Inventories (Schedule of Inventory) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Inventories [Abstract]
Finished goods	$ 517.2	$ 527.3
Work in process	37.7	38.7
Raw materials, supplies and other	234.9	234.9
Total FIFO value	789.8	800.9
Less: Excess of FIFO cost over LIFO cost	(96.4)	(94.8)
Inventories	$ 693.4	$ 706.1