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Stock-Based Compensation (Details 3) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Options
     
Stock-Based Compensation      
Weighted-average fair value per share of options granted (in dollars per share) $ 4.03 $ 5.04 $ 4.61
Fair value assumptions:      
Expected dividend yield (as a percent) 1.86% 1.70% 1.73%
Expected stock price volatility (as a percent) 46.50% 44.20% 44.40%
Risk-free interest rate (as a percent) 1.17% 2.24% 2.65%
Expected term 5 years 3 months 18 days 5 years 3 months 18 days 5 years 3 months 18 days
Other information      
Vesting period 3 years    
Total fair value of options vested $ 0.7    
Nonvested Options, Shares      
Beginning of the period (in shares) 333 294  
Granted (in shares) 190    
Vested (in shares) (151)    
End of the period (in shares) 333 294  
Nonvested Options, Weighted-Average Grant Date Fair Value      
Beginning of the period (in dollars per share) $ 4.40 $ 4.71  
Granted (in dollars per share) $ 4.03 $ 5.04 $ 4.61
Vested (in dollars per share) $ 4.54    
End of the period (in dollars per share) $ 4.40 $ 4.71  
Additional information      
Compensation expense yet to be recognized 0.6    
Weighted-average period over which compensation cost will be recognized 1 year 9 months 18 days    
Stock Options | Minimum
     
Other information      
Sum of age and years of service for accelerated vesting on retirement of certain stock options and restricted stock awards 75 years    
Restricted Stock and Restricted Stock Units
     
Shares      
Beginning of the period (in shares) 302 312 300
Granted (in shares) 224 231 245
Vested (in shares) (254) (241) (228)
Forfeited (in shares)     (5)
End of the period (in shares) 272 302 312
Additional information      
Compensation expense yet to be recognized 1.1    
Weighted-average period over which compensation cost will be recognized 9 months 18 days    
Fair value of shares vested 3.0    
Weighted-average fair value (in dollars per share) $ 10.78 $ 11.29 $ 12.26
Aggregate intrinsic value of stock vested $ 3.1 $ 2.6 $ 3.0
Restricted Stock and Restricted Stock Units | Minimum
     
Other information      
Sum of age and years of service for accelerated vesting on retirement of certain stock options and restricted stock awards     75 years
Performance Stock Units
     
Other information      
Vesting period 3 years