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Equity Incentive Programs (Schedule of Stock Option Activity Roll Forward) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Deferred Stock Units (DSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 0.9 $ 0.9  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 0.0 $ 0.0  
Shares Under Option      
Outstanding at beginning of period (in shares) 1,532,033    
Granted (in shares) 0 0  
Exercised (in shares) (271,859)    
Canceled/forfeited/expired (in shares) (295,679)    
Outstanding at end of period (in shares) 964,495   1,532,033
Exercisable (in shares) 964,495    
Weighted Average Exercise Price      
Outstanding at beginning of period (in dollars per share) $ 23.60    
Granted (in dollars per share) 0.00    
Exercised (in dollars per share) 14.78    
Canceled/forfeited/expired (in dollars per share) 29.66    
Outstanding at end of period (in dollars per share) 24.23   $ 23.60
Exercisable (in dollars per share) $ 24.23    
Weighted Average Remaining Contractual Term (years)      
Outstanding at beginning of period (in years) 2 years 6 months   2 years 4 months
Outstanding at end of period (in years) 2 years 6 months   2 years 4 months
Exercisable (in years) 2 years 6 months    
Aggregate Intrinsic Value (millions)      
Outstanding at beginning of period $ 6.8    
Outstanding at end of period 6.4   $ 6.8
Exercisable $ 6.4