Other Income (Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Income and Expenses [Abstract]
Interest income	$ 1.5	$ 0.6	$ 4.1	$ 1.6
Royalty income	3.4	3.1	9.3	8.6
Legacy product liability and environmental (charges) benefit	(4.8)	0.8	(10.7)	(6.6)
Non-operating pension and postretirement credit (cost)	5.5	11.9	(87.5)	(5.0)
Other	0.9	3.4	1.5	0.4
Other income (expense)	$ 6.5	$ 19.8	$ (83.3)	$ (1.0)