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Regulatory Requirements and Subsidiary Dividend Restrictions (Tables)
 12 Months Ended
Sep. 30, 2018
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, 2018, as follows:
(in millions)
 
 
 
 
As of September 30, 2018
Subsidiary
Regulatory Authority
 
Requirement Type
 
Actual
 
Minimum
Requirement
INTL FCStone Financial Inc.
SEC and CFTC
 
Net capital
 
$
167.7

 
$
101.4

INTL FCStone Financial Inc.
CFTC
 
Segregated funds
 
$
2,637.0

 
$
2,579.7

INTL FCStone Financial Inc.
CFTC
 
Secured funds
 
$
148.9

 
$
132.8

INTL FCStone Financial Inc.
SEC
 
Customer reserve
 
*

 
$
6.4

INTL FCStone Financial Inc.
SEC
 
PAB reserve
 
$
0.3

 
$
—

SA Stone Wealth Management Inc.
SEC
 
Net capital
 
$
4.6

 
$
0.4

INTL FCStone Ltd
FCA (United Kingdom)
 
Net capital
 
$
193.1

 
$
95.9

INTL FCStone Ltd
FCA (United Kingdom)
 
Segregated funds
 
$
187.3

 
$
182.1

INTL Netherlands BV
FCA (United Kingdom)
 
Net capital
 
$
193.0

 
$
95.9

INTL FCStone DTVM Ltda.
Brazilian Central Bank and Securities and Exchange Commission of Brazil
 
Capital adequacy
 
$
11.2

 
$
2.1

INTL Gainvest S.A.
National Securities Commission ("CNV")
 
Capital adequacy
 
$
4.2

 
$
0.1

INTL Gainvest S.A.
CNV
 
Net capital
 
$
1.2

 
$
0.1

INTL CIBSA S.A.
CNV
 
Capital adequacy
 
$
4.4

 
$
0.5

INTL CIBSA S.A.
CNV
 
Net capital
 
$
3.1

 
$
0.3