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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income $ 217.2 $ 116.2 $ 395.0 $ 225.0
Less: Noncontrolling interest   0.4   0.1
Net income attributable to Fortune Brands $ 217.2 $ 115.8 $ 395.0 $ 224.9
Basic earnings per common share $ 1.57 $ 0.84 $ 2.85 $ 1.62
Diluted earnings per common share $ 1.55 $ 0.83 $ 2.81 $ 1.61
Basic average shares outstanding 138.4 138.0 138.5 138.6
Stock-based awards 2.0 0.8 2.0 1.2
Diluted average shares outstanding 140.4 138.8 140.5 139.8
Antidilutive stock-based awards excluded from weighted- average number of shares outstanding for diluted earnings per share 0.4 1.9 0.3 1.4