Discontinued Operations (Schedule of Operating Results) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales	$ 258.0	$ 408.3	$ 409.9
Income before taxes	68.1	114.1	121.3
Income tax provision	20.8	24.2	33.8
Income from operations of discontinued operations	47.3	89.9	87.5
Gain on sale of business and impairment/write-down, net of tax	120.8	0	0
Income from Discontinued Operations, net of tax	$ 168.1	$ 89.9	$ 87.5