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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $)
In Millions, except Share data, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2011 $ 475.9 $ 3.8 $ 211.7 $ (132.1) $ 417.0 $ (24.5)
Balance (in Shares) at Dec. 31, 2011   37,587,298   5,220,414    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 63.3       63.3  
Other comprehensive income (loss), net of tax 1.2         1.2
Dividends declared (9.4)       (9.4)  
Restricted stock issuances, net 0   (3.4) 3.4    
Restricted stock issuances, net (in shares)       (137,026)    
Stock-based employee compensation expense 4.5   4.5      
Excess tax benefits of stock-based employee compensation 0.1   0.1      
Stock issued to directors as compensation 0   0      
Stock issued to directors as compensation (in shares)   1,324        
Issuance of shares for options exercised 0.1   0.1      
Issuance of shares for options exercised (in shares)   11,100   0    
Purchases of treasury stock (50.0)     (50.0)    
Purchases of treasury stock (in shares)       1,481,482    
Stockholders' Equity, Other Shares   (6,556,110)        
Stock Issued During Period, Value, Stock Dividend   (0.7)     0.7  
Stock Issued During Period, Value, Treasury Stock Reissued 0   (178.4) 178.4    
Stock Issued During Period, Shares, Treasury Stock Reissued       (6,556,110)    
Balance at Sep. 30, 2012 485.7 3.1 34.6 (0.3) 471.6 (23.3)
Balance (in Shares) at Sep. 30, 2012   31,043,612   8,760    
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 (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      
Stock Repurchased and Retired During Period, Shares   (47,218)   (47,218)    
Treasury Stock, Retired, Cost Method, Amount 0   (1.8) 1.8    
Issuance of shares for options exercised (in shares)   21,000         
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