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Share-Based Compensation - Summary of Term-Based Option Activity (Detail) - Term Based Stock Options [Member] - HCM Share Based Compensation Plans [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Shares    
Options Outstanding at Beginning of Period 10,991,681  
Options, Granted 175,000  
Options, Exercised (17,357)  
Options, Forfeited or expired (41,988)  
Options Outstanding at End of Period 11,107,336 10,991,681
Options Exercisable at End of Period 7,214,169  
Weighted Average Exercise Price (per share)    
Weighted Average Exercise Price at Beginning of Period $ 16.52  
Weighted Average Exercise Price, Granted 20.96  
Weighted Average Exercise Price, Exercised (19.76)  
Weighted Average Exercise Price, Forfeited or expired (17.38)  
Weighted Average Exercise Price at End of Period 16.59 $ 16.52
Weighted Average Exercise Price exercisable at End of Period $ 16.19  
Weighted Average Remaining Contractual Term (in years)    
Weighted Average Remaining Contractual Term (in years) 6 years 8 months 12 days 6 years 10 months 25 days
Weighted Average Remaining Contractual Term Exercisable (in years) 5 years 7 months 6 days  
Aggregate intrinsic value    
Aggregate Intrinsic Value, options outstanding $ 48.5 $ 48.8
Aggregate Intrinsic Value exercisable at End of Period $ 34.4