Inventories (Schedule of Inventory) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Inventories [Abstract]
Finished goods	$ 530.8	$ 617.9
Work in process	35.5	36.7
Raw materials, supplies and other	234.4	220.0
Total FIFO value	800.7	874.6
Less: Excess of FIFO cost over LIFO cost	(94.8)	(88.0)
Inventories	$ 705.9	$ 786.6