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Earnings Per Share - Computations of Earnings (Loss) per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]    
Net income $ 180.9 $ 177.8
Basic earnings per common share $ 1.36 $ 1.28
Diluted earnings per common share $ 1.34 $ 1.26
Basic average shares outstanding 133.4 138.6
Stock-based awards 1.3 2.0
Diluted average shares outstanding 134.7 140.6
Antidilutive stock-based awards excluded from weighted- average number of shares outstanding for diluted earnings per share 0.4 0.2