Inventories (Schedule of Inventory) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Inventories [Abstract]
Finished goods	$ 617.9	$ 477.3
Work in process	36.7	29.9
Raw materials, supplies and other	220.0	258.8
Total FIFO value	874.6	766.0
Less: Excess of FIFO cost over LIFO cost	(88.0)	(95.8)
Inventories	$ 786.6	$ 670.2