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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Summary of Annual Rate of Depreciation on Property and Equipment Depreciation is calculated using the straight-line method over the estimated useful lives of the assets at the following annual rates:
     
 
%
     
Computers and peripheral equipment
 
33 - 50
Office furniture and equipment
 
10 - 20
Building
 
4
Leasehold improvements
 
The shorter of term of the lease or the
useful life of the asset
 
 
 
Schedule of New Accounting Pronouncements and Changes In Accounting Principles
The cumulative effects of the changes made to the Company’s consolidated balance sheet as of January 1, 2018 for the adoption of Topic 606 were as follows:
                         
 
Balance at
December 31, 2017
   
Adjustments
due to Topic 606
   
Balance at
January 1, 2018
 
Other Assets
 
$
33.6
    
$
25.5
    
$
59.1
 
Deferred tax asset, net
 
$
119.4
    
$
(6.4)
    
$
113.0
 
Retained earnings
 
$
8,203.0
    
$
19.1
    
$
8,222.1
 
 
 
 
 
 
 
 
Weighted Average Assumptions Used to Estimate the Fair Value of Employee Stock Purchase Plans
The fair value of options granted and Employee Stock Purchase Plan in 2019, 2018 and 2017 is estimated at the date of grant using the following weighted average assumptions:
                         
 
        Year ended December 31,        
  
Employee Stock Options
 
    2019    
 
  
 
 
 
 
 
 
 
 
    2018    
 
  
 
 
 
 
 
 
 
 
    2017    
 
                         
Expected volatility
   
20.78%
      
21.98%
      
22.20%
  
Risk-free interest rate
   
1.98%
      
2.67%
      
1.71%
  
Dividend yield
   
0.0%
      
0.0%
      
0.0%
  
Expected term (years)
   
4.11
     
5.13
     
4.76
 
                   
Employee Stock Purchase Plan
 
 
  
 
 
 
 
 
 
 
 
 
                         
Expected volatility
   
18.59%
      
22.88%
      
18.21%
  
Risk-free interest rate
   
0.8%
      
1.07%
      
0.50%
  
Dividend yield
   
0.0%
      
0.0%
      
0.0%
  
Expected term (years)
   
0.5
     
0.5
     
0.5
 
 
 
 
 
 
 
 
 
 
Components of Accumulated Other Comprehensive Income (Loss)
The following table shows the components of accumulated other comprehensive
income
(loss), net of taxes, for the year ended December 31, 2019:
                         
 
Year ended December 31, 2019
 
Unrealized
gains (losses)
on 
debt

securities
 
Unrealized
gains (losses)
on cash flow
hedges
 
Total
 
                         
Beginning balance
    $
(24.1
 )     $
(0.4
 )     $
 
 
 
 
 
(24.5
 )
                         
Other comprehensive gain before reclassifications
   
45.8
      
2.2
      
48.0
  
Amounts reclassified from accumulated other comprehensive income
   
*(0.6
 )    
        **(1.2
 )    
(1.8
 )
                         
                         
Net current-period other comprehensive gain
   
45.2
      
1.0
      
46.2
  
                         
                         
Ending balance
    $
21.1
       $
0.6
       $
21.7
  
                         
 
  *) The reclassification out of accumulated other comprehensive income during the year ended December 31, 2019 for realized losses on marketable securities are included within financial income, net.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  **) The reclassification out of accumulated other comprehensive income during the year ended December 31, 2019 for realized gains on cash flow hedges are included mostly within research and development expenses as well as other operating expenses.