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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 25, 2010
Dec. 26, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for the stock incentive plan (in shares) 746,000   750,000
Stock-based compensation expense $ 3.5 $ 2.9 $ 2.6
Related tax benefit to stock based compensation 0.9 0.7 0.6
Weighted average exercise price [Roll Forward]      
Stock option compensation not yet recognized 0    
Average stock option expense recognition period 0    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock awards outstanding (in shares) 229,000 132,000  
Granted (in shares) 132,000    
Vested (in shares) 35,000    
Aggregate intrinsic value 7.4    
Compensation for stock awards not yet recognized 5.7    
Compensation recognition period (in years) 4    
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation for stock awards not yet recognized 8.5    
Compensation recognition period (in years) 3.4    
Stock options vesting period (in years) 5Y    
Number of years vesting starts after the grant date (in years) 1Y    
Stock options expirations (in years) 10    
Weighted average grant-date fair value of options granted (in dollars per share) $ 12.53 $ 7.63 $ 7.60
Estimated forfeiture rate (in hundredths) 17.00% 17.00% 17.00%
Weighted average key assumptions [Abstract]      
Expected term (in years) 6.3 6.3 6.3
Expected price volatility 35.80% 35.30% 33.40%
Risk-free interest rate (in hundredths) 1.70% 2.40% 3.30%
Dividend yield (in hundredths) 1.10% 1.60% 1.70%
Options outstanding [Roll Forward]      
Beginning balance (in shares) 1,665 1,604 2,084
Granted (in shares) 31 233 226
Exercised (in shares) (464) (148) (477)
Cancelled (in shares)     (80)
Expired (in shares)   (24) (149)
Ending balance (in shares) 1,232 1,665 1,604
Weighted average exercise price [Roll Forward]      
Beginning balance (in dollars per share) $ 27.85 $ 27.56 $ 26.43
Granted (in dollars per share) $ 37.54 $ 24.70 $ 23.79
Exercised (in dollars per share) $ 27.91 $ 19.26 $ 19.16
Cancelled (in dollars per share)     $ 28.42
Expired (in dollars per share)   $ 30.78 $ 32.50
Ending balance (in dollars per share) $ 28.07 $ 27.85 $ 27.56
Aggregate intrinsic value of all outstanding options 13.2    
Weighted average remaining contractual term of all outstanding options (in years) 5.8    
Outstanding options, exercisable (in shares) 747,000    
Aggregate intrinsic value of current exercisable shares 7.3    
Weighted average exercise price (in dollars per share) $ 29.07    
Weighted average remaining contractual term (in years) 4.6    
Total intrinsic value of options exercised $ 6.6 $ 1.3 $ 1.4