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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Allowance for expected credit losses |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 14.4 | $ 16.8 | $ 7.5
Additions Other | 0.0 | 0.0 | 0.0
Additions Charged to Expense | 109.6 | 5.8 | 11.1
Deductions Credited and Write-Offs | (7.6) | (8.2) | (1.8)
Balance at End of Period | 116.4 | 14.4 | 16.8
Income tax valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 40.7 | 32.3 | 33.8
Additions Other | 9.5 | 0.0 | 0.0
Additions Charged to Expense | 37.8 | 9.0 | 3.0
Deductions Credited and Write-Offs | (0.3) | (0.6) | (4.5)
Balance at End of Period | $ 87.7 | $ 40.7 | $ 32.3

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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