v3.10.0.1
Share-based Payments - Schedule of Activity in Share Options Outstanding and Related Information (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Disclosure Of Share Based Payments [Abstract]      
Number of options outstanding, beginning balance | shares 14,646,720 10,976,480 9,192,120
Number of options granted | shares 3,578,000 5,819,520 6,020,360
Number of options forfeited | shares (1,220,508) (659,000) (512,560)
Number of options exercised | shares (4,736,555) (1,422,520) (3,661,480)
Number of options expired | shares (24,131) (67,760) (61,960)
Number of options outstanding, ending balance | shares 12,243,526 14,646,720 10,976,480
Number of options, Exercisable | shares 5,162,876 5,822,400 3,765,000
Weighted average exercise price outstanding, beginning balance | $ $ 48.73 $ 36.88 $ 22.80
Weighted average exercise price granted | $ 142.20 64.11 41.90
Weighted average exercise price forfeited | $ 62.82 46.34 36.03
Weighted average exercise price exercised | $ 40.97 22.23 10.15
Weighted average exercise price expired | $ 54.98 28.49 20.93
Weighted average exercise price outstanding, ending balance | $ 77.63 48.73 36.88
Weighted average exercise price, Exercisable | $ $ 58.25 $ 39.62 $ 29.98