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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Sep. 30, 2015
Inventories [Abstract]    
Finished goods $ 474.7 $ 494.9
Work in process 38.1 34.4
Raw materials, supplies and other 229.6 229.3
Total FIFO value 742.4 758.6
Less: Excess of FIFO cost over LIFO cost (92.6) (100.8)
Inventories $ 649.8 $ 657.8