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Share-based Payments - Schedule of Activity in Stock Options Outstanding and Related Information (Details)
 12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Disclosure Of Share Based Payments [Abstract]      
Number of options outstanding, beginning balance | shares 12,153,772 12,243,526 14,646,720
Number of options granted | shares 2,356,040 4,152,565 3,578,000
Number of options forfeited | shares (855,051) (719,860) (1,220,508)
Number of options exercised | shares (4,556,908) (3,478,660) (4,736,555)
Number of options expired | shares (56,565) (43,799) (24,131)
Number of options outstanding, ending balance | shares 9,041,288 12,153,772 12,243,526
Number of options, Exercisable | shares 4,022,751 5,553,650 5,162,876
Weighted average exercise price outstanding, beginning balance | $ / shares $ 107.68 $ 77.63 $ 48.73
Weighted average exercise price granted | $ / shares 180.12 147.11 142.20
Weighted average exercise price forfeited | $ / shares 131.30 105.01 62.82
Weighted average exercise price exercised | $ / shares 78.87 49.41 40.97
Weighted average exercise price expired | $ / shares 146.69 117.79 54.98
Weighted average exercise price outstanding, ending balance | $ / shares 138.60 107.68 77.63
Weighted average exercise price, Exercisable | $ / shares $ 113.91 $ 84.18 $ 58.25