v3.19.3.a.u2
Share-based Payments - Schedule of Activity in Stock Options Outstanding and Related Information (Details)
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
shares
$ / shares
Disclosure Of Share Based Payments [Abstract]      
Number of options outstanding, beginning balance | shares 12,243,526 14,646,720 10,976,480
Number of options granted | shares 4,152,565 3,578,000 5,819,520
Number of options forfeited | shares (719,860) (1,220,508) (659,000)
Number of options exercised | shares (3,478,660) (4,736,555) (1,422,520)
Number of options expired | shares (43,799) (24,131) (67,760)
Number of options outstanding, ending balance | shares 12,153,772 12,243,526 14,646,720
Number of options, Exercisable | shares 5,553,650 5,162,876 5,822,400
Weighted average exercise price outstanding, beginning balance | $ / shares $ 77.63 $ 48.73 $ 36.88
Weighted average exercise price granted | $ / shares 147.11 142.20 64.11
Weighted average exercise price forfeited | $ / shares 105.01 62.82 46.34
Weighted average exercise price exercised | $ / shares 49.41 40.97 22.23
Weighted average exercise price expired | $ / shares 117.79 54.98 28.49
Weighted average exercise price outstanding, ending balance | $ / shares 107.68 77.63 48.73
Weighted average exercise price, Exercisable | $ / shares $ 84.18 $ 58.25 $ 39.62