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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock Issued [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance (in shares) at Dec. 31, 2012   31,209,866   8,760    
Balance at Dec. 31, 2012 $ 511.8 $ 3.1 $ 41.0 $ (0.3) $ 483.4 $ (15.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 76.1       76.1  
Other comprehensive loss, net of tax 10.4         10.4
Dividends declared (39.5)       (39.5)  
Restricted stock issuances, net (in shares)   226,461   (5,000)    
Restricted stock issuances, net 0.0   (0.2) $ 0.2    
Stock-based employee compensation expense 3.2   3.2      
Excess tax benefits of stock-based employee compensation 0.5   0.5      
Stock issued to directors as compensation (in shares)   1,318        
Stock issued to directors as compensation 0.1   0.1      
Issuance of shares for options exercised (in shares)   33,000        
Issuance of shares for options exercised 0.5   0.5      
Share reissuance and cancellation to fulfill stock split (in shares)   (47,218)   (47,218)    
Share reissuance and cancellation to fulfill stock split 0.0 $ 0.0 (1.8) $ 1.8    
Purchases of treasury stock (in shares)       43,458    
Purchases of treasury stock (1.7)     $ (1.7)    
Balance (in shares) at Dec. 31, 2013   31,423,427   0    
Balance at Dec. 31, 2013 561.4 $ 3.1 43.3 $ 0.0 520.0 (5.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 89.7       89.7  
Other comprehensive loss, net of tax (71.5)         (71.5)
Dividends declared (44.5)       (44.5)  
Restricted stock issuances, net (in shares)   201,005        
Restricted stock issuances, net 0.0 $ 0.0 0.0      
Stock-based employee compensation expense 5.8   5.8      
Excess tax benefits of stock-based employee compensation 0.6   0.6      
Stock issued to directors as compensation (in shares)   2,902        
Stock issued to directors as compensation 0.1 $ 0.0 0.1      
Purchases and cancellation of common stock (in shares)   (1,161,812)        
Purchases and cancellation of common stock (52.6) $ (0.1)     (52.5)  
Balance (in shares) at Dec. 31, 2014   30,465,522   0    
Balance at Dec. 31, 2014 489.0 $ 3.0 49.8 $ 0.0 512.7 (76.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 89.7          
Other comprehensive loss, net of tax (64.9)         (64.9)
Dividends declared (46.9)       (46.9)  
Restricted stock issuances, net (in shares)   68,264        
Restricted stock issuances, net 0.0 $ 0.0 0.0      
Stock-based employee compensation expense 3.3   3.3      
Excess tax benefits of stock-based employee compensation 0.5   0.5      
Stock issued to directors as compensation (in shares)   3,728        
Stock issued to directors as compensation 0.1 $ 0.0 0.1      
Purchases and cancellation of common stock (in shares)   (63,365)        
Purchases and cancellation of common stock (2.9) $ 0.0     (2.9)  
Balance (in shares) at Dec. 31, 2015   30,474,149.000000   0    
Balance at Dec. 31, 2015 $ 467.9 $ 3.0 $ 53.7 $ 0.0 $ 552.6 $ (141.4)