Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Summary of Activities Under Share-Based Compensation Plans (Detail)

v3.19.3.a.u2
Share-Based Compensation - Summary of Activities Under Share-Based Compensation Plans (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding and nonvested as of December 31, 2018, Number of Shares 1,611  
Granted, Number of Shares 983  
Vested, Number of Shares (241)  
Forfeited, Number of Shares (520)  
Outstanding and nonvested as of December 31, 2019, Shares 1,833 1,611
Number of Shares, Expected to vest as of December 31, 2019 1,575  
Outstanding and nonvested as of December 31, 2018, Weighted Average Grant Date Fair Value Per Share $ 42.09  
Granted, Weighted Average Grant Date Fair Value Per Share 55.23  
Vested, Weighted Average Grant Date Fair Value Per Share 43.49  
Forfeited, Weighted Average Grant Date Fair Value Per Share 40.23  
Outstanding and nonvested as of December 31, 2019, Weighted Average Grant Date Fair Value Per Share 49.49 $ 42.09
Expected to vest as of December 31, 2019, Weighted Average Grant Date Fair Value Per Share $ 49.18  
SARs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Awards Outstanding, Beginning Balance 8,470  
Exercised, Number of Awards (1,202)  
Forfeited, Number of Awards (267)  
Number of Awards Outstanding, Ending Balance 7,001 8,470
Number of Awards Exercisable, Ending Balance 5,755  
Number of Awards Vested and expected to vest, Ending Balance 7,000  
Weighted Average Exercise Price Per Award Outstanding, Beginning Balance $ 26.82  
Exercised, Weighted Average Exercise Price Per Award 20.12  
Forfeited, Weighted Average Exercise Price Per Award 29.93  
Weighted Average Exercise Price Per Award Outstanding, Ending Balance 27.85 $ 26.82
Exercisable, Weighted Average Exercise Price Per Award, Ending Balance 27.68  
Weighted Average Exercise Price Per Award, Vested and expected to vest, Ending Balance $ 27.85  
Weighted Average Remaining Contractual Term Outstanding 5 years 4 months 24 days 6 years 1 month 6 days
Exercisable Weighted Average Remaining Contractual Term 5 years  
Weighted Average Remaining Contractual Term, Vested and expected to vest 5 years 4 months 24 days  
Aggregate Intrinsic Value Outstanding $ 138.7 $ 272.1
Exercisable, Aggregate Intrinsic Value 115.0  
Aggregate Intrinsic Value, Vested and expected to vest $ 138.7