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Goodwill and Identifiable Intangible Assets - Change in Net Carrying Amount of Goodwill by Segment (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Beginning Balance [1] $ 2,090.2 $ 2,080.3
Translation adjustments 3.7 5.6
Acquisition-related adjustments 300.9 4.3
Ending Balance [1] 2,394.8 2,090.2
Plumbing [Member]    
Goodwill [Line Items]    
Beginning Balance [1] 747.3 743.7
Translation adjustments 2.8 3.6
Ending Balance [1] 750.1 747.3
Cabinets [Member]    
Goodwill [Line Items]    
Beginning Balance [1] 925.5 924.0
Translation adjustments 0.6 1.5
Ending Balance [1] 926.1 925.5
Outdoors & Security [Member]    
Goodwill [Line Items]    
Beginning Balance [1] 417.4 412.6
Translation adjustments 0.3 0.5
Acquisition-related adjustments 300.9 4.3
Ending Balance [1] $ 718.6 $ 417.4
[1] Net of accumulated impairment losses of $399.5 million in the Outdoors & Security segment.