Inventories (Schedule of Inventory) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Inventories [Abstract]
Finished goods	$ 493.9	$ 527.3
Work in process	34.1	38.7
Raw materials, supplies and other	283.4	234.9
Total FIFO value	811.4	800.9
Less: Excess of FIFO cost over LIFO cost	(105.4)	(94.8)
Inventories	$ 706.0	$ 706.1