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Treasury Stock (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items]    
Treasury stock purchase plan $ 40.0  
Treasury stock purchase plan remaining available 7.2  
Stock Repurchased and Retired During Period, Shares $ 15.4 $ 5.6
Shares Paid for Tax Withholding for Share Based Compensation 20,261  
Payments Related to Tax Withholding for Share-based Compensation $ 1.9 1.5
Value of option exercises with shares remitted to the company in lieu of cash payment   $ 0.1
Restricted Stock [Member]    
Equity, Class of Treasury Stock [Line Items]    
Shares Paid for Tax Withholding for Share Based Compensation   17,299
Employee Stock Option [Member]    
Equity, Class of Treasury Stock [Line Items]    
Shares Paid for Tax Withholding for Share Based Compensation   823