Discontinued Operations (Schedule of Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash items	$ 0		$ 13.5
Trade receivables, net	12.7	15.0
Inventories	0.4	0.5
Other current assets	0	0.1
Total Current Assets	13.1	15.6
Plant and equipment, net	22.3	27.2
Total Noncurrent Assets	22.3	27.2
Payables and accrued liabilities	5.2	6.0
Total Current Liabilities	5.2	6.0
Other noncurrent liabilities	0	0.2
Total Noncurrent Liabilities	$ 0	$ 0.2