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SHAREHOLDERS' EQUITY (Tables)
12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Number of Reserved and Authorized Shares Under the Equity Incentive Plans
As of December 31, 2020, the number of Reserved and Authorized Shares under the Equity Incentive Plans is as detailed below:
 
    
  2020  
      
        
 
Stock Options outstanding
  
 
 
 
9.4
 
 
 
RSU outstanding
  
 
1.7
 
 
PSU outstanding
 
*
 
Ordinary shares available for issuance under the Equity Incentive Plans
  
 
3.7
 
 
  
 
 
 
 
 
Total Reserved and Authorized Shares as of December 31, 2020
  
 
 
 
14.8
 
 
 
  
 
 
 
 
*) Represents an amount lower than
 
0.1
Summary of Stock Option Activity and Related Information
A summary of the Company’s stock option activity and related information is as follows:
 
    
  Options  
   
  Weighted  
average
exercise
price
    
  Aggregate  
intrinsic
value
 
    
2020
 
Outstanding at beginning of year
  
 
10.7
 
  
$
101.57
 
  
$
122.4  
Granted
  
 
1.1
 
  
$
111.81
 
  
 
 
 
Exercised
  
 
(2.3
  
$
83.80
 
  
 
 
 
Forfeited
  
 
(0.1
  
$
110.30
 
  
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Outstanding at December 31, 2020
  
 
9.4
 
  
$
106.99
 
  
$
244.3  
  
 
 
   
 
 
    
 
 
 
Exercisable at December 31, 2020
  
 
5.5
 
  
$
102.90
 
  
$
164.1  
    
 
 
    
 
 
    
 
 
 
Summary of Restricted Stock Units Activity
A summary of the Company’s RSUs activity is as follows:
 
    
Year ended

  December 31,  
 
    
2020
 
Unvested at beginning of year
     1.4  
Granted
     0.9  
Vested
    
(0.5
Forfeited
     (0.1
  
 
 
 
Unvested, December 31, 2020
     1.7  
  
 
 
 
Stock-based Compensation Expense Related to Stock Options, RSUs and PSUs
Stock-based compensation expense related to stock options, RSUs and PSUs is included in the consolidated statements of income as follows:
 
    
Year ended

December 31,
    
2020
  
2019
  
2018
Cost of revenues
  
$
4.5
 
  
$
4.4
 
  
$
3.6
 
Research and development
  
 
23.5
 
  
 
18.9
 
  
 
17.6
 
Selling and marketing
  
 
36.8
 
  
 
28.8
 
  
 
20.8
 
General and administrative
  
 
47.7
 
  
 
54.6
 
  
 
47.3
 
  
 
 
 
  
 
 
 
  
 
 
 
 
  
  $     112.5
 
  
  $     106.7
 
  
  $     89.3