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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Sep. 30, 2020
Inventory Disclosure [Abstract]    
Finished goods $ 143.7 $ 134.5
Work in process 25.0 21.3
Raw materials, supplies and other 261.6 249.0
Inventories $ 430.3 $ 404.8