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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 7.5 | $ 4.2 | $ 3.6
Reserves Acquired | 0.0 | 0.0 | 0.0
Additions Charged to Expense | 11.1 | 7.2 | 1.4
Deductions Credited and Write-Offs | (1.8) | (3.9) | (0.8)
Balance at End of Period | 16.8 | 7.5 | 4.2
Income tax valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 33.8 | 35.8 | 33.6
Reserves Acquired | 0.0 | 0.0 | 0.0
Additions Charged to Expense | 3.0 | 0.5 | 2.4
Deductions Credited and Write-Offs | (4.5) | (2.5) | (0.2)
Balance at End of Period | $ 32.3 | $ 33.8 | $ 35.8

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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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