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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Inventory Disclosure [Abstract]    
Finished goods $ 150.7 $ 134.5
Work in process 24.0 21.3
Raw materials, supplies and other 279.2 249.0
Inventories $ 453.9 $ 404.8