Inventories (Schedule of Inventory) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Inventories [Abstract]
Finished goods	$ 501.9	$ 527.3
Work in process	35.5	38.7
Raw materials, supplies and other	224.4	234.9
Total FIFO value	761.8	800.9
Less: Excess of FIFO cost over LIFO cost	(96.5)	(94.8)
Inventories	$ 665.3	$ 706.1