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Share-based compensation plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
DecimalType
Jun. 30, 2012
Jul. 12, 2012
Share-based compensation plans [Abstract]      
Number of shares underlying options 207,000    
Weighted-average exercise price per share $ 22.39 $ 22.39 $ 22.57
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected dividend yield - weighted average 1.80%    
Expected dividend yield - range  1.8    
Expected volatility - weighted average 40.00%    
Expected volatility range - maximum 40.00%    
Risk-free interest rate - weighted average 0.70%    
Risk-free interest rate range - minimum 0.50%    
Risk-free interest rate range - maximum 0.90%    
Expected term in years - weighted average 4.25    
Expected term in years range - minimum 3.25    
Expected term in years range - maximum 5.25    
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Aggregate Weighted Average Grant Date Fair Value $ 1.3    
Weighted-average fair value estimates at grant date $ 6.29    
Nonvested share activity [Line Items]      
Beginning balance - shares   315,400  
Stock units granted - shares   98,100  
Cancelled awards - shares   (100)  
Vested - shares   (42,100)  
Ending balance - shares 371,300 371,300  
2005 Equity Incentive Plan
     
Nonvested share activity [Line Items]      
Beginning balance - shares   299,600  
Stock units granted - shares   98,100  
Cancelled awards - shares   (100)  
Vested - shares   (42,100)  
Ending balance - shares 355,500 355,500  
Weighted-average grant-date fair value [Abstract]      
Beginning Balance - grant-date fair value   $ 25.99  
Stock units granted - grant-date fair value   $ 22.98  
Cancelled awards - grant-date fair value $ 26.40 $ 26.40  
Vested - grant-date fair value   $ 25.50  
Ending Balance - grant-date fair value $ 25.26 $ 25.26  
Non-Employee Directors' Equity Plan
     
Nonvested share activity [Line Items]      
Beginning balance - shares   15,800  
Stock units granted - shares   0  
Cancelled awards - shares   0  
Vested - shares   0  
Ending balance - shares 15,800 15,800  
Weighted-average grant-date fair value [Abstract]      
Beginning Balance - grant-date fair value   $ 25.99  
Stock units granted - grant-date fair value   $ 22.98  
Cancelled awards - grant-date fair value $ 26.40 $ 26.40  
Vested - grant-date fair value   $ 25.50  
Ending Balance - grant-date fair value $ 25.26 $ 25.26