Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Allowance for doubtful accounts | |||
| SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | |||
| Balance at Beginning of Period | $ 16.8 | $ 7.5 | $ 4.2 |
| Reserves Acquired | 0.0 | 0.0 | 0.0 |
| Additions Charged to Expense | 5.8 | 11.1 | 7.2 |
| Deductions Credited and Write-Offs | (8.2) | (1.8) | (3.9) |
| Balance at End of Period | 14.4 | 16.8 | 7.5 |
| Income tax valuation allowance | |||
| SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | |||
| Balance at Beginning of Period | 32.3 | 33.8 | 35.8 |
| Reserves Acquired | 0.0 | 0.0 | 0.0 |
| Additions Charged to Expense | 9.0 | 3.0 | 0.5 |
| Deductions Credited and Write-Offs | (0.6) | (4.5) | (2.5) |
| Balance at End of Period | $ 40.7 | $ 32.3 | $ 33.8 |