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Receivables - Schedule of Finance Receivable Aging and Accrual Status (Details) - Finance Receivable - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
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Accounts Notes And Loans Receivable [Line Items] |  |
Receivables on nonaccrual status | $ 0.0 | $ 0.2
Receivables past due 90 days or more and still accruing | 0.0 | 0.0
Receivables subject to general reserves | 5.9 | 16.3
Allowance for doubtful accounts | (0.1) | (0.4)
Receivables subject to specific reserves | 0.5 | 2.5
Allowance for doubtful accounts | $ (0.5) | $ (2.3)

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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