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Stock-based compensation plans (Tables)
12 Months Ended
Dec. 31, 2011
Stock-based compensation [Abstract]  
Summary of restricted stock and restricted stock unit activity

A summary of restricted stock and restricted stock unit activity follows:

 

                                 
    Restricted
Stock Units
Outstanding
    Weighted-
Average
Grant Price
    Restricted
Stock
Outstanding
    Weighted-
Average
Grant Price
 

Unvested at January 1, 2011

    719,976     $ 49.99       965,072     $ 52.81  

Granted

    242,282       86.35       451,248       85.03  

Vested

    (148,189     46.17       (290,034     61.50  

Cancelled

    (12,606     73.73       (34,921     64.37  
   

 

 

   

 

 

   

 

 

   

 

 

 

Unvested at December 31, 2011

    801,463     $ 61.31       1,091,365     $ 63.45  
   

 

 

   

 

 

   

 

 

   

 

 

 
Summary of stock option activity

A summary of stock option activity follows:

 

                                 
    Stock
Options
Outstanding
    Weighted-Average     Aggregate
Intrinsic Value
(In thousands)
 
    Exercise
Price
    Life
(In Years)
   

Outstanding at January 1, 2011

    10,578,415     $ 97.35                  

Granted

    100       86.47                  

Exercised

    (449,022     70.76                  

Cancelled

    (22,483     91.80                  

Expired

    (267,062     104.89                  
   

 

 

   

 

 

                 

Outstanding at December 31, 2011

    9,839,948     $ 98.37       3.8     $ 3,075  
   

 

 

   

 

 

   

 

 

   

 

 

 

Exercisable at December 31, 2011

    8,775,638     $ 99.50       3.5     $ 1,497