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Share-Based Compensation - Summary of Term-Based Option Activity (Detail) - Term Based Stock Options [Member] - Share Based Compensation Plans [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Shares    
Options Outstanding at Beginning of Period 13,549,769  
Options, Granted 4,112,295  
Options, Exercised (1,186,362)  
Options, Forfeited or expired (45,530)  
Options Outstanding at End of Period 16,430,172 13,549,769
Options Exercisable at End of Period 4,960,532  
Weighted Average Exercise Price (per share)    
Weighted Average Exercise Price at Beginning of Period $ 19.28  
Weighted Average Exercise Price, Granted 49.66  
Weighted Average Exercise Price, Exercised (16.69)  
Weighted Average Exercise Price, Forfeited or expired (21.22)  
Weighted Average Exercise Price at End of Period 26.83 $ 19.28
Weighted Average Exercise Price Exercisable at End of Period $ 16.84  
Weighted Average Remaining Contractual Term (in years)    
Weighted Average Remaining Contractual Term (in years) 8 years 1 month 6 days 7 years 6 months
Weighted Average Remaining Contractual Term Exercisable (in years) 5 years 7 months 6 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Options Outstanding $ 402.1 $ 206.8
Aggregate Intrinsic Value, Options Exercisable $ 170.9