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Capital and Other Regulatory Requirements (Notes) | 9 Months Ended
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Jun. 30, 2020
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 in the international jurisdictions in which it operates. The subsidiaries of the Company were in compliance with all of their regulatory requirements as of June 30, 2020. The following table details those subsidiaries with minimum regulatory requirements in excess of $5 million along with the actual balance maintained as of June 30, 2020.
(in millions) |  |  |  |  |  | As of June 30, 2020
Subsidiary | Regulatory Authority | Jurisdiction |  | Requirement Type |  | Actual |  | Minimum Requirement
StoneX Financial Inc. | SEC and CFTC | United States |  | Net capital |  | $ | 198.6 |  |  | $ | 126.0 |
StoneX Financial Inc. | CFTC | United States |  | Segregated funds |  | $ | 2,705.6 |  |  | $ | 2,650.1 |
StoneX Financial Inc. | CFTC | United States |  | Secured funds |  | $ | 160.6 |  |  | $ | 148.8 |
StoneX Financial Inc. (1) | SEC | United States |  | Customer reserve |  | $ | 43.7 |  |  | $ | 46.8 |
StoneX Financial Ltd | Financial Conduct Authority ("FCA") | United Kingdom |  | Net capital |  | $ | 264.9 |  |  | $ | 110.8 |
StoneX Financial Ltd | FCA | United Kingdom |  | Segregated funds |  | $ | 471.8 |  |  | $ | 467.4 |
StoneX Financial Pte. Ltd. | Monetary Authority of Singapore ("MAS") | Singapore |  | Segregated funds |  | $ | 313.8 |  |  | $ | 307.0 |
(1) As of June 30, 2020, the Company had $43.7 million deposited in the customer special reserve bank account (“SRBA”). As a result of the reserve requirement determined through the weekly computation, the Company made an additional deposit of $8.1 million to the customer SRBA on July 2, 2020 to meet the customer segregation requirements under SEC Rule 15c3-3. 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 June 30, 2020, these subsidiaries were in compliance with their local capital adequacy requirements.

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- Definition The entire disclosure for regulatory capital requirement for depository and lending institutions. Institutions include, but not are not limited to, finance company, insured depository institution, bank holding company, savings and loan association holding company, bank and savings institution not federally insured, mortgage company, foreign financial institution and credit union. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1C -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958572-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1D -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958573-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958569-112826 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958577-112826 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1F -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958575-112826 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1E -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958574-112826 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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