Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Effective income tax rate	18.10%	19.10%
Income tax liabilities			$ 175.3
Gross unrecognized tax benefits	$ 10.8		9.8
Accrued interest and penalties related to unrecognized tax benefits	1.0		$ 0.9
Reasonably possible amount of reduction in gross unrecognized tax benefits for the next twelve months	2.3
Reasonably possible amount of net reduction to income tax provision if unrecognized tax benefits were recognized	$ 3.1