Acquisitions (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Customer relationships [Member] Year	Sep. 30, 2009 Customer relationships [Member] Year	Sep. 30, 2011 Technology [Member] Year	Sep. 30, 2009 Technology [Member] Year	Sep. 30, 2011 Trademarks [Member] Year	Sep. 30, 2011 Other Intangible assets [Member] Year	Sep. 30, 2009 Other Intangible assets [Member] Year
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price allocation amount			$ 14.3	$ 6.3	$ 1.5	$ 1.2	$ 1.3	$ 0.6	$ 1.3
Weighted average useful life (in years)			14	10	10	8	2	4	4
Acquisitions (Textuals) [Abstract]
Liabilities incurred	10.9
Total purchase price	58.8	30.7
Goodwill	34.8	13.6
Goodwill expected to be deductible for tax purposes	$ 0	$ 5.9