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Regulatory Requirements and Subsidiary Dividend Restrictions (Tables)
 12 Months Ended
Sep. 30, 2019
Capital and Other Regulatory Requirements [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
with a minimum net capital requirement in excess of $5.0 million as well as the actual regulatory capital of the subsidiary as of September 30, 2019 (in millions):
Subsidiary
Regulatory Authority
Actual
 
Minimum
Requirement
INTL FCStone Financial Inc.
SEC and CFTC
$
170.1

 
$
97.5

INTL FCStone Ltd
FCA
$
231.7

 
$
123.3