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Share-based Compensation - Schedule of Stock Option Activity (Details) - Stock options
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Number of Shares  
Outstanding at the beginning of the period (in shares) | shares 14,773,412
Granted (in shares) | shares 2,269,830
Exercised (in shares) | shares (1,087,815)
Forfeited (in shares) | shares (924,343)
Expired (in shares) | shares (178,627)
Outstanding at the end of the period (in shares) | shares 14,852,457
Exercisable at the end of the period (in shares) | shares 10,506,897
Weighted Average Exercise Price  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 36.64
Granted (in dollars per share) | $ / shares 61.45
Exercised (in dollars per share) | $ / shares 19.19
Forfeited (in dollars per share) | $ / shares 51.88
Expired (in dollars per share) | $ / shares 59.83
Outstanding at the end of the period (in dollars per share) | $ / shares 40.48
Exercisable at the end of the period (in dollars per share) | $ / shares $ 34.26