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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock Issued [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance (in shares) at Dec. 31, 2014   30,465,522      
Balance at Dec. 31, 2014 $ 489.0 $ 3.0 $ 49.8 $ 512.7 $ (76.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 89.7     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    
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net     0.5    
Excess tax deficit of stock-based employee compensation 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 (2.9)        
Purchases and cancellation of common stock (in shares)   (63,365)      
Purchases and cancellation of common stock   $ 0.0   (2.9)  
Balance (in shares) at Dec. 31, 2015   30,474,149      
Balance at Dec. 31, 2015 467.9 $ 3.0 53.7 552.6 (141.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 82.8     82.8  
Other comprehensive loss, net of tax 2.1       2.1
Dividends declared (49.4)     (49.4)  
Restricted stock issuances, net (in shares)   84,105      
Restricted stock issuances, net 0.1 $ 0.1 0.0    
Stock-based employee compensation expense 5.5   5.5    
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation (0.2)   (0.2)    
Stock issued to directors as compensation (in shares)   6,585      
Stock issued to directors as compensation 0.2 $ 0.0 0.2    
Purchases and cancellation of common stock (in shares)   (20,345)      
Purchases and cancellation of common stock (0.7) $ 0.0   (0.7)  
Balance (in shares) at Dec. 31, 2016   30,544,494      
Balance at Dec. 31, 2016 508.3 $ 3.1 59.2 585.3 (139.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 34.5     34.5  
Other comprehensive loss, net of tax 49.9       49.9
Dividends declared (51.9)     (51.9)  
Restricted stock issuances, net (in shares)   186,867      
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Stock-based employee compensation expense 6.9   6.9    
Stock issued to directors as compensation (in shares)   5,798      
Stock issued to directors as compensation 0.2 $ 0.0 0.2    
Purchases and cancellation of common stock (in shares)   (25,860)      
Purchases and cancellation of common stock (1.2) $ 0.0   (1.2)  
Balance (in shares) at Dec. 31, 2017   30,711,299      
Balance at Dec. 31, 2017 $ 546.7 $ 3.1 $ 66.3 $ 566.7 $ (89.4)