Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	21.00%	21.00%
Charge related to effects of Non US Jurisdiction unrecognized tax benefit		$ 35.3
Unrecognized tax benefits	$ 21.8		$ 21.2
Income tax provision upon recognition of unrecognized tax benefit	21.8
Unrecognized tax benefits that would impact valuation allowance	4.7
Potential decrease in unrecognized tax benefits	$ 1.0