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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of weighted average assumptions used for options granted
The following weighted average assumptions were used for options granted:
 Years Ended December 31,
 202120202019
Expected life (in years)5.05.06.0
Expected volatility26.1 %27.0 %26.6 %
Risk-free interest rate1.0 %0.4 %1.8 %
Expected forfeiture rate— %— %— %
Summarizes restricted stock unit and performance share activity
The following table summarizes restricted stock unit and performance stock unit activity during the periods presented (shares in thousands):
 Number of SharesWeighted Average Grant Date Fair Value per Share
Unvested at December 31, 2020587 282.45 
Granted197 458.79 
Conversion of Unvested Restricted Stock Awards44 451.99 
Vested(205)276.93 
Forfeited(23)330.75 
Unvested at December 31, 2021
600 $355.43 
Summary of stock option activity
Options granted, exercised, forfeited and expired are summarized as follows:
 Number of
Shares		Weighted
Average Exercise
Price		Weighted
Average
Remaining
Contractual Life
(Years)		Aggregate
Intrinsic Value
Outstanding at December 31, 20202,177 181.63   
Granted87 451.94   
Exercised(627)154.26   
Forfeited(17)202.55   
Outstanding at December 31, 20211,620 $206.06 6$537,547 
Exercisable at December 31, 20211,178 $173.51 5$429,336 
Other information pertaining to option activity was as follows during the twelve months ended December 31:
 202120202019
Weighted average grant-date fair value of stock options granted$113.18 $98.69 $74.54 
Total intrinsic value of stock options exercised$215,062 $292,394 $155,899 
Summary of share-based compensation expense related to share-based awards
The following table summarizes share-based compensation expense related to share-based awards which is recorded in the consolidated statements of comprehensive income:
 Years Ended December 31,
 202120202019
Cost of subscriptions, software services and maintenance $23,705 $18,125 $15,002 
Selling, general and administrative expenses81,021 49,240 44,965 
Total share-based compensation expenses104,726 67,365 59,967 
Excess tax benefit(47,675)(60,190)(29,819)
Net decrease in net income$57,051 $7,175 $30,148