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Receivables - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance at beginning of period | $ 9.7 | $ 10.5 | $ 11.3 | $ 9.9
Provision for doubtful accounts, net of recoveries | 3.9 | 0.8 | 2.3 | 1.4
Charge-off of accounts | (0.6) | (0.1) | (0.6) | (0.1)
Allowance at end of period | 13.0 | 11.2 | 13.0 | 11.2
Finance Receivable |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance at beginning of period | 2.0 | 2.7 | 2.2 | 2.8
Provision for doubtful accounts, net of recoveries | 1.1 | (0.3) | 0.9 | (0.4)
Allowance at end of period | 3.1 | 2.4 | 3.1 | 2.4
Notes Receivable |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance at beginning of period | 0.4 |  | 0.4 |
Charge-off of accounts | (0.4) |  | (0.4) |
Trade and Other Receivable |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance at beginning of period | 7.3 | 7.8 | 8.7 | 7.1
Provision for doubtful accounts, net of recoveries | 2.8 | 1.1 | 1.4 | 1.8
Charge-off of accounts | (0.2) | (0.1) | (0.2) | (0.1)
Allowance at end of period | $ 9.9 | $ 8.8 | $ 9.9 | $ 8.8

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