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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
May 24, 2016
May 22, 2007
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock authorized to be issued under plan (in shares) 3,800,000.0      
Unrecognized pre-tax compensation cost     $ 9.3  
Weighted average recognition period (in years)     2 years 4 months 24 days  
Total intrinsic value of options exercised during period     $ 4.2 $ 4.3
Cash received from options exercised during period     1.7 $ 1.7
2007 Long-Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock authorized to be issued under plan (in shares) 400,000.0 3,281,250    
Exercise price of shares granted may not be less than fair market value (percentage)   100.00%    
Unrecognized pre-tax compensation cost     $ 7.4  
Weighted average recognition period (in years)     1 year 10 months 24 days  
2016 Long-Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock authorized to be issued under plan (in shares) 3,400,000.0      
Exercise price of shares granted may not be less than fair market value (percentage) 100.00%      
Restricted Stock | 2007 Long-Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual vesting period     20.00%  
Director | Options Granted on or after May 25, 2004 | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual vesting period     33.33%