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Acquisitions - IFCM Commodities (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2020
Sep. 30, 2022
Sep. 30, 2020
Business Acquisition [Line Items]      
Acquired finite-lived intangible asset, weighted average useful life   1 year  
IFCM Commodities Acquisition      
Business Acquisition [Line Items]      
Percentage of stock purchased 100.00%    
Purchase price $ 1.9    
Business acquisition, premium amount $ 1.0    
Operating revenues post-acquisition results of the acquired business     $ 1.8
Net income (loss) post-acquisition results of the acquired business     $ 0.5
IFCM Commodities Acquisition | Customer base      
Business Acquisition [Line Items]      
Acquired finite-lived intangible asset, weighted average useful life 5 years