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Regulatory Requirements and Subsidiary Dividend Restrictions (Notes) | 12 Months Ended
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Sep. 30, 2016
Capital and Other Regulatory Requirements [Abstract] |
Regulatory Capital Requirements under Banking Regulations [Text Block] | Regulatory Requirements and Subsidiary Dividend Restrictions The Company’s subsidiary INTL FCStone Financial is registered as a broker dealer and member of the Financial Industry Regulatory Authority (“FINRA”) subject to the SEC Uniform Net Capital Rule 15c3-1, which requires the maintenance of minimum net capital. INTL FCStone Financial is also a commodity futures commission merchant registered with the CFTC and subject to the net capital requirements of the CFTC Regulation 1.17. Under the more restrictive of these rules, INTL FCStone Financial is required to maintain “adjusted net capital”, equivalent to the greater of $1,000,000 or 8 percent of customer and noncustomer risk maintenance margin requirements on all positions, as defined in such rules, regulations, and requirements. Net capital and the related net capital requirement may fluctuate on a daily basis. INTL FCStone Financial also has restriction on dividends, which restricts the withdrawal of equity capital if the planned withdrawal would reduce net capital, subsequent to haircuts and charges, to an amount less than 120% of the greatest minimum requirement. Pursuant to the requirements of the Commodity Exchange Act, funds deposited by customers of INTL FCStone Financial relating to their trading of futures and options on futures on a U.S. commodities exchange must be carried in separate accounts which are designated as segregated customers’ accounts. Pursuant to the requirements of the CFTC, funds deposited by customers of INTL FCStone Financial relating to their trading of futures and options on futures traded on, or subject to the rules of, a foreign board of trade must be carried in separate accounts in an amount sufficient to satisfy all of INTL FCStone Financial’s current obligations to customers trading foreign futures and foreign options on foreign commodity exchanges or boards of trade, which are designated as secured customers’ accounts. See Additional Information of INTL FCStone Financial Related to Customer Segregated and Secured Funds further below for additional information regarding INTL FCStone Financial’s calculation of segregated and secured customer funds. The Company’s subsidiaries Sterne, Agee & Leach, Inc., Sterne Agee Clearing, Inc. and Sterne Agee Financial Services, Inc. are subject to the SEC Uniform Net Capital Rule 15c3-1 under the Securities Exchange Act of 1934. The Company’s subsidiary INTL FCStone Ltd is regulated by the Financial Conduct Authority (“FCA”), the regulator of the financial services industry in the United Kingdom, as a Financial Services Firm under part IV of the Financial Services and Markets Act 2000. The regulations impose regulatory capital, as well as conduct of business, governance, and other requirements. The conduct of business rules include those that govern the treatment of customer money and other assets which under certain circumstances for certain classes of customer must be segregated from the firm’s own assets. The Company’s subsidiary INTL FCStone Pty Ltd is regulated by the Australian Securities and Investment Commission and is subject to a net tangible asset capital requirement. INTL FCStone Pty Ltd is also regulated by New Zealand Clearing Limited, and is subject to a capital adequacy requirement. FCStone Commodity Services (Europe), Ltd. is domiciled in Ireland and subject to regulation by the Central Bank of Ireland, and is subject to a net capital requirement. INTL FCStone DTVM Ltda. (“INTL FCStone DTVM”) is a registered broker-dealer and regulated by the Brazilian Central Bank and Securities and Exchange Commission of Brazil, and is subject to a capital adequacy requirement. All subsidiaries of the Company are in compliance with all of their regulatory requirements as of September 30, 2016, as follows:
(in millions) |  |  |  |  | As of September 30, 2016
Subsidiary | Regulatory Authority |  | Requirement Type |  | Actual |  | Minimum Requirement
