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Physical Commodities Inventory -Narrative (Details)
bu in Millions, $ in Millions
Oct. 06, 2021
USD ($)
bu
Sep. 30, 2021
USD ($)
bu
Sep. 30, 2020
USD ($)
Inventory [Line Items]      
Physical Ag & Energy   $ 248.6 $ 201.5
Soybeans      
Inventory [Line Items]      
Agricultural related inventory | bu   2.6  
Physical Ag & Energy   $ 31.2  
Soybeans | Subsequent Event      
Inventory [Line Items]      
Agricultural related inventory | bu 2.8    
Inventory, firm purchase commitment $ 2.5    
Physical precious metals trading      
Inventory [Line Items]      
Inventory adjustments   $ 3.5 0.7
Crude Oil And Low Sulfur Fuel Oil      
Inventory [Line Items]      
Inventory adjustments     $ 7.6