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Goodwill and Identifiable Intangible Assets - Change in Net Carrying Amount of Goodwill by Segment (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Goodwill [Line Items]  
Beginning Balance $ 2,394.8 [1]
Translation adjustments 1.4
Acquisition-related adjustments 70.4
Ending Balance 2,466.6 [1]
Plumbing [Member]  
Goodwill [Line Items]  
Beginning Balance 750.1 [1]
Translation adjustments 0.8
Acquisition-related adjustments 65.5
Ending Balance 816.4 [1]
Outdoors & Security [Member]  
Goodwill [Line Items]  
Beginning Balance 718.6 [1]
Translation adjustments 0.2
Acquisition-related adjustments 4.9
Ending Balance 723.7 [1]
Cabinets [Member]  
Goodwill [Line Items]  
Beginning Balance 926.1 [1]
Translation adjustments 0.4
Ending Balance $ 926.5 [1]
[1] Net of accumulated impairment losses of $399.5 million in the Outdoors & Security segment.