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Allowance for Doubtful Accounts - Allowance for Bad Debts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, beginning of year | $ 27.1 | $ 48.6 | $ 58.2
Provision for (recovery of) bad debts | 10.4 | 13.0 | (9.8)
Allowance charge-offs | (5.9) | (35.6) | (1.3)
Other | 0.0 | 1.1 | 1.5
Balance, end of year | 39.8 | 27.1 | 48.6
Cumulative Effect, Period of Adoption, Adjustment |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, beginning of year | 8.2 | 0.0 | 0.0
Balance, end of year |  | 8.2 | 0.0
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, beginning of year | $ 35.3 | 48.6 | 58.2
Balance, end of year |  | $ 35.3 | $ 48.6

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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