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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Cost Share Based Awards $ 3.9    
Period of recognition 9 months 18 days    
Shares [Roll Forward]      
Nonvested 0    
Forfeited (3)    
Nonvested 215 0  
Weighted Average Grant-Date Fair Value [Roll Forward]      
Nonvested, Weighted AVerage Grant-Date Fair Value $ 0.00    
Granted 18.09    
Forfeited 18.23    
Nonvested, Weighted AVerage Grant-Date Fair Value $ 18.09 $ 0.00  
Restricted Stock And Share Unit [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Cost Share Based Awards $ 4.8 $ 14.4 $ 5.8
Period of recognition 1 year    
Shares [Roll Forward]      
Nonvested 1,289 833  
Granted 275 221 175
Vested (835) (564) (405)
Forfeited (29) (26) (118)
Nonvested 767 1,289 833
Weighted Average Grant-Date Fair Value [Roll Forward]      
Nonvested, Weighted AVerage Grant-Date Fair Value $ 12.86 $ 8.96  
Granted 17.29 15.83 $ 6.24
Vested 11.34 13.33 10.27
Forfeited 10.25 15.38 10.54
Nonvested, Weighted AVerage Grant-Date Fair Value $ 14.34 $ 12.86 $ 8.96