Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income tax expense	$ 15.6	$ 13.0	$ 31.7	$ 41.4
Effective Income Tax Rate Reconciliation, Percent	25.00%	24.70%	25.10%	24.40%
Deferred Income Tax Liabilities, Net of Deferred Income Tax Assets	$ (33.2)		$ (33.2)		$ (35.9)
Deferred Tax Assets, Valuation Allowance	0.9		0.9		1.0
Deferred tax liability, net	$ (34.1)		$ (34.1)		$ (36.9)