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Allowance for Doubtful Accounts
9 Months Ended
Jun. 30, 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 June 30, 2021 and September 30, 2020. The allowance for doubtful accounts related to receivables from clients was $31.3 million and $25.8 million as of June 30, 2021 and September 30, 2020, respectively. The Company had no allowance for doubtful accounts related to notes receivable as of June 30, 2021 and September 30, 2020.
Activity in the allowance for doubtful accounts for the nine months ended June 30, 2021 was as follows:
(in millions)
Balance as of September 30, 2020$27.1 
ASU 2016-13 cumulative transition adjustment8.2 
Adjusted balance as of September 30, 202035.3 
Provision for bad debts3.7 
Allowance charge-offs(6.4)
Balance as of June 30, 2021$32.6