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Capital and Other Regulatory Requirements - Regulatory Capital Requirements (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Mar. 31, 2018
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FCStone LLC [Member] |  |
Net Capital under Commodity Exchange Act Computation | $ 157.0 |
Required Net Capital under Commodity Exchange Act |  | $ 93.3
Cash and Securities Segregated under Commodity Exchange Act Regulation | 2,452.9 |
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated |  | 2,397.0
Secured Funds | 162.6 |
Secured Funds Required Under Commodity Exchange Act |  | 144.8
Sterne Agee Clearing, Inc. [Member] |  |
Net Capital under Commodity Exchange Act Computation | 2.0 |
Required Net Capital under Commodity Exchange Act |  | 0.1
Sterne Agee, and Leach, Inc [Member] |  |
Net Capital under Commodity Exchange Act Computation | 3.7 |
Required Net Capital under Commodity Exchange Act |  | 0.5
INTL FCStone Ltd [Member] |  |
Net Capital under Commodity Exchange Act Computation | 193.2 |
Required Net Capital under Commodity Exchange Act |  | 91.7
Cash and Securities Segregated under Commodity Exchange Act Regulation | 167.4 |
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated |  | 163.4
INTL Netherlands BV [Member] |  |
Net Capital under Commodity Exchange Act Computation | 192.4 |
Required Net Capital under Commodity Exchange Act |  | 91.7
INTL FCStone DTVM Ltda [Member] |  |
Net Capital | 11.6 |
Capital Required for Capital Adequacy |  | 2.2
Gainvest S.A. Sociedad Gerente de FCI - Comision Nacional de Valores [Member] |  |
Net Capital under Commodity Exchange Act Computation | 1.4 |
Required Net Capital under Commodity Exchange Act |  | 0.1
Net Capital | 4.7 |
Capital Required for Capital Adequacy |  | 0.1
INTL Capital S.A. – General Inspector of Justice [Member] [Domain] |  |
Net Capital under Commodity Exchange Act Computation | 4.8 |
Required Net Capital under Commodity Exchange Act |  | 0.6
INTL Capital S.A. – Superintendence of Securities Markets of Buenos Aires [Member] [Domain] |  |
Net Capital under Commodity Exchange Act Computation | 0.9 |
Required Net Capital under Commodity Exchange Act |  | 0.4
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 minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: 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 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=84167132&loc=SL5958568-112826 + Details
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