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Stock Based Compensation Plans
6 Months Ended
Jun. 30, 2014
Stock Based Compensation Plans
6. Stock Based Compensation Plans

The following table provides a summary of option activity during the six months ended June 30, 2014:

 

     Options     Weighted-
Average
Exercise
Price
     Weighted-
Average
Remaining
Contractual
Term
     Aggregate
Intrinsic
Value
 

Outstanding at December 31, 2013

     8.8      $ 39.47         

Granted

     1.1        69.60         

Exercised

     (0.8     22.20         

Cancelled

     (0.1     54.81         
  

 

 

   

 

 

       

Outstanding at June 30, 2014

     9.0      $ 44.62         6.4       $ 227.9   
  

 

 

   

 

 

    

 

 

    

 

 

 

Exercisable at June 30, 2014

     4.7      $ 29.90         4.5       $ 189.1   
  

 

 

   

 

 

    

 

 

    

 

 

 

The following table provides information regarding the intrinsic value of stock options exercised and stock compensation expense related to stock option awards.

 

     Three Months Ended      Six Months Ended  
     June 30,
2014
     June 30,
2013
     June 30,
2014
     June 30,
2013
 

Intrinsic Value of Stock Options Exercised

   $ 20.9       $ 14.5       $ 37.2       $ 25.9   

Stock Compensation Expense Related to Stock Option Awards

   $ 9.7       $ 9.8       $ 11.8       $ 11.4   

Issued Stock Options

     1.1         1.6         1.1         1.6   

Weighted Average Fair Value of Stock Options issued (per share)

   $ 12.84       $ 10.90       $ 12.84       $ 10.90   

Fair Value of Stock Options Issued

   $ 14.6       $ 17.3       $ 14.6       $ 17.3   

The following table provides a summary of the assumptions used in the valuation of issued stock options:

 

     Three Months Ended     Six Months Ended  
     June 30,
2014
    June 30,
2013
    June 30,
2014
    June 30,
2013
 

Risk-free interest rate

     2.0     1.4     2.0     1.4

Expected life in Years

     6.2        6.2        6.2        6.2   

Expected volatility

     20.4     21.2     20.4     21.2

Dividend Yield

     1.8     1.8     1.8     1.8

The fair value of stock options is based upon the Black Scholes option pricing model. The Company determined the stock options’ lives based on historical exercise behavior and their expected volatility and dividend yield based on the historical changes in stock price and dividend payments. The risk free interest rate is based on the yield of an applicable term Treasury instrument.