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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 71.2     71.2  
Other comprehensive income (loss), net of tax (31.1)       (31.1)
Dividends declared ($1.08 per share in 2014 and $1.14 per share in 2015) (33.0)     (33.0)  
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Restricted stock issuances, net (in shares)   198,180      
Stock-based employee compensation expense 4.3   4.3    
Excess tax benefits of stock-based employee compensation 0.6   0.6    
Stock issued to directors as compensation 0.1 $ 0.0 0.1    
Stock Repurchased and Retired During Period, Shares   1,161,812      
Stock issued to directors as compensation (in shares)   1,996      
Purchases and retirement of common stock (52.6) $ (0.1)   (52.5)  
Balance at Sep. 30, 2014 520.9 $ 3.0 48.3 505.7 (36.1)
Balance (in shares) at Sep. 30, 2014   30,461,791      
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 68.0     68.0  
Other comprehensive income (loss), net of tax (61.7)       (61.7)
Dividends declared ($1.08 per share in 2014 and $1.14 per share in 2015) (34.7)     (34.7)  
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Restricted stock issuances, net (in shares)   70,949      
Stock-based employee compensation expense 1.7   1.7    
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)   2,638      
Purchases and retirement of common stock (2.9) $ 0.0   (2.9)  
Balance at Sep. 30, 2015 $ 460.0 $ 3.0 $ 52.1 $ 543.1 $ (138.2)
Balance (in shares) at Sep. 30, 2015   30,475,744