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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Allowance for expected credit losses |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 116.4 | $ 14.4 | $ 16.8
Additions Other | 0.0 | 0.0 | 0.0
Additions Charged to Expense | 3.7 | 109.6 | 5.8
Deductions Credited and Write-Offs | (108.6) | (7.6) | (8.2)
Balance at End of Period | 11.5 | 116.4 | 14.4
Income tax valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 87.7 | 40.7 | 32.3
Additions Other | 3.6 | 9.5 | 0.0
Additions Charged to Expense | 13.7 | 37.8 | 9.0
Deductions Credited and Write-Offs | (8.5) | (0.3) | (0.6)
Balance at End of Period | $ 96.5 | $ 87.7 | $ 40.7

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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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