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Regulatory Requirements and Subsidiary Dividend Restrictions (Tables) | 12 Months Ended
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Sep. 30, 2016
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, 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 |
Schedule of Regulatory Assets [Table Text Block] | 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 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=35709795&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=35709795&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=35709795&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=35709795&loc=SL5958577-112826 + Details
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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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