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Acquisitions and Disposals (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Jan. 01, 2015
Feb. 28, 2013
Business Acquisition [Line Items]                          
Gross Profit $ 178.7 $ 151.6 $ 156.5 $ 137.5 $ 130.6 $ 118.2 $ 129.2 $ 112.9 $ 624.3 $ 490.9 $ 468.2    
Net income $ 21.1 $ 12.2 $ 13.0 $ 9.4 $ 5.8 $ 3.5 $ 7.5 $ 2.5 $ 55.7 $ 19.3 $ 19.3    
Net basic earnings per share $ 1.12 $ 0.64 $ 0.68 $ 0.50 $ 0.30 $ 0.19 $ 0.39 $ 0.13 $ 2.94 $ 1.01 $ 1.01    
Net diluted earnings per share $ 1.09 $ 0.62 $ 0.67 $ 0.49 $ 0.29 $ 0.18 $ 0.39 $ 0.12 $ 2.87 $ 0.98 $ 0.97    
Goodwill, Expected Tax Deductible Amount $ 1.6       $ 0.3       $ 1.6 $ 0.3 $ 4.7    
Goodwill 47.5       $ 47.5       47.5 47.5      
Finite-lived Intangible Assets Acquired                 1.6        
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds                         $ 0.8
Assets of Disposal Group, Including Discontinued Operation                         $ 0.6
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, before Tax                 0.0 0.0 0.1    
Deferred consideration payable related to acquisitions                 5.0 0.0 $ 0.0    
G.X. Clarke (INTL FCStone Partners) [Member]                          
Business Acquisition [Line Items]                          
Present Value of Estimated Total Purchase Price 27.5               27.5        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 25.9               25.9        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 1.5               1.5        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 1.5               1.5     $ 0.1  
Forward Insight Commodities Acquisition [Member]                          
Business Acquisition [Line Items]                          
Present Value of Estimated Total Purchase Price 0.5               0.5        
Tradewire Acquisition [Member]                          
Business Acquisition [Line Items]                          
Present Value of Estimated Total Purchase Price 4.4               4.4        
Goodwill 2.8               2.8        
Customer Relationships [Member] | Tradewire Acquisition [Member]                          
Business Acquisition [Line Items]                          
Finite-lived Intangible Assets Acquired                 2.8        
Customer Relationships [Member] | Forward Insight Commodities [Member]                          
Business Acquisition [Line Items]                          
Finite-lived Intangible Assets Acquired                 0.5        
Tradewire Acquisition [Member] | Tradewire Acquisition [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Consideration Transferred                 5.6        
G.X. Clarke (INTL FCStone Partners) [Member]                          
Business Acquisition [Line Items]                          
Escrow Deposit 10.0               10.0        
Adjustment Escrow 5.0               5.0        
Indemnity Escrow 5.0               5.0        
Deferred consideration payable related to acquisitions                 5.0        
Business Acquisition, Contingent Consideration, Potential Cash Payment, Year One 0.5               0.5        
After-tax net income over year one                 5.0        
Business Acquisition, Contingent Consideration, Potential Cash Payment Year Three $ 1.0               1.0        
After-tax net income over earn-out period                 30.0        
INTL FCStone Partners LP [Member]                          
Business Acquisition [Line Items]                          
Gross Profit       $ 8.7         31.4 41.9      
Net income       $ 0.7         4.3 $ 5.1      
Net basic earnings per share       $ 0.04           $ 0.27      
Net diluted earnings per share       $ 0.04           $ 0.27      
INTL FCStone Inc. [Member]                          
Business Acquisition [Line Items]                          
Gross Profit                 633.0 $ 532.8      
Net income                 $ 56.4 $ 24.4      
Net basic earnings per share                 $ 2.98 $ 1.28      
Net diluted earnings per share                 $ 2.91 $ 1.25