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Capital and Other Regulatory Requirements - Regulatory Capital Requirements (Details) $ in Millions | Mar. 31, 2019 USD ($)
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FCStone LLC [Member] |
Net Capital under Commodity Exchange Act Computation | $ 165.3
Required Net Capital under Commodity Exchange Act | 85.5
Cash and Securities Segregated under Commodity Exchange Act Regulation | 2,120.7
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated | 2,064.7
Secured Funds | 129.7
Secured Funds Required Under Commodity Exchange Act | 114.1
Sterne Agee, and Leach, Inc [Member] |
Required Net Capital under Commodity Exchange Act | 0.4
Sterne Agee Financial Services, Inc. [Member] |
Net Capital under Commodity Exchange Act Computation | 4.9
INTL FCStone Ltd [Member] |
Net Capital under Commodity Exchange Act Computation | 235.7
Required Net Capital under Commodity Exchange Act | 111.8
Cash and Securities Segregated under Commodity Exchange Act Regulation | 169.9
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated | 175.3
INTL Netherlands BV [Member] |
Net Capital under Commodity Exchange Act Computation | 239.5
Required Net Capital under Commodity Exchange Act | 112.7
INTL FCStone DTVM Ltda [Member] |
Capital Required for Capital Adequacy | 0.4
Capital | 12.4
INTL FCStone Banco de Cambio S.A. [Member] [Member] |
Capital Required for Capital Adequacy | 1.7
Capital | 3.1
Gainvest S.A. Sociedad Gerente de FCI - Comision Nacional de Valores [Member] |
Net Capital under Commodity Exchange Act Computation | 0.7
Required Net Capital under Commodity Exchange Act | 0.1
Capital Required for Capital Adequacy | 0.1
Capital | 4.2
INTL Capital S.A. – General Inspector of Justice [Member] [Domain] |
Net Capital under Commodity Exchange Act Computation | 1.2
Required Net Capital under Commodity Exchange Act | 0.2
INTL Capital S.A. – Superintendence of Securities Markets of Buenos Aires [Member] [Domain] |
Capital Required for Capital Adequacy | 0.4
Capital | 5.1
Customer Reserve Requirement [Member] [Member] |
Cash Reserve Deposit Required and Made | 0.0
Cash Reserve Deposit Required | 0.0
PAB Reserve Requirement [Member] |
Cash Reserve Deposit Required and Made | 0.0
Cash Reserve Deposit Required | $ 0.0

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 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 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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