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Allowance for Doubtful Accounts
3 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Allowance for Doubtful Accounts Allowance for Doubtful Accounts
The allowance for doubtful accounts related to deposits with and receivables from broker-dealers, clearing organizations, and counterparties was $1.3 million as of December 31, 2021 and September 30, 2021. The allowance for doubtful accounts related to receivables from clients was $38.3 million and $38.5 million as of December 31, 2021 and September 30, 2021, respectively. The Company had no allowance for doubtful accounts related to notes receivable as of December 31, 2021 and September 30, 2021.
Activity in the allowance for doubtful accounts for the three months ended December 31, 2021 was as follows:
(in millions)
Balance as of September 30, 2021$39.8 
Recovery of bad debts(0.2)
Balance as of December 31, 2021$39.6