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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net income $ 202.1 $ 165.8 $ 597.1 $ 390.8
Less: Noncontrolling interest   1.2   1.3
Net income attributable to Fortune Brands $ 202.1 $ 164.6 $ 597.1 $ 389.5
Basic earnings per common share $ 1.47 $ 1.19 $ 4.32 $ 2.81
Diluted earnings per common share $ 1.45 $ 1.17 $ 4.26 $ 2.78
Basic average shares outstanding 137.8 138.6 138.3 138.6
Stock-based awards 1.9 1.9 1.9 1.4
Diluted average shares outstanding 139.7 140.5 140.2 140.0
Antidilutive stock-based awards excluded from weighted- average number of shares outstanding for diluted earnings per share 0.4 0.3 0.3 1.1