Inventory (Other Disclosures) (Details) (Natural Disasters and Other Casualty Events, USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Natural Disasters and Other Casualty Events
Extraordinary Item [Line Items]
Inventory, damaged by Thailand flood, writedown (recovery)	$ 0.1	$ 4.0