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Capital and Other Regulatory Requirements (Tables) | 3 Months Ended
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Dec. 31, 2017
Capital and Other Regulatory Requirements [Abstract] |
Regulatory Capital Requirements under Banking Regulations [Text Block] | Capital and Other Regulatory Requirements The Company’s activities are subject to significant governmental regulation, both in the United States and overseas. The subsidiaries of the Company were in compliance with all of their regulatory requirements as of December 31, 2017, as follows:
(in millions) |  |  |  |  |  | As of December 31, 2017
Subsidiary | Regulatory Authority | Jurisdiction |  | Requirement Type |  | Actual |  | Minimum Requirement
INTL FCStone Financial Inc. | SEC and Commodity Futures Trading Commission ("CFTC") | United States |  | Net capital |  | $ | 136.1 |  |  | $ | 74.2 |
INTL FCStone Financial Inc. | CFTC | United States |  | Segregated funds |  | $ | 2,256.9 |  |  | $ | 2,204.4 |
INTL FCStone Financial Inc. | CFTC | United States |  | Secured funds |  | $ | 164.4 |  |  | $ | 147.8 |
INTL FCStone Financial Inc. | SEC | United States |  | Customer reserve |  | $ | 12.0 |  |  | $ | — |
INTL FCStone Financial Inc. | SEC | United States |  | PAB reserve |  | $ | 10.7 |  |  | $ | 10.2 |
INTL Custody & Clearing Soluntions Inc. | SEC | United States |  | Net capital |  | $ | 1.7 |  |  | $ | 0.1 |
SA Stone Wealth Management Inc. | SEC | United States |  | Net capital |  | $ | 4.2 |  |  | $ | 0.3 |
INTL FCStone Ltd(1) | Financial Conduct Authority ("FCA") | United Kingdom |  | Net capital |  | $ | 191.8 |  |  | $ | 90.2 |
INTL FCStone Ltd | FCA | United Kingdom |  | Segregated funds |  | $ | 113.8 |  |  | $ | 113.8 |
INTL Netherlands BV(1) | FCA | United Kingdom |  | Net capital |  | $ | 191.1 |  |  | $ | 90.2 |
INTL FCStone DTVM Ltda. | Brazilian Central Bank and Securities and Exchange Commission of Brazil | Brazil |  | Capital adequacy |  | $ | 12.6 |  |  | $ | 0.5 |
INTL Gainvest S.A. | National Securities Commission ("CNV") | Argentina |  | Capital adequacy |  | $ | 4.5 |  |  | $ | 0.2 |
INTL Gainvest S.A. | CNV | Argentina |  | Net capital |  | $ | 3.0 |  |  | $ | 0.1 |
INTL CIBSA S.A. | CNV | Argentina |  | Capital adequacy |  | $ | 5.0 |  |  | $ | 0.9 |
INTL CIBSA S.A. | CNV | Argentina |  | Net capital |  | $ | 1.7 |  |  | $ | 0.5 |
(1) INTL Netherlands BV is a holding company that includes the ownership equity of INTL FCStone Ltd. The associated net capital amounts and minimum requirements should not be considered in aggregate. Certain other non-U.S. subsidiaries of the Company are also subject to capital adequacy requirements promulgated by authorities of the countries in which they operate. As of December 31, 2017, these subsidiaries were in compliance with their local capital adequacy requirements.

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- Definition Capital and Other Regulatory Requirements [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1C -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958572-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1E -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958574-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958569-112826 Reference 6: 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1F -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958575-112826 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1D -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958573-112826 + Details
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