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Computation of Basic and Diluted Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net income $ 815.6 $ 846.6 $ 825.7
Weighted average ordinary shares outstanding 133.1 140.5 150.6
Employee stock options, RSUs and PSUs 1.0 1.5 1.5
Diluted weighted average ordinary shares outstanding 134.1 142.0 152.1
Basic earnings per ordinary share $ 6.13 $ 6.03 $ 5.48
Diluted earnings per ordinary share $ 6.08 $ 5.96 $ 5.43