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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, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income $ 177.8 $ 108.8
Less: Noncontrolling interest   (0.3)
Net income attributable to Fortune Brands $ 177.8 $ 109.1
Basic earnings per common share $ 1.28 $ 0.78
Diluted earnings per common share $ 1.26 $ 0.77
Basic average shares outstanding 138.6 139.3
Stock-based awards 2.0 1.5
Diluted average shares outstanding 140.6 140.8
Antidilutive stock-based awards excluded from weighted- average number of shares outstanding for diluted earnings per share 0.2 0.9