INTL FCStone Financial Inc. | SEC and CFTC |  | Net capital |  | $ | 140.8 |  |  | $ | 81.7 |
INTL FCStone Financial Inc. | CFTC |  | Segregated funds |  | $ | 2,177.9 |  |  | $ | 2,126.4 |
INTL FCStone Financial Inc. | CFTC |  | Secured funds |  | $ | 107.7 |  |  | $ | 91.3 |
Sterne Agee Clearing Inc. | SEC |  | Net capital |  | $ | 1.0 |  |  | $ | 0.1 |
Sterne, Agee & Leach, Inc. | SEC |  | Net capital |  | $ | 29.0 |  |  | $ | 2.0 |
Sterne Agee Financial Services, Inc. | SEC |  | Net capital |  | $ | 3.3 |  |  | $ | 0.3 |
INTL FCStone Ltd | FCA (United Kingdom) |  | Net capital |  | $ | 136.9 |  |  | $ | 84.9 |
INTL FCStone Ltd | FCA (United Kingdom) |  | Segregated funds |  | $ | 54.8 |  |  | $ | 49.5 |
INTL Netherlands BV | FCA (United Kingdom) |  | Net capital |  | $ | 136.1 |  |  | $ | 85.0 |
INTL FCStone DTVM Ltda. | Brazilian Central Bank and Securities and Exchange Commission of Brazil |  | Capital adequacy |  | $ | 2.5 |  |  | $ | 0.5 |
INTL Gainvest S.A. | National Securities Commission ("CNV") |  | Capital adequacy |  | $ | 7.7 |  |  | $ | 0.1 |
INTL Gainvest S.A. | CNV |  | Net capital |  | $ | 3.6 |  |  | $ | 0.1 |
INTL Capital S.A. | General Inspector of Justice (Argentina) |  | Net capital |  | $ | 15.3 |  |  | $ | 12.6 |
INTL CIBSA S.A. | CNV |  | Capital adequacy |  | $ | 7.1 |  |  | $ | 1.1 |
INTL CIBSA S.A. | CNV |  | Net capital |  | $ | 10.9 |  |  | $ | 0.6 |
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 September 30, 2016, these subsidiaries were in compliance with their local capital adequacy requirements. Additional Information of INTL FCStone Financial Related to Customer Segregated and Secured Funds Pursuant to the requirements of the Commodity Exchange Act, funds deposited by customers of INTL FCStone Financial relating to futures and options on futures positions in regulated commodities must be carried in separate accounts which are designated as segregated customers’ accounts. Certain amounts in the accompanying table reflect reclassifications and eliminations required for regulatory filing. Funds deposited by customers and other assets, which have been segregated as belonging to the commodity customers as of September 30, 2016 and 2015, are as follows:
(in millions) | September 30, 2016 |  | September 30, 2015
Cash, at banks - segregated | $ | 383.6 |  |  | $ | 126.9 |
Securities representing investments of customers' funds, at banks | 595.4 |  |  | 492.5 |
Securities held for customers in lieu of cash, at banks | 1.8 |  |  | 0.9 |
Deposits with and receivables from: |  |  |
Exchange-clearing organizations, including securities, net of omnibus eliminations | 1,173.9 |  |  | 1,237.8 |
Securities held for customers in lieu of cash | 23.2 |  |  | 22.1 |
Total customer-segregated funds | 2,177.9 |  |  | 1,880.2 |
Amount required to be segregated | 2,126.4 |  |  | 1,830.9 |
Excess funds in segregation | $ | 51.5 |  |  | $ | 49.3 |
Funds deposited by customers and other assets, which are held in separate accounts for customers trading foreign futures and foreign options customers, as of September 30, 2016 and 2015 are as follows:
(in millions) | September 30, 2016 |  | September 30, 2015
Cash - secured | $ | 70.5 |  |  | $ | 64.7 |
Securities | — |  |  | — |
Equities with registered futures commission merchants | 3.6 |  |  | 2.6 |
Amounts held by clearing organizations of foreign boards of trade | 6.7 |  |  | — |
Amounts held by members of foreign boards of trade | 26.9 |  |  | 18.3 |
Total customer-secured funds | 107.7 |  |  | 85.6 |
Amount required to be secured | 91.3 |  |  | 65.2 |
Excess secured funds | $ | 16.4 |  |  | $ | 20.4 |

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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=35709795&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=35709795&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=35709795&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=35709795&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=35709795&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=35709795&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=35709795&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=35709795&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=35709795&loc=SL5958573-112826 + Details
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