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Condensed Consolidated Statements of Changes in Stockholders' Equity (USD $)
In Millions, except Share data, unless otherwise specified
Total
Common Stock Issued [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2012 $ 511.8 $ 3.1 $ 41.0 $ (0.3) $ 483.4 $ (15.4)
Balance (in shares) at Dec. 31, 2012   31,209,866   8,760    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 85.8       85.8  
Other comprehensive income (loss), net of tax (3.5)         (3.5)
Dividends declared ($0.90 per share in 2013 and $1.08 per share in 2014) (28.3)       (28.3)  
Restricted stock issuances, net 0   (0.2) 0.2    
Restricted stock issuances, net (in shares)   (214,461)   (5,000)    
Stock-based employee compensation expense 2.0   2.0      
Excess tax benefits of stock-based employee compensation 0.5   0.5      
Stock issued to directors as compensation 0.1   0.1      
Stock issued to directors as compensation (in shares)   1,071        
Issuance of shares for options exercised 0.3   0.3      
Issuance of shares for options exercised (in shares)   21,000        
Share cancellation 0   (1.8) 1.8    
Share cancellation (in shares)   (47,218)   (47,218)    
Purchases of treasury stock (1.7)     (1.7)    
Purchases of treasury stock (in shares)       43,458    
Balance at Sep. 30, 2013 567.0 3.1 41.9 0 540.9 (18.9)
Balance (in shares) at Sep. 30, 2013   31,399,180   0    
Balance at Dec. 31, 2013 561.4 3.1 43.3 0 520.0 (5.0)
Balance (in shares) at Dec. 31, 2013   31,423,427   0    
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 ($0.90 per share in 2013 and $1.08 per share in 2014) (33.0)       (33.0)  
Restricted stock issuances, net 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   0.1      
Stock issued to directors as compensation (in shares)   1,996        
Purchases and retirement of common stock (52.6) (0.1)       (52.5)  
Purchases and retirement of common stock (in shares)   (1,161,812)         
Balance at Sep. 30, 2014 $ 520.9 $ 3.0 $ 48.3 $ 0 $ 505.7 $ (36.1)
Balance (in shares) at Sep. 30, 2014   30,461,791   0