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Stock Compensation Plans (Restricted Stock Activity) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Cost Share Based Awards $ 0.9 $ 2.3  
Shares [Roll Forward]      
Nonvested 261 421  
Vested (141) (140)  
Forfeited (6) (20)  
Nonvested 114 261 421
Weighted Average Grant-Date Fair Value [Roll Forward]      
Nonvested, Weighted AVerage Grant-Date Fair Value $ 17.98 $ 18.09  
Vested 17.90 17.90  
Forfeited 18.23 16.83  
Nonvested, Weighted AVerage Grant-Date Fair Value $ 18.06 $ 17.98 $ 18.09
Restricted Stock And Share Unit [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Cost Share Based Awards $ 5.6 $ 5.0 $ 4.8
Period of recognition 11 months 7 days    
Shares [Roll Forward]      
Nonvested 1,175 767  
Granted 496 730 342
Vested (306) (269) (835)
Forfeited (58) (53) (29)
Nonvested 1,307 1,175 767
Weighted Average Grant-Date Fair Value [Roll Forward]      
Nonvested, Weighted AVerage Grant-Date Fair Value $ 11.30 $ 14.34  
Granted 12.43 8.76 $ 17.29
Vested 11.91 12.90 11.34
Forfeited 12.28 11.60 10.25
Nonvested, Weighted AVerage Grant-Date Fair Value $ 11.55 $ 11.30 $ 14.34
Vested but not distributed 528 410 275