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