.2us-gaap_PropertyPlantAndEquipmentNet	15.9us-gaap_PropertyPlantAndEquipmentNet
Goodwill and intangible assets, net	57.6intl_GoodwillAndIntangibleAssetsNet	58.0intl_GoodwillAndIntangibleAssetsNet
Other assets	34.5us-gaap_PrepaidExpenseAndOtherAssets	30.6us-gaap_PrepaidExpenseAndOtherAssets
Total assets	3,127.2us-gaap_Assets	3,039.7us-gaap_Assets
Liabilities:
Accounts payable and other accrued liabilities (including $2.2 and $5.5 at fair value at December 31, 2014 and September 30, 2014, respectively)	90.8	114.1
Payables to:
Customers	2,325.5us-gaap_PayablesToCustomers	2,228.7us-gaap_PayablesToCustomers
Broker-dealers, clearing organizations and counterparties	24.7	11.9
Lenders under loans	49.1us-gaap_LineOfCredit	22.5us-gaap_LineOfCredit
Senior unsecured notes	45.5us-gaap_SeniorNotes	45.5us-gaap_SeniorNotes
Income taxes payable	9.6us-gaap_AccruedIncomeTaxes	7.6us-gaap_AccruedIncomeTaxes
Financial instruments sold, not yet purchased, at fair value	227.0	264.0
Total liabilities	2,772.2us-gaap_Liabilities	2,694.3us-gaap_Liabilities
Commitments and contingencies (Note 11)
Stockholders' Equity:
Preferred stock, $.01 par value. Authorized 1,000,000 shares; no shares issued or outstanding	0us-gaap_PreferredStockValueOutstanding	0us-gaap_PreferredStockValueOutstanding
Common stock, $0.01 par value. Authorized 30,000,000 shares; 20,021,232 issued and 19,003,750 outstanding at December 31, 2014 and 19,826,635 issued and 18,883,662 outstanding at September 30, 2014	0.2us-gaap_CommonStockValueOutstanding	0.2us-gaap_CommonStockValueOutstanding
Common stock in treasury, at cost - 1,017,482 shares at December 31, 2014 and 942,973 shares at September 30, 2014, respectively	(19.0)us-gaap_TreasuryStockValue	(17.5)us-gaap_TreasuryStockValue
Additional paid-in capital	230.5us-gaap_AdditionalPaidInCapital	229.6us-gaap_AdditionalPaidInCapital
Retained earnings	154.1	144.7
Accumulated other comprehensive loss, net	(10.8)	(11.6)
Total stockholders' equity	355.0	345.4
Total liabilities and equity	$ 3,127.2	$ 3,039.7

Amount combines the carrying amounts for goodwill and finite- and indefinite-lived intangible assets. Goodwill represents the carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquire, adjusted for any amortization recognized prior to adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Indefinite-lived intangible assets represent the carrying amount of intangible assets, excluding goodwill, which have a projected indefinite period of benefit (hence are not amortized), allocated to the reportable segment. These assets, acquired either individually or as part of a group of assets, in either an asset acquisition or business combination, are assessed at least annually for impairment. Examples may include trade secrets, contractual rights, trade names, and licensing agreements. Finite-lived intangible assets are the aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

No definition available.