Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014
ASSETS
Cash and cash equivalents	$ 243.5	$ 231.3
Cash, securities and other assets segregated under federal and other regulations (including $509.0 and $15.3 at fair value at March 31, 2015 and September 30, 2014, respectively)	687.3	448.0
Securities purchased under agreements to resell	336.9	0
Deposits and receivables from:
Exchange-clearing organizations (including $1,008.7 and $1,255.4 at fair value at March 31, 2015 and September 30, 2014, respectively)	1,420.5	1,731.4
Broker-dealers, clearing organizations and counterparties (including $(28.6) and $(1.1) at fair value at March 31, 2015 and September 30, 2014, respectively)	193.1	123.0
Receivables from customers, net	72.2us-gaap_AccountsReceivableNet	55.6us-gaap_AccountsReceivableNet
Notes receivable, net	76.0us-gaap_NotesReceivableNet	65.2us-gaap_NotesReceivableNet
Income taxes receivable	11.0us-gaap_IncomeTaxReceivable	10.8us-gaap_IncomeTaxReceivable
Financial instruments owned, at fair value (includes securities pledged as collateral that can be sold or repledged of $183.4 at of March 31, 2015)	1,217.1	197.9
Physical commodities inventory	59.6us-gaap_InventoryGross	40.0us-gaap_InventoryGross
Deferred income taxes, net	27.5us-gaap_DeferredTaxAssetsLiabilitiesNet	32.0us-gaap_DeferredTaxAssetsLiabilitiesNet
Property and equipment, net	15.4us-gaap_PropertyPlantAndEquipmentNet	15.9us-gaap_PropertyPlantAndEquipmentNet
Goodwill and intangible assets, net	60.2intl_GoodwillAndIntangibleAssetsNet	58.0intl_GoodwillAndIntangibleAssetsNet
Other assets	42.3us-gaap_PrepaidExpenseAndOtherAssets	30.6us-gaap_PrepaidExpenseAndOtherAssets
Total assets	4,462.6us-gaap_Assets	3,039.7us-gaap_Assets
Liabilities:
Accounts payable and other accrued liabilities (including $3.1 and $5.5 at fair value at March 31, 2015 and September 30, 2014, respectively)	112.4	114.1
Payables to:
Customers	2,225.0us-gaap_PayablesToCustomers	2,228.7us-gaap_PayablesToCustomers
Broker-dealers, clearing organizations and counterparties (including $1.5 at fair value at March 31, 2015)	135.7	11.9
Lenders under loans and overdrafts	45.8us-gaap_LineOfCredit	22.5us-gaap_LineOfCredit
Senior unsecured notes	45.5us-gaap_SeniorNotes	45.5us-gaap_SeniorNotes
Income taxes payable	6.5us-gaap_AccruedIncomeTaxes	7.6us-gaap_AccruedIncomeTaxes
Payables under repurchase agreements	908.9	0
Financial instruments sold, not yet purchased, at fair value	613.3	264.0
Total liabilities	4,093.1us-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; 20,132,970 issued and 18,965,488 outstanding at March 31, 2015 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 - 1,167,482 shares at March 31, 2015 and 942,973 shares at September 30, 2014, respectively	(22.0)us-gaap_TreasuryStockValue	(17.5)us-gaap_TreasuryStockValue
Additional paid-in capital	233.5us-gaap_AdditionalPaidInCapital	229.6us-gaap_AdditionalPaidInCapital
Retained earnings	167.1	144.7
Accumulated other comprehensive loss, net	(9.3)	(11.6)
Total stockholders' equity	369.5	345.4
Total liabilities and equity	$ 4,462.6	$ 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.