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Acquisitions - UOB Bullion and Futures Limited (Details) - USD ($)
$ in Millions
7 Months Ended 12 Months Ended
Oct. 07, 2019
Mar. 31, 2019
Oct. 07, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition [Line Items]          
Purchase price allocated to goodwill       $ 54.7 $ 51.2
Acquired finite-lived intangible asset, weighted average useful life       1 year  
UOB Bullion and Futures Limited [Member]          
Business Acquisition [Line Items]          
Purchase price $ 2.5 $ 2.5 $ 5.0    
Payable to clients 351.8   351.8    
Purchase price allocated to property and equipment acquired 0.8        
Purchase price allocated to client base intangible assets acquired 3.1        
Purchase price allocated to goodwill $ 1.1   $ 1.1    
Operating revenues post-acquisition results of the acquired business       $ 10.3  
Net income (loss) post-acquisition results of the acquired business       $ (1.4)  
UOB Bullion and Futures Limited [Member] | Client Base Intangible Assets [Member]          
Business Acquisition [Line Items]          
Acquired finite-lived intangible asset, weighted average useful life 5 years