Capitalized Software Costs (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
Property, Plant and Equipment, Gross [Abstract]
Capitalized computer software, gross	$ 29.4		$ 29.4		$ 26.9
Capitalized computer software costs	0.7	$ 1.2	2.6	$ 2.8
Software Development
Property, Plant and Equipment, Gross [Abstract]
Capitalized computer software, gross	$ 10.8		$ 10.8