Annual report pursuant to Section 13 and 15(d)

Employee Stock Plans - Weighted Average Stock Price (Details)

v3.20.4
Employee Stock Plans - Weighted Average Stock Price (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted Average Exercise Prices for Stock Options Exercised [Abstract]      
Weighted average exercise price of stock options with an exercise price equal to the market price on the grant date (in USD per share) $ 87.35    
Weighted average exercise price of stock options with an exercise price greater than the market price on the grant date (in USD per share) 0    
Total weighted average exercise price (in USD per share) $ 87.35 $ 57.41 $ 60.45