Other (Expense) Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Other Income and Expenses [Abstract]
Interest income	$ 0.5	$ 0.5	$ 1.0	$ 0.8
Royalty income	2.8	2.5	5.5	4.6
Legacy product liability and environmental charges	(4.1)	(0.8)	(7.4)	(5.4)
Non-operating pension and postretirement benefit cost	(21.3)	(7.0)	(16.9)	(14.0)
Legal settlement	0.0	0.0	0.0	70.0
Other	(1.6)	(1.2)	(3.0)	(1.0)
Other (expense) income	$ (23.7)	$ (6.0)	$ (20.8)	$ 55.0