Commitment and Contingencies - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Commitments And Contingencies [Line Items]
Reserve for unpaid and incurred but not reported claims, amount	$ 144.5	$ 146.7
Reserve for unpaid and incurred but not reported claims, classified in current liabilities	46.5	45.6
Reserve for unpaid and incurred but not reported claims, classified in non-current liabilities	98.0	101.1
Claims recoverable from third party insurance carriers	14.6	17.9
Other Current Assets
Commitments And Contingencies [Line Items]
Claims recoverable from third party insurance carriers	4.2	5.1
Other Assets
Commitments And Contingencies [Line Items]
Claims recoverable from third party insurance carriers	$ 10.4	$ 12.8