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Receivables - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for doubtful accounts at beginning of year | $ 11.3 | $ 9.9
Provision for doubtful accounts, net of recoveries | (0.6) | 1.8
Charge-off of accounts | (1.1) | (0.4)
Allowance for doubtful accounts at end of year | 9.6 | 11.3
Finance Receivable |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for doubtful accounts at beginning of year | 2.2 | 2.8
Provision for doubtful accounts, net of recoveries | 0.5 | (0.6)
Allowance for doubtful accounts at end of year | 2.7 | 2.2
Notes Receivable |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for doubtful accounts at beginning of year | 0.4 |
Provision for doubtful accounts, net of recoveries |  | 0.4
Charge-off of accounts | (0.4) |
Allowance for doubtful accounts at end of year |  | 0.4
Trade and Other Receivable |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for doubtful accounts at beginning of year | 8.7 | 7.1
Provision for doubtful accounts, net of recoveries | (1.1) | 2.0
Charge-off of accounts | (0.7) | (0.4)
Allowance for doubtful accounts at end of year | $ 6.9 | $ 8.7

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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=121599337&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=121611835&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=121599337&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=121599878&loc=SL82895884-210446 + Details
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