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Shareholders' Equity Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Class of Stock [Line Items]        
Repurchase and retirement of common stock   $ 111.4 $ 172.3 $ 410.5
Number of shares authorized to be repurchased (in shares) 681.7   681.7  
Cash dividend paid during period, per share (in dollars per share) $ 0.64 $ 0.63 $ 1.28 $ 1.26
Common stock excluded from calculation of diluted earnings per share (shares)   0.6 1.6 0.8
Common Stock        
Class of Stock [Line Items]        
Repurchase and retirement of common stock (shares)   0.8 1.5 3.3