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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
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Shares    
Options Outstanding at Beginning of Period 10,994,181  
Options, Granted 5,140,787  
Options, Exercised (1,127,360)  
Options, Forfeited or expired (166,747)  
Options Outstanding at End of Period 14,840,861 10,994,181
Options Exercisable at End of Period 6,868,950  
Weighted Average Exercise Price (per share)    
Weighted Average Exercise Price at Beginning of Period $ 16.52  
Weighted Average Exercise Price, Granted 22.84  
Weighted Average Exercise Price, Exercised (13.73)  
Weighted Average Exercise Price, Forfeited or expired (17.09)  
Weighted Average Exercise Price at End of Period 18.66 $ 16.52
Weighted Average Exercise Price Exercisable at End of Period $ 16.70  
Weighted Average Remaining Contractual Term (in years)    
Weighted Average Remaining Contractual Term (in years) 7 years 7 months 6 days 6 years 10 months 24 days
Weighted Average Remaining Contractual Term Exercisable (in years) 5 years 9 months 18 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Options Outstanding $ 346.8 $ 48.8
Aggregate Intrinsic Value, Options Exercisable $ 174.0