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Receivables - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for doubtful accounts at beginning of year | $ 9.6 | $ 11.3
Provision for doubtful accounts, net of recoveries | (5.5) | (0.6)
Charge-off of accounts | (0.5) | (1.1)
Allowance for doubtful accounts at end of year | 3.6 | 9.6
Finance Receivable |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for doubtful accounts at beginning of year | 2.7 | 2.2
Provision for doubtful accounts, net of recoveries | (2.1) | 0.5
Allowance for doubtful accounts at end of year | 0.6 | 2.7
Notes Receivables |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for doubtful accounts at beginning of year |  | 0.4
Charge-off of accounts |  | (0.4)
Trade and Other Receivables |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for doubtful accounts at beginning of year | 6.9 | 8.7
Provision for doubtful accounts, net of recoveries | (3.4) | (1.1)
Charge-off of accounts | (0.5) | (0.7)
Allowance for doubtful accounts at end of year | $ 3.0 | $ 6.9

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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