Other Income (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Other Income and Expenses [Abstract]
Interest income	$ 4.0	$ 5.0
Royalty income	3.0	3.0
Legacy product liability and environmental charges	(3.0)	(5.0)
Non-operating pension and postretirement benefit credit	0.0	5.0
Other	2.0	1.0
Other income	$ 6.0	$ 9.0