Commitment and Contingencies - Additional Information (Details) $ in Millions	1 Months Ended
	Apr. 30, 2019 Complaint	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)
Commitments And Contingencies [Line Items]
Reserve for unpaid and incurred but not reported claims, amount		$ 149.3	$ 151.1
Reserve for unpaid and incurred but not reported claims, classified in current liabilities		49.1	48.4
Reserve for unpaid and incurred but not reported claims, classified in non-current liabilities		100.2	102.7
Claims recoverable from third party insurance carriers		34.2	34.1
Number of purported class action complaints | Complaint	2
Other Current Assets
Commitments And Contingencies [Line Items]
Claims recoverable from third party insurance carriers		11.2	8.1
Other Assets
Commitments And Contingencies [Line Items]
Claims recoverable from third party insurance carriers		$ 23.0	$ 26.0