Inventories (Schedule of Inventory) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Sep. 30, 2025
Inventory Disclosure [Abstract]
Finished goods	$ 192.8	$ 191.9
Work in process	54.0	42.4
Raw materials, supplies, and other	504.8	542.2
Inventories	$ 751.6	$ 776.5