Income Taxes (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 1.8	$ 1.8
Unrecognized tax benefits, income tax penalties and interest accrued	$ 0.7	$ 0.7
Number of years open for tax examinations			3 years	5 years