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Receivables From Customers, Net and Notes Receivable, Net - Exim Bank Notes Receivable (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Insured short-term notes receivable | $ 2.1 |  | $ 5.0
Obligations for participation rights | $ 2.1 |  | $ 4.6
Minimum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Short Term Notes Receivable Outstanding Balance Threshold, Percentage | 90.00% |  |
Maximum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Short Term Notes Receivable Outstanding Balance Threshold, Percentage |  | 98.00% |

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- Definition Insured short-term notes receivable + References No definition available. + Details
Name: | intl_InsuredShortTermNotesReceivable
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The obligations the company has related to the sale of participations rights in short-term notes receivables. + References No definition available. + Details
Name: | intl_Obligationsforparticipationrights
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Short Term Notes Receivable Outstanding Balance Threshold, Percentage + References No definition available. + Details
Name: | intl_ShortTermNotesReceivableOutstandingBalanceThresholdPercentage
Namespace Prefix: | intl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |