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Goodwill and Identifiable Intangible Assets - Change in Net Carrying Amount of Goodwill by Segment (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Goodwill [Line Items]  
Beginning Balance $ 2,394.8 [1]
Translation adjustments 2.8
Acquisition-related adjustments 68.6
Ending Balance 2,466.2 [1]
Plumbing [Member]  
Goodwill [Line Items]  
Beginning Balance 750.1 [1]
Translation adjustments 1.8
Acquisition-related adjustments 65.4
Ending Balance 817.3 [1]
Outdoors & Security [Member]  
Goodwill [Line Items]  
Beginning Balance 718.6 [1]
Translation adjustments 0.3
Acquisition-related adjustments 3.2
Ending Balance 722.1 [1]
Cabinets [Member]  
Goodwill [Line Items]  
Beginning Balance 926.1 [1]
Translation adjustments 0.7
Ending Balance $ 926.8 [1]
[1] Net of accumulated impairment losses of $399.5 million in the Outdoors & Security segment.