XML 63 R43.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Regulatory Requirements and Subsidiary Dividend Restrictions (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2018
Capital and Other Regulatory Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] | All subsidiaries of the Company are in compliance with all of their regulatory requirements as of September 30, 2018, as follows:
(in millions) |  |  |  |  | As of September 30, 2018
Subsidiary | Regulatory Authority |  | Requirement Type |  | Actual |  | Minimum Requirement
INTL FCStone Financial Inc. | SEC and CFTC |  | Net capital |  | $ | 167.7 |  |  | $ | 101.4 |
INTL FCStone Financial Inc. | CFTC |  | Segregated funds |  | $ | 2,637.0 |  |  | $ | 2,579.7 |
INTL FCStone Financial Inc. | CFTC |  | Secured funds |  | $ | 148.9 |  |  | $ | 132.8 |
INTL FCStone Financial Inc. | SEC |  | Customer reserve |  | * |  |  | $ | 6.4 |
INTL FCStone Financial Inc. | SEC |  | PAB reserve |  | $ | 0.3 |  |  | $ | — |
SA Stone Wealth Management Inc. | SEC |  | Net capital |  | $ | 4.6 |  |  | $ | 0.4 |
INTL FCStone Ltd | FCA (United Kingdom) |  | Net capital |  | $ | 193.1 |  |  | $ | 95.9 |
INTL FCStone Ltd | FCA (United Kingdom) |  | Segregated funds |  | $ | 187.3 |  |  | $ | 182.1 |
INTL Netherlands BV | FCA (United Kingdom) |  | Net capital |  | $ | 193.0 |  |  | $ | 95.9 |
INTL FCStone DTVM Ltda. | Brazilian Central Bank and Securities and Exchange Commission of Brazil |  | Capital adequacy |  | $ | 11.2 |  |  | $ | 2.1 |
INTL Gainvest S.A. | National Securities Commission ("CNV") |  | Capital adequacy |  | $ | 4.2 |  |  | $ | 0.1 |
INTL Gainvest S.A. | CNV |  | Net capital |  | $ | 1.2 |  |  | $ | 0.1 |
INTL CIBSA S.A. | CNV |  | Capital adequacy |  | $ | 4.4 |  |  | $ | 0.5 |
INTL CIBSA S.A. | CNV |  | Net capital |  | $ | 3.1 |  |  | $ | 0.3 |

X
- Definition Capital and Other Regulatory Requirements [Abstract] + References No definition available. + Details
Name: | intl_CapitalAndOtherRegulatoryRequirementsAbstract
Namespace Prefix: | intl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
Name: | us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration