Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Income Tax Contingency [Line Items]
Effective income tax rate	14.00%	13.00%
Statutory income tax rate		35.00%
Unrecognized tax benefits	$ 8.3	$ 8.3
Unrecognized tax benefits that would impact the effective tax rate	8.3	8.3
Other long-term liabilities [Member]
Income Tax Contingency [Line Items]
Estimated accrued interest and penalties	$ 2.7	$ 2.7