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Equity Incentive Programs (Schedule of Stock Option Activity Rollforward) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total future compensation expense $ 15,900,000    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Compensation expense recognized $ 0 $ 0 $ 0
Total future compensation expense $ 0    
Shares Under Option      
Options exercisable (in shares) 1,532,033 1,702,866  
Outstanding, beginning of year, Shares Under Option (in shares) 1,532,033    
Granted, Shares Under Option (in shares) 0 0 0
Exercised, Shares Under Option (in shares) (282,661)    
Canceled/forfeited/expired, Shares Under Option (in shares) (307,057)    
Outstanding, end of year, Shares Under Option (in shares) 942,315 1,532,033  
Weighted Average Exercise Price      
Options exercisable (in dollars per share) $ 23.60 $ 23.00  
Outstanding, beginning of year, Weighted Average Exercise Price (in dollars per share) 23.60    
Granted, Weighted Average Exercise Price (in dollars per share) 0.00    
Exercised, Weighted Average Exercise Price (in dollars per share) 14.78    
Canceled/forfeited/expired, Weighted Average Exercise Price (in dollars per share) 29.54    
Outstanding, end of year, Weighted Average Exercise Price (in dollars per share) $ 24.31 $ 23.60  
Weighted Average Remaining Contractual Term (years)      
Options exercisable 1 year 9 months 2 years 4 months  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2 years 4 months 3 years 4 months  
Aggregate Intrinsic Value (millions)      
Options exercisable $ 6,800,000 $ 12,300,000  
Outstanding, Aggregate Intrinsic Value $ 0 $ 6,800,000  
Stock Options | Annual Anniversary Grant Date of Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options expiration date 10 years    
Stock Options | Termination for Death      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options expiration date 24 months    
Stock Options | Termination for Retirement or Disability      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options expiration date 36 months    
Stock Options | Employment Terminated, Any Other Reason      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options expiration date 90 days    
Stock Options | Vested in first year      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of options vested 0.00%    
Stock Options | Vested in second year      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of options vested 33.33%    
Stock Options | Vested in third year      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of options vested 33.33%    
Stock Options | Vested in fourth year      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of options vested 33.34%