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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, 2020
Dec. 31, 2019
Shares    
Options Outstanding at Beginning of Period 13,144,937  
Options, Granted 140,447  
Options, Exercised (476,489)  
Options, Forfeited or expired (51,324)  
Options Outstanding at End of Period 12,757,571 13,144,937
Options Exercisable at End of Period 4,668,339  
Weighted Average Exercise Price (per share)    
Weighted Average Exercise Price at Beginning of Period $ 29.74  
Weighted Average Exercise Price, Granted 70.73  
Weighted Average Exercise Price, Exercised (18.84)  
Weighted Average Exercise Price, Forfeited or expired (29.34)  
Weighted Average Exercise Price at End of Period 30.60 $ 29.74
Weighted Average Exercise Price Exercisable at End of Period $ 25.02  
Weighted Average Remaining Contractual Term (in years)    
Weighted Average Remaining Contractual Term (in years) 7 years 7 months 6 days 7 years 9 months 18 days
Weighted Average Remaining Contractual Term Exercisable (in years) 6 years 6 months  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Options Outstanding $ 251.6 $ 501.3
Aggregate Intrinsic Value, Options Exercisable $ 116.9