Discontinued Operations (Schedule of Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash items	$ 0	$ 1.1	$ 0.6
Trade receivables, net	15.0	213.4
Inventories	0.5	11.2
Other current assets	0.1	17.5
Total Current Assets	15.6	243.2
Plant and equipment, net	27.2	189.3
Goodwill	0	96.2
Other noncurrent assets	0	3.4
Total Noncurrent Assets	27.2	288.9
Payables and accrued liabilities	6.0	42.1
Accrued income taxes	0	0.5
Short-term borrowings	0	0.7
Total Current Liabilities	6.0	43.3
Other noncurrent liabilities	0.2	12.4
Deferred income taxes	0	11.9
Total Noncurrent Liabilities	$ 0.2	$ 24.3