XML 94 R79.htm IDEA: XBRL DOCUMENT
v3.20.2

Capital and Other Regulatory Requirements - Regulatory Capital Requirements (Details) $ in Millions | Jun. 30, 2020 USD ($)
--- | ---
FCStone LLC [Member] |
Cash Reserve Deposit Required and Made | $ 43.7
Cash Reserve Deposit Required | 46.8
Futures Commission Merchant, Commodity Exchange Act, Adjusted Net Capital | 198.6
Futures Commission Merchant, Commodity Exchange Act, Required Net Capital | 126.0
Cash and Securities Segregated under Commodity Exchange Act Regulation | 2,705.6
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated | 2,650.1
Secured Funds | 160.6
Secured Funds Required Under Commodity Exchange Act | 148.8
INTL FCStone Ltd [Member] |
Futures Commission Merchant, Commodity Exchange Act, Adjusted Net Capital | 264.9
Futures Commission Merchant, Commodity Exchange Act, Required Net Capital | 110.8
Cash and Securities Segregated under Commodity Exchange Act Regulation | 471.8
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated | 467.4
INTL FCStone Pte Ltd [Member] |
Cash and Securities Segregated under Commodity Exchange Act Regulation | 313.8
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated | $ 307.0

X
- Definition Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated + References No definition available. + Details
Name: | intl_CashAndSecuritiesSegregatedUnderCommodityExchangeActRegulationAmountRequiredToBeSegregated
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition cashreservedepositrequired + References No definition available. + Details
Name: | intl_CashReserveDepositRequired
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Secured funds + References No definition available. + Details
Name: | intl_SecuredFunds
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Secured Funds Required Under Commodity Exchange Act + References No definition available. + Details
Name: | intl_SecuredFundsRequiredUnderCommodityExchangeAct
Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of adjusted net capital of futures commission merchant (FCM) per Commodity Futures Trading Commission's (CFTC) requirement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 17 -Number 1 -Section 17 -Paragraph (a) -Subparagraph (5) + Details
Name: | srt_NetCapitalUnderCommodityExchangeActComputation
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of net capital required to be maintained by futures commission merchant (FCM) per Commodity Futures Trading Commission's (CFTC) requirement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 17 -Number 1 -Section 17 -Paragraph (a) -Subparagraph (1)(i) + Details
Name: | srt_RequiredNetCapitalUnderCommodityExchangeAct1
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash and securities deposited in a special reserve account for the exclusive benefit of customers pursuant to the Commodity Exchange Act. + References No definition available. + Details
Name: | us-gaap_CashAndSecuritiesSegregatedUnderCommodityExchangeActRegulation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116631393&loc=SL116631396-227033 + Details
Name: | us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=intl_FcstoneLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=intl_INTLFCStoneLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=intl_INTLFCStonePteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |