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Credit Facilities - Number of Credit Facilities (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Number of credit facilities | 4
Main line of credit facilities [Member] |
Borrowing Capacity Under Credit Facilities | $ 769.0
HCO Syndicated line of credit facility [Member] |
Line of Credit Facility, Maximum Borrowing Capacity | 196.5
Borrowing Capacity Under Credit Facilities | 384.0
FCS Margin line of credit facility [Member] |
Line of Credit Facility, Maximum Borrowing Capacity | 75.0
FMS Sub-note commodity line of credit facility [Member] |
Line of Credit Facility, Maximum Borrowing Capacity | 260.0
INTL FCStone Ltd [Member] |
Line of Credit Facility, Maximum Borrowing Capacity | 100.0
INTL FCStone Ltd [Member] |
Line of Credit Facility, Maximum Borrowing Capacity | $ 50.0

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- Definition Borrowing Capacity Under Credit Facilities + References No definition available. + Details
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Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of credit facilities available to the company. + References No definition available. + Details
Name: | intl_NumberOfCreditFacilities
Namespace Prefix: | intl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

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

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

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