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Goodwill and Identifiable Intangible Assets - Change in Net Carrying Amount of Goodwill by Segment (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Goodwill [Line Items]  
Beginning Balance $ 2,394.8 [1]
Translation adjustments 5.8
Acquisition-related adjustments 70.0
Ending Balance 2,470.6 [1]
Plumbing [Member]  
Goodwill [Line Items]  
Beginning Balance 750.1 [1]
Translation adjustments 3.5
Acquisition-related adjustments 65.5
Ending Balance 819.1 [1]
Outdoors & Security [Member]  
Goodwill [Line Items]  
Beginning Balance 718.6 [1]
Translation adjustments 0.7
Acquisition-related adjustments 4.5
Ending Balance 723.8 [1]
Cabinets [Member]  
Goodwill [Line Items]  
Beginning Balance 926.1 [1]
Translation adjustments 1.6
Ending Balance $ 927.7 [1]
[1] Net of accumulated impairment losses of $399.5 million in the Outdoors & Security segment.