Inventory (Schedule Of Inventories) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Inventory, Net [Abstract]
Raw materials	$ 80.7	$ 81.3
Work-in-process	762.5	805.3
Finished goods	411.2	322.5
Finished goods held on consignment by customers	2.6	3.0
Total inventory	$ 1,257.0	$ 1,212.1