Capital and Other Regulatory Requirements (Notes)

6 Months Ended

Mar. 31, 2018

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 March 31, 2018, as follows:

(in millions)				As of March 31, 2018
Subsidiary	Regulatory Authority	Jurisdiction	Requirement Type	Actual		Minimum Requirement
INTL FCStone Financial Inc.	SEC and Commodity Futures Trading Commission ("CFTC")	United States	Net capital	$	152.3	$	83.6
INTL FCStone Financial Inc.	CFTC	United States	Segregated funds	$	2,357.1	$	2,303.2
INTL FCStone Financial Inc.	CFTC	United States	Secured funds	$	144.0	$	128.3
INTL FCStone Financial Inc.	SEC	United States	Customer reserve	$	0.7	$	—
INTL FCStone Financial Inc.	SEC	United States	PAB reserve	$	5.5	$	2.7
INTL Custody & Clearing Solutions Inc.	SEC	United States	Net capital	$	1.9	$	0.1
SA Stone Wealth Management Inc.	SEC	United States	Net capital	$	3.9	$	0.4
INTL FCStone Ltd(1)	Financial Conduct Authority ("FCA")	United Kingdom	Net capital	$	193.6	$	90.3
INTL FCStone Ltd	FCA	United Kingdom	Segregated funds	$	183.4	$	183.4
INTL Netherlands BV(1)	FCA	United Kingdom	Net capital	$	192.9	$	90.3
INTL FCStone DTVM Ltda.	Brazilian Central Bank and Securities and Exchange Commission of Brazil	Brazil	Capital adequacy	$	12.9	$	2.3
INTL Gainvest S.A.	National Securities Commission ("CNV")	Argentina	Capital adequacy	$	4.8	$	0.1
INTL Gainvest S.A.	CNV	Argentina	Net capital	$	2.8	$	0.1
INTL CIBSA S.A.	CNV	Argentina	Capital adequacy	$	5.2	$	0.8
INTL CIBSA S.A.	CNV	Argentina	Net capital	$	1.1	$	0.4

⁽¹⁾ INTL Netherlands BV is a holding company that includes the ownership equity of INTL FCStone Ltd. The associated net capital amounts and minimum requirements should not be considered in aggregate.

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 March 31, 2018, these subsidiaries were in compliance with their local capital adequacy requirements.