Other Income (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other Income and Expenses [Abstract]
Interest income	$ 5.0	$ 1.3
Royalty income	2.8	2.5
Legacy product liability and environmental charges	(5.0)	(2.8)
Non-operating pension and postretirement benefit credit	4.9	12.4
Other	$ 1.2	$ 3.9