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Receivables From Customers, Net and Notes Receivable, Net Receivables from Customers, Net and Notes Receivables, Net - Bad Debt Expense and Recoveries (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Document Period End Date     Jun. 30, 2020  
Bad debts $ 1.8 $ 0.5 $ 6.2 $ 1.5
Payments for Legal Settlements       8.4
Recovery of bad debt on physical coal 0.0 $ 0.0 0.0 $ 2.4
Commodity and Risk Management [Member]        
Bad debts 1.1   3.3  
Accounts Receivable, Allowance for Credit Loss, Recovery 0.6      
Clearing and Execution Services Segment        
Bad debts $ 2.4   2.7  
Physical Commodities        
Bad debts     $ 0.2