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Credit Facilities (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Jul. 26, 2016
Sep. 30, 2015
May 05, 2015
Apr. 15, 2015
Line of Credit Facility [Line Items]          
Short-term Debt $ 180.0   $ 38.0    
Payables to lenders under loans 182.8   41.6    
Notes Payable to Bank 2.8   3.6   $ 4.0
Senior Notes $ 45.5   45.5    
Debt Instrument, Interest Rate, Stated Percentage 8.50%        
Debt Instrument, Call Feature, Redemption Price Percentage of Principal 100.00%        
Debt Issuance Cost $ 1.7        
Debt and Capital Lease Obligations $ 228.3   87.1    
HCO Syndicated line of credit facility [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Interest Rate at Period End 5.25%        
Line of Credit Facility, Maximum Borrowing Capacity $ 247.0        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.625%        
Payables to lenders under loans $ 136.5   28.0    
Debt Issuance Cost $ 1.8        
INTL FCStone Financial Margin line of credit facility [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Interest Rate at Period End 5.50%        
Line of Credit Facility, Maximum Borrowing Capacity $ 75.0 $ 25.0   $ 50.0  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%        
Payables to lenders under loans $ 0.0   0.0    
INTL FCStone Financial [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 0.0        
Payables to lenders under loans $ 0.0   0.0    
FMS Sub-note commodity line of credit facility [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Interest Rate at Period End 4.25%        
Line of Credit Facility, Maximum Borrowing Capacity $ 100.0        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%        
Payables to lenders under loans $ 43.5   10.0    
INTL FCStone, Ltd [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 25.0        
Payables to lenders under loans 0.0   $ 0.0    
Main line of credit facilities [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 447.0        
Line of Credit Facility, Current Borrowing Capacity $ 75.0        
Base Rate [Member] | HCO Syndicated line of credit facility [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.00%        
Base Rate [Member] | INTL FCStone Financial Margin line of credit facility [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.00%        
Base Rate [Member] | Sterne Agee [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.00%        
Base Rate [Member] | INTL FCStone, Ltd [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.50%