XML 91 R76.htm IDEA: XBRL DOCUMENT v3.20.4
Share-Based Compensation - Schedule Of Estimated Fair Value Of Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
STOCK OPTION PLANS      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 0.60% 2.00% 2.70%
Expected term (years) 4 years 1 month 6 days 4 years 1 month 6 days 4 years 3 months 18 days
Volatility (percent) 32.00% 30.00% 33.00%
Weighted average fair value at grant date (usd per share) $ 163.01 $ 142.53 $ 146.30
EMPLOYEE STOCK PURCHASE PLAN      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 0.90% 2.10% 2.10%
Expected term (years) 1 year 2 months 12 days 1 year 2 months 12 days 1 year 3 months 18 days
Volatility (percent) 30.00% 29.00% 32.00%
Weighted average fair value at grant date (usd per share) $ 171.87 $ 148.99 $ 135.84
RESTRICTED STOCK UNITS      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value at grant date (usd per share) $ 545.67 $ 541.36 $ 431.11