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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Sep. 30, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 785.8 $ 745.7
Partially finished products 286.9 295.2
Finished products 317.8 565.0
Inventories at FIFO cost 1,390.5 1,605.9
Less: Excess of FIFO cost over LIFO cost (117.3) (100.5)
Inventory net $ 1,273.2 $ 1,505.4