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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Inventory Disclosure [Abstract]    
Finished goods $ 173.5 $ 150.7
Work in process 22.3 24.0
Raw materials, supplies and other 311.7 279.2
Inventories $ 507.5 $ 453.9