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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Selected Financial Impact of Share-based Compensation The following is a summary of share-based compensation costs and related tax benefits recorded in our consolidated statements of income:
(in thousands)For the Years Ended December 31,
202020192018
   
Share-based compensation expense included in cost of revenue$3,415 $2,681 $2,816 
Share-based compensation expense included in operating expenses27,536 36,597 22,341 
Total share-based compensation expense included in consolidated statements of income30,951 39,278 25,157 
Income tax benefit resulting from share-based compensation expense(3,965)(4,861)(4,190)
Net share-based compensation expense included in consolidated statements of income, excluding tax benefit from settlement of share-based awards26,986 34,417 20,967 
Income tax benefit resulting from settlement of share-based awards(38,981)(19,140)(21,496)
Net expense (benefit) related to share-based compensation arrangements included in consolidated statements of income$(11,995)$15,277 $(529)
Schedule of Weighted Averages of the Assumptions Used in Estimating the Fair Value of Stock Option Awards The weighted averages of the valuation assumptions used to determine the fair value of each option award on the date of grant and the weighted average estimated fair values were as follows:
For the Years Ended December 31,
202020192018
   
Share price at grant$291.14 $218.66 $179.56 
Share exercise price$291.14 $220.88 $179.56 
Expected stock price volatility27 %26 %24 %
Expected term, in years6.06.05.8
Risk-free interest rate1.4 %2.4 %2.7 %
Weighted average fair value of options granted$84.92 $65.53 $52.99 
Schedule of Stock Option Activity A summary of the status of options granted under our share-based compensation plans at December 31, 2020, and changes during the year then ended, are presented in the table below:
Number of Options (000)Weighted Average Exercise PriceWeighted Average Remaining Contractual TermAggregate Intrinsic Value ($000)
    
Outstanding as of December 31, 20192,311 $117.13 
Granted220 $291.14 
Exercised(562)$71.65 
Forfeited(16)$180.78 
Outstanding as of December 31, 20201,953 $149.32 6.3$684,571 
Fully vested as of December 31, 20201,057 $106.91 5.3$415,229 
Fully vested and expected to vest as of December 31, 20201,933 $148.61 6.3$678,994 
Schedule of Restricted Stock Unit Activity A summary of the status of RSUs and PBRSUs granted under our share-based compensation plans at December 31, 2020, and changes during the period then ended, are presented in the table below:
Number of Units (000)Weighted Average Grant-Date Fair Value
  
Nonvested as of December 31, 2019258 $150.50 
Granted65 $291.30 
Vested(94)$124.60 
Forfeited(11)$178.95 
Nonvested as of December 31, 2020218 $202.47 
Expected to vest as of December 31, 2020208 $201.64