Income Taxes (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2017	Sep. 30, 2016
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 3.9	$ 3.9
Unrecognized tax benefits, income tax penalties and interest accrued	$ 2.6	$ 2.3
Minimum
Income Tax Contingency [Line Items]
Number of years open for tax examinations	3 years
Maximum
Income Tax Contingency [Line Items]
Number of years open for tax examinations	5 years