Commitment and Contingencies - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Commitments And Contingencies [Line Items]
Reserve for unpaid and incurred but not reported claims, amount	$ 159.9	$ 146.7
Reserve for unpaid and incurred but not reported claims, classified in current liabilities	54.8	45.6
Reserve for unpaid and incurred but not reported claims, classified in non-current liabilities	105.1	101.1
Claims recoverable from third party insurance carriers	18.1	17.9
Other Current Assets
Commitments And Contingencies [Line Items]
Claims recoverable from third party insurance carriers	5.3	5.1
Other Assets
Commitments And Contingencies [Line Items]
Claims recoverable from third party insurance carriers	$ 12.8	$ 12.8