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Commitments and Contingencies (Details)
bu in Millions, $ in Millions
1 Months Ended
Nov. 30, 2018
account
Mar. 31, 2022
USD ($)
bu
Sep. 30, 2021
USD ($)
Loss Contingencies [Line Items]      
Loss contingency, range of possible loss, portion not accrued   $ 28.1  
Maximum amount of individual accounts receivable account   1.4  
Accrual   8.0  
Self insurance reserve   $ 1.3  
Cumulative Effect, Period of Adoption, Adjustment      
Loss Contingencies [Line Items]      
Retained earnings, before tax     $ 8.2
StoneX Financial      
Loss Contingencies [Line Items]      
Number of accounts | account 300    
Soybeans      
Loss Contingencies [Line Items]      
Agricultural related inventory (in bushels) | bu   2.8  
Allowance against any potential uncovered shortfall   $ 3.0  
Receivables from customers   $ 31.6