Annual report pursuant to Section 13 and 15(d)

Employee Stock Plans - Weighted Average Fair Value Of Stock Options (Details)

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Employee Stock Plans - Weighted Average Fair Value Of Stock Options (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Fair Value of Stock Grants Using Black-Scholes Valuation Model [Abstract]      
Weighted average fair value of stock options with an exercise price equal to the market price on the grant date (in USD per share) $ 23.64 $ 84.55 $ 47.17
Weighted average fair value of stock options with an exercise price greater than the market price on the grant date (in USD per share) 0 0 0
Total (in USD per share) $ 23.64 $ 84.55 $ 47.17