Other Income (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Other Income and Expenses [Abstract]
Interest income	$ 0.5	$ 0.3
Royalty income	2.7	2.1
Legacy product liability and environmental charges	(3.2)	(4.6)
Non-operating pension and postretirement benefit credit (cost)	4.4	(7.0)
Legal settlement	0.0	70.0
Other	(1.5)	0.2
Other income	$ 2.9	$ 61.0