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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Income Tax Contingency [Line Items]      
Unrecognized tax benefits that would impact effective tax rate $ 3.9   $ 1.8
Unrecognized tax benefits, income tax penalties and interest accrued $ 2.4 $ 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