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Allowance for Doubtful Accounts (Tables) | 12 Months Ended
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Sep. 30, 2021
Receivables [Abstract] |
Schedule of Allowance for Doubtful Accounts | Activity in the allowance for doubtful accounts for the years ended September 30, 2021, 2020, and 2019 was as follows:
(in millions) | 2021 |  | 2020 |  | 2019
Balance, beginning of year | $ | 27.1 |  |  | $ | 48.6 |  |  | $ | 58.2 |
ASU 2016-13 cumulative transition adjustment | 8.2 |  |  | — |  |  | — |
Adjusted balance, beginning of year | 35.3 |  |  | 48.6 |  |  | 58.2 |
Provision for (recovery of) bad debts | 10.4 |  |  | 13.0 |  |  | (9.8) |
Allowance charge-offs | (5.9) |  |  | (35.6) |  |  | (1.3) |
Other(1) | — |  |  | 1.1 |  |  | 1.5 |
Balance, end of year | $ | 39.8 |  |  | $ | 27.1 |  |  | $ | 48.6 |
(1) Allowance increase is related to a recoverable amount due from an affiliated party and recorded in Other assets on the Consolidated Balance Sheets.

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