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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Sep. 30, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 724.6 $ 676.0
Partially finished products 330.5 244.2
Finished products 708.0 433.0
Inventories at FIFO cost 1,763.1 1,353.2
Less: Excess of FIFO cost over LIFO cost (107.2) (104.0)
Inventory net $ 1,655.9 $ 1,249.2