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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 7.5 $ 4.2 $ 3.6
Reserves Acquired 0.0 0.0 0.0
Additions Charged to Expense 11.1 7.2 1.4
Deductions Credited and Write-Offs (1.8) (3.9) (0.8)
Balance at End of Period 16.8 7.5 4.2
Income tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 33.8 35.8 33.6
Reserves Acquired 0.0 0.0 0.0
Additions Charged to Expense 3.0 0.5 2.4
Deductions Credited and Write-Offs (4.5) (2.5) (0.2)
Balance at End of Period $ 32.3 $ 33.8 $ 35.8