Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income tax expense	$ 12.9	$ 15.6	$ 39.8	$ 31.7
Effective Income Tax Rate Reconciliation, Percent	25.00%	25.00%	24.60%	25.10%
Deferred Tax Liabilities, Gross	$ 52.0		$ 52.0		$ 49.8
Deferred Tax Assets, Valuation Allowance	0.8		0.8		0.9
Deferred tax liability, net	$ 52.8		$ 52.8		$ 50.7