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Receivables - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance at beginning of period | $ 5.7 | $ 13.0 | $ 9.6 | $ 11.3
Provision for doubtful accounts, net of recoveries | (0.9) | (1.6) | (4.8) | 0.7
Charge-off of accounts | (0.1) | (0.3) | (0.1) | (0.9)
Allowance at end of period | 4.7 | 11.1 | 4.7 | 11.1
Finance Receivables |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance at beginning of period | 1.1 | 3.1 | 2.7 | 2.2
Provision for doubtful accounts, net of recoveries | (0.2) | 0.1 | (1.8) | 1.0
Allowance at end of period | 0.9 | 3.2 | 0.9 | 3.2
Notes Receivable |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance at beginning of period |  |  |  | 0.4
Charge-off of accounts |  |  |  | (0.4)
Trade and Other Receivables |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance at beginning of period | 4.6 | 9.9 | 6.9 | 8.7
Provision for doubtful accounts, net of recoveries | (0.7) | (1.7) | (3.0) | (0.3)
Charge-off of accounts | (0.1) | (0.3) | (0.1) | (0.5)
Allowance at end of period | $ 3.8 | $ 7.9 | $ 3.8 | $ 7.9

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