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Equity Incentive Programs (Deferred Stock Unit Activity) (Details) - Deferred Stock Units (DSUs) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Units      
Outstanding, Units, beginning balance (in shares) 195,913    
Granted, Units (in shares) 39,360    
Dividend equivalents granted, Units (in shares) 13,875    
Settled, Units (in shares) (12,587)    
Outstanding, Units, ending balance (in shares) 236,561 195,913  
Weighted- Average Grant Date Fair Value Per Share      
Outstanding, beginning of year, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) $ 18.18    
Granted, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 22.60    
Dividend equivalents granted, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 19.55    
Settled, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 10.56    
Outstanding, end of year, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) $ 19.40 $ 18.18  
Number of shares each deferred stock unit will convert to upon the earlier of the separation date of the grantee or the second anniversary of the grant date 1    
Compensation expense recognized $ 0.9 $ 0.9 $ 0.8