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Shareholders' Equity Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Repurchase and retirement of common stock $ 299.1 $ 48.8
Repurchase and retirement of common stock (shares) 2.5  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 0.1  
Cash dividend paid during period, per share (in dollars per share) $ 0.63 $ 0.62
Common stock excluded from calculation of diluted earnings per share (shares) 1.0 5.2
Omnibus Incentive Plan    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common stock excluded from calculation of diluted earnings per share (shares) 0.7