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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
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