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Condensed 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 Loss [Member]
Balance at Dec. 31, 2013 $ 561.4 $ 3.1 $ 43.3 $ 520.0 $ (5.0)
Balance (in shares) at Dec. 31, 2013   31,423,427      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 48.2     48.2  
Other comprehensive income (loss), net of tax 6.5       6.5
Dividends declared ($0.72 per share in 2014 and $0.76 per share in 2015) (22.0)     (22.0)  
Restricted stock issuances, net 0.0   0.0    
Restricted stock issuances, net (in shares)   198,180      
Stock-based employee compensation expense 3.0   3.0    
Excess tax benefits of stock-based employee compensation 0.6   0.6    
Stock issued to directors as compensation 0.0 $ 0.0 0.0    
Stock Repurchased and Retired During Period, Shares   1,161,812      
Stock issued to directors as compensation (in shares)   1,138      
Purchases and retirement of common stock (52.6) $ (0.1)   (52.5)  
Balance at Jun. 30, 2014 545.1 $ 3.0 46.9 493.7 1.5
Balance (in shares) at Jun. 30, 2014   30,460,933      
Balance at Dec. 31, 2014 489.0 $ 3.0 49.8 512.7 (76.5)
Balance (in shares) at Dec. 31, 2014   30,465,522      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 42.2     42.2  
Other comprehensive income (loss), net of tax (43.2)       (43.2)
Dividends declared ($0.72 per share in 2014 and $0.76 per share in 2015) (23.1)     (23.1)  
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Restricted stock issuances, net (in shares)   70,449      
Stock-based employee compensation expense 1.5   1.5    
Excess tax benefits of stock-based employee compensation 0.5   0.5    
Stock issued to directors as compensation 0.1 $ 0.0 0.1    
Stock Repurchased and Retired During Period, Shares   63,365      
Stock issued to directors as compensation (in shares)   1,698      
Purchases and retirement of common stock (2.9) $ 0.0   (2.9)  
Balance at Jun. 30, 2015 $ 464.1 $ 3.0 $ 51.9 $ 528.9 $ (119.7)
Balance (in shares) at Jun. 30, 2015   30,474,304