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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Inventories [Abstract]    
Finished goods and work in process $ 1,000.5 $ 938.9
Raw materials 825.4 818.8
Spare parts and supplies 483.9 479.7
Inventories at FIFO cost 2,309.8 2,237.4
LIFO reserve (120.1) (129.9)
Net inventories $ 2,189.7 $ 2,107.5