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Assets and Liabilities, at Fair Value Assets and Liabilities, at Fair Value - Exchange Firm Common Stock (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018
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Equity Investments in Exchange Stock - Cost | $ 3.7 | $ 3.7
Financial Instruments, Owned, at Fair Value | $ 2,175.2 | $ 2,054.8

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- Definition Equity Investments in Exchange Stock - Cost + References No definition available. + Details
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Namespace Prefix: | intl_
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Balance Type: | debit
Period Type: | instant

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- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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