Inventories (Schedule of Inventory) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Inventories [Abstract]
Finished goods	$ 514.5	$ 527.3
Work in process	37.9	38.7
Raw materials, supplies and other	234.3	234.9
Total FIFO value	786.7	800.9
Less: Excess of FIFO cost over LIFO cost	(96.5)	(94.8)
Inventories	$ 690.2	$ 706.1