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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Allowance for expected credit losses      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 11.5 $ 116.4 $ 14.4
Additions Other 0.0 0.0 0.0
Additions Charged to Expense 9.0 3.7 109.6
Deductions Credited and Write-Offs (4.5) (108.6) (7.6)
Balance at End of Period 16.0 11.5 116.4
Income tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 96.5 87.7 40.7
Additions Other 0.5 3.6 9.5
Additions Charged to Expense 12.0 13.7 37.8
Deductions Credited and Write-Offs (12.2) (8.5) (0.3)
Balance at End of Period $ 96.8 $ 96.5 $ 87.7